ISIS Multi Topology
Overview
Intermediate System to Intermediate System (ISIS) is a link-state routing protocol commonly used in large-scale service provider networks and enterprise networks. By default, ISIS is in a single topology with no separate Shortest Path First (SPF) process to differentiate between IPv4 and IPv6 topologies. If the topology in IPv6 is different from IPv4, the routing calculation encounters a problem as the routes are evaluated and chosen based on the common topology.
Multi Topology (MT) is a mechanism to run a set of independent IP topologies within a single ISIS domain. This means, both IPv4 and IPv6 have different topologies in the network and two SPF processes are run to find the route to each IPv4 and IPv6 destination independently.
Feature Characteristics
The main characteristics of ISIS Multi Topology are as follows:
• Enables ISIS to maintain separate topologies for IPv4 and IPv6 within the same ISIS area or domain.
• Allows routers in the ISIS area (for Level 1 routing) or domain (for Level 2 routing) to support both IPv4 and IPv6 address families.
• Performs multiple SPF calculations for each configured topology.
• Defines new Type-Length-Value (TLV) encodings called Multi Topology TLV (MT TLV). It is used to advertise the multiple topologies supported by the routers and contains information about the topology, including the ID (MTID), flags, and MT metric.
• MT TLV (229): Capability TLV advertised in Hello packets.
• MT intermediate system TLV (222): Extended TLV that describes the adjacency between nodes once the adjacency is formed.
• MT IPV6 reachability TLV (237): Reachability TLV that gives information on IPv6 routing.
Benefits
The key benefits of ISIS Multi Topology are as follows:
• Enables the ability to make changes to the IPv6 topology without affecting the IPv4 topology, and vice-versa.
• Leverages common adjacency and database tables.
• Provides an independent SPF process for IPv4 and IPv6.
Prerequisites
• To enable ISIS Multi Topology on OcNOS devices, wide metric configuration is mandatory.
• Follow the below configuration steps to prepare the interface for implementation of Multi Topology by enabling single topology on the routers:
Note: In each of the commands, modify the relevant router as R1, R2, R3, R4 or R5, depending on the router being configured.
1. Enter configure mode followed by interface mode on loopback interface.
#configure terminal
R1(config)#int lo
2. Configure the IP address for the interface.
R1(config -if)# ip add 1.1.1.1/32 secondary
R1(config -if)# ipv6 address 1111::11/128
3. Include the interface in the router’s ISIS 1 instance and exit the interface mode.
R1(config -if)# ip router isis 1
R1(config -if)# ipv6 router isis 1
R1(config -if)# exit
4. Enter the interface configuration mode and configure the IP address for the interface.
R1(config)#int xe22
R1(config -if)# ip address 10.1.1.1/24
R1(config -if)# ipv6 address 1001::1/64
5. Include the interface in the router’s ISIS 1 instance and exit the interface mode.
R1(config -if)# ip router isis 1
R1(config -if)# ipv6 router isis 1
R1(config -if)# exit
For Routers R1 and R5, continue the configuration steps as follows:
6. Set the routing process ID as 1 and configure the IS type as level-1.
R1(config)# router isis 1
R1(config-router)# is-type level-1
7. Configure wide metric-style.
R1(config-router)# metric-style wide
8. Enable dynamic host name under ISIS process.
R1(config-router)# dynamic-hostname
9. Enable BFD in all the interfaces.
R1(config-router)# bfd all-interfaces
10. Configure Network Entity Title (NET).
R1(config-router)# net 49.0000.0000.0001.00
11. Commit the candidate configuration to the running configuration.
R1(config-router)# commit
For Routers R2 and R4, use the following configuration steps after you exit the interface mode (step 5 shown above):
1. Enter the interface configuration mode and configure the IP address for the interface.
R2(config)#int xe24
R2(config -if)# ip address 20.1.1.1/24
R2(config -if)# ipv6 address 2001::1/64
2. Include the interface in the router’s ISIS 1 instance and exit the interface mode.
R2(config -if)# ipv6 router isis 1
R2(config -if)# exit
3. Enter the interface configuration mode and configure the IP address for the interface.
R2(config)#int xe23
R2(config -if)# ip address 40.1.1.1/24
R2(config -if)# ipv6 address 4001::1/64
4. Include the interface in the router’s ISIS 1 instance and exit the interface mode.
R2(config -if)# ip router isis 1
R2(config -if)# ipv6 router isis 1
R2(config -if)# exit
5. Set the routing process ID as 1 and configure IS type as level 1.
R2(config)# router isis 1
R2(config-router)# is-type level-1
6. Configure wide metric style.
R2(config-router)# metric-style wide
7. Enable dynamic host name under ISIS process.
R2(config-router)# dynamic-hostname
8. Enable BFD in all the interfaces.
R2(config-router)# bfd all-interfaces
9. Configure Network Entity Title (NET).
R2(config-router)# net 49.0000.0000.0002.00
10. Commit the candidate configuration to the running configuration.
R2(config-router)# commit
For Router R3, follow these configuration steps after you exit the interface mode (step 5 shown above):
1. Enter Interface configuration mode and configure the IP address of the interface.
R3(config)#int xe31/1
R3(config -if)# ip address 50.1.1.1/24
R3(config -if)# ipv6 address 5001::1/64
2. Include the interface in the router’s ISIS 1 instance and exit the interface mode.
R3(config -if)# ip router isis 1
R3(config -if)# ipv6 router isis 1
R3(config -if)# exit
3. Set the routing process ID as 1 and configure IS type as level-1.
R3(config)# router isis 1
R3(config-router)# is-type level-1
4. Configure wide metric-style.
R3(config-router)# metric-style wide
5. Enable dynamic host name under ISIS process.
R3(config-router)# dynamic-hostname
6. Enable BFD on all the interfaces.
R3(config-router)# bfd all-interfaces
7. Configure Network Entity Title (NET).
R3(config-router)# net 49.0000.0000.0003.00
8. Commit the candidate configuration to the running configuration.
R3(config-router)# commit
Configuration
To set up Multi Topology in ISIS, the configuration is as shown below:
Topology
This topology diagram consists of five routers (R1, R2,R3,R4 and R5).
It has both ISIS IPv4 and IPv6 routing enabled, except the link between R2 and R4 which has only IPv6 enabled.
In Single Topology, router R1 receives the information and calculates a SPF tree. To reach 5.5.5.5 (R5 IPv4), it takes the path R1-> R2 -> R4 ->R5. However, it fails since R2 to R4 is solely an IPv6 path. Since the same SPF tree is used for both IPv4 and IPv6 in R1, it considers the link between R2 -> R4 as the shortest path instead of R2 -> R3 -> R4.
On enabling Multi Topology on all the routers, SPF trees are calculated separately for IPv4 and IPv6 routing. This means, to reach from R1 to R5, IPv4 takes the R1 -> R2 -> R3 -> R4 -> R5 path and IPv6 takes the R1 -> R2 -> R4 -> R5 path.
ISIS Multi Topology
To configure multi topology on the routers R1, R2, R3, R4 and R5, follow the steps mentioned below:
Note: Ensure that the Prerequisites are met for all the routers.
Note: Modify the commands for the relevant routers being configured (R1, R2, R3, R4 or R5).
1. Set the routing process ID as 1.
R1(config)# router isis 1
2. Configure metric-style wide.
R1(config-router)# metric-style wide
3. Configure address family IPv6.
R1(config-router)#address-family ipv6
4. Enable multi topology with level 1.
R1(config-router-af)#multi-topology level-1
5. Commit the candidate configuration to the running configuration.
R1(config-router-af)#commit
Validation for Multi Topology
R1#show clns neighbors
Total number of L1 adjacencies: 1
Total number of L2 adjacencies: 0
Total number of adjacencies: 1
Tag 1: VRF : default
System Id Interface SNPA State Holdtime Type Protocol
R2 xe22 00e0.4b77.39fe Up 19 L1 M-ISIS
R1#show clns is-neighbors detail
Tag 1: VRF : default
System Id Interface State Type Priority Circuit Id
R2 xe22 Up L1 64 0000.0000.0001.02
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:09:39
Area Address(es): 49
IP Address(es): 10.1.1.2
IPv6 Address(es): fe80::2e0:4bff:fe77:39fe
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R1#show isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 --
R2 10 R2 xe22 00e0.4b77.39fe
R3 20 R2 xe22 00e0.4b77.39fe
R4 30 R2 xe22 00e0.4b77.39fe
R5 40 R2 xe22 00e0.4b77.39fe
R1#show ipv6 isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 --
R2 10 R2 xe22 00e0.4b77.39fe
R3 20 R2 xe22 00e0.4b77.39fe
R4 20 R2 xe22 00e0.4b77.39fe
R5 30 R2 xe22 00e0.4b77.39fe
R1#show ip route
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2,
ia - IS-IS inter area, E - EVPN,
v - vrf leaked
* - candidate default
IP Route Table for VRF "default"
C 1.1.1.1/32 is directly connected, lo, installed 01:55:53, last update 01:55:53 ago
i L1 2.2.2.2/32 [115/20] via 10.1.1.2, xe22, installed 01:09:50, last update 01:09:50 ago
i L1 3.3.3.3/32 [115/30] via 10.1.1.2, xe22, installed 01:09:50, last update 01:09:50 ago
i L1 4.4.4.4/32 [115/40] via 10.1.1.2, xe22, installed 00:09:50, last update 00:09:50 ago
i L1 5.5.5.5/32 [115/50] via 10.1.1.2, xe22, installed 00:09:50, last update 00:09:50 ago
C 10.1.1.0/24 is directly connected, xe22, installed 01:55:53, last update 01:55:53 ago
i L1 30.1.1.0/24 [115/40] via 10.1.1.2, xe22, installed 00:09:50, last update 00:09:50 ago
i L1 40.1.1.0/24 [115/20] via 10.1.1.2, xe22, installed 01:09:50, last update 01:09:50 ago
i L1 50.1.1.0/24 [115/30] via 10.1.1.2, xe22, installed 01:09:50, last update 01:09:50 ago
C 127.0.0.0/8 is directly connected, lo, installed 01:57:14, last update 01:57:14 ago
Gateway of last resort is not set
R1#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, D- DHCP, R - RIP,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, E - EVPN N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, i - IS-IS, B - BGP,
v - vrf leaked
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, installed 01:57:15, last update 01:57:15 ago
C 1001::/64 via ::, xe22, installed 01:32:33, last update 01:32:33 ago
C 1111::11/128 via ::, lo, installed 01:33:09, last update 01:33:09 ago
i L1 2001::/64 [115/20] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 2222::22/128 [115/20] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 3001::/64 [115/30] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 3333::33/128 [115/30] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 4001::/64 [115/20] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 4444::44/128 [115/30] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 5001::/64 [115/30] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
i L1 5555::55/128 [115/40] via fe80::2e0:4bff:fe77:39fe, xe22, installed 00:09:51, last update 00:09:51 ago
C fe80::/64 via ::, xe25, installed 01:56:18, last update 01:56:18 ago
R1#show isis spf-logs level-1-2
Tag 1: VRF : default
Level-1 spf logs:
Next SPF is not scheduled yet
SPF schedule delay min 0 secs 500 msecs
SPF schedule delay max 50 secs 0 msecs
SPF algorithm executed 12 times
SPF algorithm last executed 00:09:57.608 ago
R1#show isis database verbose
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 * 0x00000015 0x9E64 602 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 * 0x0000000C 0x724E 602 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 601 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 40.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 601 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 601 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 601 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 4.4.4.4/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 601 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 601 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 601 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 601 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R1#show isis database detail
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 * 0x00000015 0x9E64 596 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 * 0x0000000C 0x724E 596 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 595 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 595 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 595 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 595 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 4.4.4.4/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 595 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 595 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 595 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 595 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R2:
R2#show clns neighbors
Total number of L1 adjacencies: 3
Total number of L2 adjacencies: 0
Total number of adjacencies: 3
Tag 1: VRF : default
System Id Interface SNPA State Holdtime Type Protocol
R1 xe12 e8c5.7a69.446f Up 6 L1 M-ISIS
R3 xe23 903c.b3c5.ae9b Up 6 L1 M-ISIS
R4 xe24 9819.2ccf.ede3 Up 9 L1 M-ISIS
R2#show clns is-neighbors detail
Tag 1: VRF : default
System Id Interface State Type Priority Circuit Id
R1 xe12 Up L1 64 0000.0000.0001.02
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:10:56
Area Address(es): 49
IP Address(es): 10.1.1.1
IPv6 Address(es): fe80::eac5:7aff:fe69:446f
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R3 xe23 Up L1 64 0000.0000.0003.03
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:10:56
Area Address(es): 49
IP Address(es): 40.1.1.2
IPv6 Address(es): fe80::923c:b3ff:fec5:ae9b
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R4 xe24 Up L1 64 0000.0000.0004.04
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:10:56
Area Address(es): 49
IPv6 Address(es): fe80::9a19:2cff:fecf:ede3
Topology: IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R2#show isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 10 R1 xe12 e8c5.7a69.446f
R2 --
R3 10 R3 xe23 903c.b3c5.ae9b
R4 20 R3 xe23 903c.b3c5.ae9b
R5 30 R3 xe23 903c.b3c5.ae9b
R2#show ipv6 isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 10 R1 xe12 e8c5.7a69.446f
R2 --
R3 10 R3 xe23 903c.b3c5.ae9b
R4 10 R4 xe24 9819.2ccf.ede3
R5 20 R4 xe24 9819.2ccf.ede3
R2#show ip route
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2,
ia - IS-IS inter area, E - EVPN,
v - vrf leaked
* - candidate default
IP Route Table for VRF "default"
i L1 1.1.1.1/32 [115/20] via 10.1.1.1, xe12, installed 01:11:03, last update 01:11:03 ago
C 2.2.2.2/32 is directly connected, lo, installed 01:59:20, last update 01:59:20 ago
i L1 3.3.3.3/32 [115/20] via 40.1.1.2, xe23, installed 01:11:03, last update 01:11:03 ago
i L1 4.4.4.4/32 [115/30] via 40.1.1.2, xe23, installed 00:11:03, last update 00:11:03 ago
i L1 5.5.5.5/32 [115/40] via 40.1.1.2, xe23, installed 00:11:03, last update 00:11:03 ago
C 10.1.1.0/24 is directly connected, xe12, installed 01:57:30, last update 01:57:30 ago
C 20.1.1.0/24 is directly connected, xe24, installed 01:59:19, last update 01:59:19 ago
i L1 30.1.1.0/24 [115/30] via 40.1.1.2, xe23, installed 00:11:03, last update 00:11:03 ago
C 40.1.1.0/24 is directly connected, xe23, installed 01:59:19, last update 01:59:19 ago
i L1 50.1.1.0/24 [115/20] via 40.1.1.2, xe23, installed 01:11:03, last update 01:11:03 ago
C 127.0.0.0/8 is directly connected, lo, installed 02:20:04, last update 02:20:04 ago
Gateway of last resort is not set
R2#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, D- DHCP, R - RIP,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, E - EVPN N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, i - IS-IS, B - BGP,
P - SRV6-POLICY,
v - vrf leaked
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, installed 02:20:05, last update 02:20:05 ago
C 1001::/64 via ::, xe12, installed 01:32:42, last update 01:32:42 ago
i L1 1111::11/128 [115/20] via fe80::eac5:7aff:fe69:446f, xe12, installed 00:11:04, last update 00:11:04 ago
C 2001::/64 via ::, xe24, installed 01:59:20, last update 01:59:20 ago
C 2222::22/128 via ::, lo, installed 01:33:21, last update 01:33:21 ago
i L1 3001::/64 [115/20] via fe80::9a19:2cff:fecf:ede3, xe24, installed 00:11:04, last update 00:11:04 ago
i L1 3333::33/128 [115/20] via fe80::923c:b3ff:fec5:ae9b, xe23, installed 01:11:04, last update 01:11:04 ago
C 4001::/64 via ::, xe23, installed 01:24:52, last update 01:24:52 ago
i L1 4444::44/128 [115/20] via fe80::9a19:2cff:fecf:ede3, xe24, installed 00:11:04, last update 00:11:04 ago
i L1 5001::/64 [115/20] via fe80::923c:b3ff:fec5:ae9b, xe23, installed 01:11:04, last update 00:11:04 ago
[115/20] via fe80::9a19:2cff:fecf:ede3, xe24
i L1 5555::55/128 [115/30] via fe80::9a19:2cff:fecf:ede3, xe24, installed 00:11:04, last update 00:11:04 ago
C fe80::/64 via ::, xe12, installed 01:57:31, last update 01:57:31 ago
R2#show isis spf-logs level-1-2
Tag 1: VRF : default
Level-1 spf logs:
Next SPF is not scheduled yet
SPF schedule delay min 0 secs 500 msecs
SPF schedule delay max 50 secs 0 msecs
SPF algorithm executed 12 times
SPF algorithm last executed 00:11:11.544 ago
R2#show isis database verbose
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 527 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 527 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 * 0x00000014 0x2A52 528 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 40.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 527 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 527 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 527 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 4.4.4.4/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 527 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 527 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 527 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 527 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R2#show isis database detail
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 520 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 520 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 * 0x00000014 0x2A52 521 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 520 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 520 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 520 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 4.4.4.4/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 520 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 520 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 520 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 520 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R3:
R3#show clns neighbors
Total number of L1 adjacencies: 2
Total number of L2 adjacencies: 0
Total number of adjacencies: 2
Tag 1: VRF : default
System Id Interface SNPA State Holdtime Type Protocol
R4 xe31/1 9819.2ccf.ede9 Up 9 L1 M-ISIS
R2 xe31/4 00e0.4b77.3a09 Up 27 L1 M-ISIS
R3#show clns is-neighbors detail
Tag 1: VRF : default
System Id Interface State Type Priority Circuit Id
R4 xe31/1 Up L1 64 0000.0000.0004.01
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:11:42
Area Address(es): 49
IP Address(es): 50.1.1.2
IPv6 Address(es): fe80::9a19:2cff:fecf:ede9
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R2 xe31/4 Up L1 64 0000.0000.0003.03
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:11:42
Area Address(es): 49
IP Address(es): 40.1.1.1
IPv6 Address(es): fe80::2e0:4bff:fe77:3a09
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R3#show isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 20 R2 xe31/4 00e0.4b77.3a09
R2 10 R2 xe31/4 00e0.4b77.3a09
R3 --
R4 10 R4 xe31/1 9819.2ccf.ede9
R5 20 R4 xe31/1 9819.2ccf.ede9
R3#show ipv6 isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 20 R2 xe31/4 00e0.4b77.3a09
R2 10 R2 xe31/4 00e0.4b77.3a09
R3 --
R4 10 R4 xe31/1 9819.2ccf.ede9
R5 20 R4 xe31/1 9819.2ccf.ede9
R3#show ip route
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2,
ia - IS-IS inter area, E - EVPN,
v - vrf leaked
* - candidate default
IP Route Table for VRF "default"
i L1 1.1.1.1/32 [115/30] via 40.1.1.1, xe31/4, installed 01:11:53, last update 01:11:53 ago
i L1 2.2.2.2/32 [115/20] via 40.1.1.1, xe31/4, installed 01:11:53, last update 01:11:53 ago
C 3.3.3.3/32 is directly connected, lo, installed 02:00:27, last update 02:00:27 ago
i L1 4.4.4.4/32 [115/20] via 50.1.1.2, xe31/1, installed 01:11:53, last update 01:11:53 ago
i L1 5.5.5.5/32 [115/30] via 50.1.1.2, xe31/1, installed 01:11:53, last update 01:11:53 ago
i L1 10.1.1.0/24 [115/20] via 40.1.1.1, xe31/4, installed 01:11:53, last update 01:11:53 ago
i L1 30.1.1.0/24 [115/20] via 50.1.1.2, xe31/1, installed 01:11:53, last update 01:11:53 ago
C 40.1.1.0/24 is directly connected, xe31/4, installed 02:00:09, last update 02:00:09 ago
C 50.1.1.0/24 is directly connected, xe31/1, installed 02:00:26, last update 02:00:26 ago
C 127.0.0.0/8 is directly connected, lo, installed 02:18:52, last update 02:18:52 ago
Gateway of last resort is not set
R3#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, D- DHCP, R - RIP,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, E - EVPN N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, i - IS-IS, B - BGP,
v - vrf leaked
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, installed 02:18:53, last update 02:18:53 ago
i L1 1001::/64 [115/20] via fe80::2e0:4bff:fe77:3a09, xe31/4, installed 00:11:54, last update 00:11:54 ago
i L1 1111::11/128 [115/30] via fe80::2e0:4bff:fe77:3a09, xe31/4, installed 00:11:54, last update 00:11:54 ago
i L1 2001::/64 [115/20] via fe80::9a19:2cff:fecf:ede9, xe31/1, installed 00:11:54, last update 00:11:54 ago
[115/20] via fe80::2e0:4bff:fe77:3a09, xe31/4
i L1 2222::22/128 [115/20] via fe80::2e0:4bff:fe77:3a09, xe31/4, installed 00:11:54, last update 00:11:54 ago
i L1 3001::/64 [115/20] via fe80::9a19:2cff:fecf:ede9, xe31/1, installed 00:11:54, last update 00:11:54 ago
C 3333::33/128 via ::, lo, installed 01:31:50, last update 01:31:50 ago
C 4001::/64 via ::, xe31/4, installed 01:30:10, last update 01:30:10 ago
i L1 4444::44/128 [115/20] via fe80::9a19:2cff:fecf:ede9, xe31/1, installed 00:11:54, last update 00:11:54 ago
C 5001::/64 via ::, xe31/1, installed 01:29:43, last update 01:29:43 ago
i L1 5555::55/128 [115/30] via fe80::9a19:2cff:fecf:ede9, xe31/1, installed 00:11:54, last update 00:11:54 ago
C fe80::/64 via ::, xe31/4, installed 02:00:10, last update 02:00:10 ago
R3#show isis spf-logs level-1-2
Tag 1: VRF : default
Level-1 spf logs:
Next SPF is not scheduled yet
SPF schedule delay min 0 secs 500 msecs
SPF schedule delay max 50 secs 0 msecs
SPF algorithm executed 12 times
SPF algorithm last executed 00:12:00.519 ago
R3#show isis database verbose
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 478 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 478 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 478 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 40.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 * 0x00000013 0x7FCC 479 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 * 0x0000000C 0x6D4E 479 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 478 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 4.4.4.4/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 478 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 478 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 478 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 478 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R3#show isis database detail
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 471 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 471 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 471 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 * 0x00000013 0x7FCC 472 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 * 0x0000000C 0x6D4E 472 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 471 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 4.4.4.4/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 471 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 471 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 471 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 471 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R4:
R4#show clns neighbors
Total number of L1 adjacencies: 3
Total number of L2 adjacencies: 0
Total number of adjacencies: 3
Tag 1: VRF : default
System Id Interface SNPA State Holdtime Type Protocol
R5 xe1 e001.a6aa.0f23 Up 6 L1 M-ISIS
R2 xe2 00e0.4b77.3a0a Up 22 L1 M-ISIS
R3 ge8 903c.b3c5.ae98 Up 22 L1 M-ISIS
R4#show clns is-neighbors detail
Tag 1: VRF : default
System Id Interface State Type Priority Circuit Id
R5 xe1 Up L1 64 0000.0000.0005.02
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:12:38
Area Address(es): 49
IP Address(es): 30.1.1.2
IPv6 Address(es): fe80::e201:a6ff:feaa:f23
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R2 xe2 Up L1 64 0000.0000.0004.04
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:12:37
Area Address(es): 49
IPv6 Address(es): fe80::2e0:4bff:fe77:3a0a
Topology: IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R3 ge8 Up L1 64 0000.0000.0004.01
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:12:38
Area Address(es): 49
IP Address(es): 50.1.1.1
IPv6 Address(es): fe80::923c:b3ff:fec5:ae98
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R4#show isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 30 R3 ge8 903c.b3c5.ae98
R2 20 R3 ge8 903c.b3c5.ae98
R3 10 R3 ge8 903c.b3c5.ae98
R4 --
R5 10 R5 xe1 e001.a6aa.0f23
R4#show ipv6 isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 20 R2 xe2 00e0.4b77.3a0a
R2 10 R2 xe2 00e0.4b77.3a0a
R3 10 R3 ge8 903c.b3c5.ae98
R4 --
R5 10 R5 xe1 e001.a6aa.0f23
R4#show ip route
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2,
ia - IS-IS inter area, E - EVPN,
v - vrf leaked
* - candidate default
IP Route Table for VRF "default"
i L1 1.1.1.1/32 [115/40] via 50.1.1.1, ge8, installed 00:12:48, last update 00:12:48 ago
i L1 2.2.2.2/32 [115/30] via 50.1.1.1, ge8, installed 00:12:48, last update 00:12:48 ago
i L1 3.3.3.3/32 [115/20] via 50.1.1.1, ge8, installed 01:01:13, last update 01:01:13 ago
C 4.4.4.4/32 is directly connected, lo, installed 02:01:55, last update 02:01:55 ago
i L1 5.5.5.5/32 [115/20] via 30.1.1.2, xe1, installed 01:12:47, last update 01:12:47 ago
i L1 10.1.1.0/24 [115/30] via 50.1.1.1, ge8, installed 00:12:48, last update 00:12:48 ago
C 20.1.1.0/24 is directly connected, xe2, installed 02:01:04, last update 02:01:04 ago
C 30.1.1.0/24 is directly connected, xe1, installed 02:01:55, last update 02:01:55 ago
i L1 40.1.1.0/24 [115/20] via 50.1.1.1, ge8, installed 01:01:13, last update 01:01:13 ago
C 50.1.1.0/24 is directly connected, ge8, installed 02:01:22, last update 02:01:22 ago
C 127.0.0.0/8 is directly connected, lo, installed 02:20:17, last update 02:20:17 ago
Gateway of last resort is not set
R4#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, D- DHCP, R - RIP,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, E - EVPN N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, i - IS-IS, B - BGP,
v - vrf leaked
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, installed 02:20:18, last update 02:20:18 ago
i L1 1001::/64 [115/20] via fe80::2e0:4bff:fe77:3a0a, xe2, installed 00:12:48, last update 00:12:48 ago
i L1 1111::11/128 [115/30] via fe80::2e0:4bff:fe77:3a0a, xe2, installed 00:12:48, last update 00:12:48 ago
C 2001::/64 via ::, xe2, installed 02:01:05, last update 02:01:05 ago
i L1 2222::22/128 [115/20] via fe80::2e0:4bff:fe77:3a0a, xe2, installed 00:12:48, last update 00:12:48 ago
C 3001::/64 via ::, xe1, installed 01:33:20, last update 01:33:20 ago
i L1 3333::33/128 [115/20] via fe80::923c:b3ff:fec5:ae98, ge8, installed 01:01:14, last update 01:01:14 ago
i L1 4001::/64 [115/20] via fe80::2e0:4bff:fe77:3a0a, xe2, installed 01:04:04, last update 00:12:48 ago
[115/20] via fe80::923c:b3ff:fec5:ae98, ge8
C 4444::44/128 via ::, lo, installed 01:33:04, last update 01:33:04 ago
C 5001::/64 via ::, ge8, installed 01:29:27, last update 01:29:27 ago
i L1 5555::55/128 [115/20] via fe80::e201:a6ff:feaa:f23, xe1, installed 00:12:48, last update 00:12:48 ago
C fe80::/64 via ::, xe2, installed 02:01:05, last update 02:01:05 ago
R4#show isis spf-logs level-1-2
Tag 1: VRF : default
Level-1 spf logs:
Next SPF is not scheduled yet
SPF schedule delay min 0 secs 500 msecs
SPF schedule delay max 50 secs 0 msecs
SPF algorithm executed 12 times
SPF algorithm last executed 00:12:55.361 ago
R4#show isis database verbose
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 423 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 423 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 423 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 40.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 423 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 423 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 * 0x00000015 0x8C0D 424 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 4.4.4.4/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 * 0x00000007 0x9A25 424 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 * 0x0000000C 0x6751 424 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 423 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 423 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R4#show isis database detail
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 417 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 417 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 417 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Metric: 10 IP-Extended 10.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 417 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 417 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 * 0x00000015 0x8C0D 418 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 4.4.4.4/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 * 0x00000007 0x9A25 418 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 * 0x0000000C 0x6751 418 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 0x00000010 0xFA0F 417 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Metric: 10 IP-Extended 30.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 0x00000007 0xA813 417 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
R5:
R5#show clns neighbors
Total number of L1 adjacencies: 1
Total number of L2 adjacencies: 0
Total number of adjacencies: 1
Tag 1: VRF : default
System Id Interface SNPA State Holdtime Type Protocol
R4 ce22/4 9819.2ccf.ede2 Up 28 L1 M-ISIS
R5#show clns is-neighbors detail
Tag 1: VRF : default
System Id Interface State Type Priority Circuit Id
R4 ce22/4 Up L1 64 0000.0000.0005.02
L1 Adjacency ID: 1
L2 Adjacency ID: 2
Uptime: 01:13:32
Area Address(es): 49
IP Address(es): 30.1.1.1
IPv6 Address(es): fe80::9a19:2cff:fecf:ede2
Topology: IPv4, IPv6
Level-1 Protocols Supported: IPv4, IPv6
Bidirectional Forwarding Detection is enabled
Adjacency advertisement: Advertise
R5#show isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 40 R4 ce22/4 9819.2ccf.ede2
R2 30 R4 ce22/4 9819.2ccf.ede2
R3 20 R4 ce22/4 9819.2ccf.ede2
R4 10 R4 ce22/4 9819.2ccf.ede2
R5 --
R5#show ipv6 isis topology
Tag 1: VRF : default
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R1 30 R4 ce22/4 9819.2ccf.ede2
R2 20 R4 ce22/4 9819.2ccf.ede2
R3 20 R4 ce22/4 9819.2ccf.ede2
R4 10 R4 ce22/4 9819.2ccf.ede2
R5 --
R5#show ip route
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2,
ia - IS-IS inter area, E - EVPN,
v - vrf leaked
* - candidate default
IP Route Table for VRF "default"
i L1 1.1.1.1/32 [115/50] via 30.1.1.1, ce22/4, installed 00:13:40, last update 00:13:40 ago
i L1 2.2.2.2/32 [115/40] via 30.1.1.1, ce22/4, installed 00:13:40, last update 00:13:40 ago
i L1 3.3.3.3/32 [115/30] via 30.1.1.1, ce22/4, installed 01:02:05, last update 01:02:05 ago
i L1 4.4.4.4/32 [115/20] via 30.1.1.1, ce22/4, installed 01:13:40, last update 01:13:40 ago
C 5.5.5.5/32 is directly connected, lo, installed 02:03:15, last update 02:03:15 ago
i L1 10.1.1.0/24 [115/40] via 30.1.1.1, ce22/4, installed 00:13:40, last update 00:13:40 ago
C 30.1.1.0/24 is directly connected, ce22/4, installed 02:03:15, last update 02:03:15 ago
i L1 40.1.1.0/24 [115/30] via 30.1.1.1, ce22/4, installed 01:04:55, last update 01:04:55 ago
i L1 50.1.1.0/24 [115/20] via 30.1.1.1, ce22/4, installed 01:02:05, last update 01:02:05 ago
C 127.0.0.0/8 is directly connected, lo, installed 02:20:59, last update 02:20:59 ago
Gateway of last resort is not set
R5#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, D- DHCP, R - RIP,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, E - EVPN N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, i - IS-IS, B - BGP,
P - SRV6-POLICY,
v - vrf leaked
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, installed 02:21:00, last update 02:21:00 ago
i L1 1001::/64 [115/30] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
i L1 1111::11/128 [115/40] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
i L1 2001::/64 [115/20] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
i L1 2222::22/128 [115/30] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
C 3001::/64 via ::, ce22/4, installed 01:05:32, last update 01:05:32 ago
i L1 3333::33/128 [115/30] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
i L1 4001::/64 [115/30] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
i L1 4444::44/128 [115/20] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
i L1 5001::/64 [115/20] via fe80::9a19:2cff:fecf:ede2, ce22/4, installed 00:13:41, last update 00:13:41 ago
C 5555::55/128 via ::, lo, installed 01:06:20, last update 01:06:20 ago
C fe80::/64 via ::, ce22/4, installed 02:03:16, last update 02:03:16 ago
R5#show isis spf-logs level-1-2
Tag 1: VRF : default
Level-1 spf logs:
Next SPF is not scheduled yet
SPF schedule delay min 0 secs 500 msecs
SPF schedule delay max 50 secs 0 msecs
SPF algorithm executed 12 times
SPF algorithm last executed 00:13:45.938 ago
R5#show isis database verbose
Tag 1: VRF : default
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R1.00-00 0x00000015 0x9E64 373 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R1
IP Address: 1.1.1.1
IPv6 Address: 1111::11
Metric: 10 IS-Extended R1.02
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IP-Extended 1.1.1.1/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 1111::11/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
R1.02-00 0x0000000C 0x724E 373 0/0/0
Metric: 0 IS-Extended R1.00
Metric: 0 IS-Extended R2.00
R2.00-00 0x00000014 0x2A52 373 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R2
IP Address: 2.2.2.2
IPv6 Address: 2222::22
Metric: 10 IS-Extended R1.02
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R1.02
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IP-Extended 2.2.2.2/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 10.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 40.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 2222::22/128
Metric: 10 IPv6 (MT-IPv6) 1001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
R3.00-00 0x00000013 0x7FCC 372 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R3
IP Address: 3.3.3.3
IPv6 Address: 3333::33
Metric: 10 IS-Extended R4.01
Metric: 10 IS-Extended R3.03
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IS (MT-IPv6) R3.03
Metric: 10 IP-Extended 3.3.3.3/32
Metric: 10 IP-Extended 50.1.1.0/24
Metric: 10 IP-Extended 40.1.1.0/24
Metric: 10 IPv6 (MT-IPv6) 3333::33/128
Metric: 10 IPv6 (MT-IPv6) 5001::/64
Metric: 10 IPv6 (MT-IPv6) 4001::/64
R3.03-00 0x0000000C 0x6D4E 372 0/0/0
Metric: 0 IS-Extended R3.00
Metric: 0 IS-Extended R2.00
R4.00-00 0x00000015 0x8C0D 373 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R4
IP Address: 50.1.1.2
IPv6 Address: 5001::2
Metric: 10 IS-Extended R5.02
Metric: 10 IS-Extended R4.01
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IS (MT-IPv6) R4.04
Metric: 10 IS (MT-IPv6) R4.01
Metric: 10 IP-Extended 50.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 4.4.4.4/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 4444::44/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
Metric: 10 IPv6 (MT-IPv6) 2001::/64
Metric: 10 IPv6 (MT-IPv6) 5001::/64
R4.01-00 0x00000007 0x9A25 373 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R3.00
R4.04-00 0x0000000C 0x6751 373 0/0/0
Metric: 0 IS-Extended R4.00
Metric: 0 IS-Extended R2.00
R5.00-00 * 0x00000010 0xFA0F 373 0/0/0
Area Address: 49
Topology: IPv4 (0x0) IPv6 (0x2)
NLPID: 0xCC 0x8E
Hostname: R5
IP Address: 5.5.5.5
IPv6 Address: 5555::55
Metric: 10 IS-Extended R5.02
Metric: 10 IS (MT-IPv6) R5.02
Metric: 10 IP-Extended 5.5.5.5/32
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IP-Extended 30.1.1.0/24
Prefix Attribute Flags[0]: ELC Set
Metric: 10 IPv6 (MT-IPv6) 5555::55/128
Metric: 10 IPv6 (MT-IPv6) 3001::/64
R5.02-00 * 0x00000007 0xA813 373 0/0/0
Metric: 0 IS-Extended R5.00
Metric: 0 IS-Extended R4.00
Running Configuration
R1#sh running-config router isis
!
router isis 1
is-type level-1
metric-style wide
dynamic-hostname
bfd
all-interfaces
net 49.0000.0000.0001.00
!
address-family ipv6
multi-topology
level-1
exit-address-family
!
R1#
CLI Commands
The ISIS Multi-topology feature introduces the multi-topology configuration command.
multi topology
Use this command to configure the ISIS topology type.
Use no parameter of this command to set the topology back to single.
Command Syntax
multi-topology (level-1|level-1-2|level-2)
no multi-topology
Parameters
level-1 | Specify to enable multi-topology for level 1 |
level-2 | Specify to enable multi-topology for level 2 |
level-1-2 | Specify to enable multi-topology for both the levels |
Default
ISIS topology type applies to levels 1 and 2.
Command Mode
Address-family IPv6 mode.
Applicability
Introduced the multi-topology parameter in OcNOS version 6.5.2.
Example
The following sequence of commands is used to configure ISIS multi-topology type as transition for levels 1 and 2.
(config)#router isis 1
(config-router)#address-family ipv6 unicast
(config-router-af)#multi-topology level-1-2
Glossary
The following provides definitions for key terms or abbreviations and their meanings used throughout this document:
Key Terms/Acronym | Description |
ISIS | Intermediate System to Intermediate System is a link-state routing protocol. |
Multi Topology (MT) | In ISIS, Multi Topology (MT) is a mechanism to run a set of independent IP topologies within a single ISIS domain. |
Type Length Value (TLV) | A data structure used to encode optional information in a data communications protocol: • Type: the kind of field that this part of the message represents • Length: the size of the value field, usually in bytes • Value: a variable-sized set of bytes that contains the data of the message |
Shortest Path First (SPF) | Algorithm used by ISIS to make routing decisions based on the state of network links. |
Loopback | A troubleshooting test in which a signal is transmitted from a source to a destination and then back to the source again so that the signal can be measured and evaluated. |
Wide metric configuration | Allows ISIS to support larger networks by configuring high value metric in the interface. |
Hello Packets | Information packets used to discover ISIS neighbors and maintain adjacencies. |
Link State Packets (LSP) | Unidirectional, point-to-point, half-duplex connection used to exchange link state information. |