Area Border Router
This example shows configuration for an Area Border Router. R2 is an Area Border Router (ABR). On R2, interface eth2 is in Area 0, and interface eth1 is in Area 1.
Topology
Figure 5-27: OSPFv3 Area Border Router
Configuration
R2
#configure terminal | Enter configure mode. |
|---|---|
(config)#router ipv6 ospf | Create an OSPFv3 routing instance. |
(config-router)#router-id 10.10.10.11 | Specify a Router ID (10.10.10.11) for the OSPFv3 routing process. |
(config-router)#exit | Exit OSPF router mode. |
(config)#interface eth2 | Enter interface mode. |
(config-if)#ipv6 router ospf area 0 | Enable OSPFv3 routing on an interface, and assign the Area ID (0). |
(config-if)#exit | Exit interface mode. |
(config)#interface eth1 | Enter interface mode. |
(config-if)#ipv6 router ospf area 1 | Enable OSPFv3 routing on the other interface, and assign the other Area ID (1). |
(config-if)#commit | Commit the candidate configuration to the running configuration. |
(config-if)#exit | Exit interface mode. |
R4
#configure terminal | Enter configure mode. |
(config)#router ipv6 ospf | Create an OSPFv3 routing instance. |
(config-router)#router-id 10.10.10.12 | Specify a Router ID (10.10.10.12) for the OSPFv3 routing process. |
(config-if)#exit | Exit interface mode. |
(config)#interface eth1 | Enter interface mode. |
(config-if)#ipv6 router ospf area 1 | Enable OSPFv3 routing on the other interface, and assign the other Area ID (1). |
(config-if)#commit | Commit the candidate configuration to the running configuration. |
(config-if)#exit | Exit interface mode. |
Validation
R2
R2#show ipv6 ospf neighbor
Total number of full neighbors: 3
OSPFv3 Process (*null*)
Neighbor ID Pri State Dead Time Interface Instance ID
10.10.10.12 1 Full/Backup 00:00:32 eth1 0
10.10.10.10 1 Full/Backup 00:00:36 eth2 0
10.10.10.13 10 Full/DR 00:00:32 eth2 0
R2#
R2#show ipv6 ospf database
OSPFv3 Router with ID (10.10.10.11) (Process *null*)
Link-LSA (Interface eth1)
Link State ID ADV Router Age Seq# CkSum Prefix
0.0.0.3 10.10.10.11 945 0x80000001 0x9d7f 1
0.0.0.3 10.10.10.12 797 0x80000001 0x271c 1
Link-LSA (Interface eth2)
Link State ID ADV Router Age Seq# CkSum Prefix
0.0.0.4 10.10.10.10 1766 0x80000002 0x9a8b 1
0.0.0.4 10.10.10.11 1719 0x80000002 0x3fb0 1
0.0.0.4 10.10.10.13 6 0x80000004 0xd7e9 1
Router-LSA (Area 0.0.0.0)
Link State ID ADV Router Age Seq# CkSum Link
0.0.0.0 10.10.10.10 1703 0x80000005 0xf0ad 1
0.0.0.0 10.10.10.11 945 0x80000006 0xebaf 1
0.0.0.0 10.10.10.13 1708 0x80000005 0xdebc 1
Network-LSA (Area 0.0.0.0)
Link State ID ADV Router Age Seq# CkSum
0.0.0.4 10.10.10.13 1708 0x80000003 0xa4b1
Inter-Area-Prefix-LSA (Area 0.0.0.0)
Link State ID ADV Router Age Seq# CkSum
0.0.0.1 10.10.10.11 945 0x80000001 0xdc9f
Intra-Area-Prefix-LSA (Area 0.0.0.0)
Link State ID ADV Router Age Seq# CkSum Prefix Reference
0.0.0.2 10.10.10.13 1708 0x80000003 0xd741 1 Network-LSA
Intra-Area-Te-LSA (Area 0.0.0.0)
Link State ID ADV Router Age Seq# CkSum
0.0.0.4 10.10.10.10 1703 0x80000004 0x4ef9
0.0.0.4 10.10.10.11 1704 0x80000004 0x7acb
0.0.0.4 10.10.10.13 1708 0x80000004 0xd26f
Router-LSA (Area 0.0.0.1)
Link State ID ADV Router Age Seq# CkSum Link
0.0.0.0 10.10.10.11 785 0x80000003 0xa5fc 1
0.0.0.0 10.10.10.12 785 0x80000003 0x9c06 1
Network-LSA (Area 0.0.0.1)
Link State ID ADV Router Age Seq# CkSum
0.0.0.3 10.10.10.11 785 0x80000001 0x1672
Inter-Area-Prefix-LSA (Area 0.0.0.1)
Link State ID ADV Router Age Seq# CkSum
0.0.0.1 10.10.10.11 940 0x80000002 0xccaf
Intra-Area-Prefix-LSA (Area 0.0.0.1)
Link State ID ADV Router Age Seq# CkSum Prefix Reference
0.0.0.2 10.10.10.11 784 0x80000001 0xd747 1 Network-LSA
Intra-Area-Te-LSA (Area 0.0.0.1)
Link State ID ADV Router Age Seq# CkSum
0.0.0.3 10.10.10.11 785 0x80000002 0x70da
0.0.0.3 10.10.10.12 785 0x80000002 0x0146
R2#
R2#show ipv6 ospfv3 topology
OSPFv3 Process (*null*)
OSPFv3 paths to Area (0.0.0.0) routers
Router ID Bits Metric Next-Hop Interface
10.10.10.10 1 10.10.10.10 eth2
10.10.10.11 B --
10.10.10.13 1 10.10.10.13 eth2
OSPFv3 paths to Area (0.0.0.1) routers
Router ID Bits Metric Next-Hop Interface
10.10.10.11 B --
10.10.10.12 1 10.10.10.12 eth1
R2#
R2#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, 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
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, 01:09:54
C 3ffe:10::/64 via ::, eth2, 01:06:27
C 3ffe:11::/64 via ::, eth1, 00:21:16 R2#show ipv6 ospf route
OSPFv3 Process (*null*)
Codes: C - connected, D - Discard, 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
Destination Metric
Next-hop
C 3ffe:10::/64 1
directly connected, eth2, Area 0.0.0.0
C 3ffe:11::/64 1
directly connected, eth1, Area 0.0.0.1
R2#
C fe80::/64 via ::, eth9, 01:09:54
R2#
R1
R1#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, 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
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, 01:27:52
C 3ffe:10::/64 via ::, eth2, 01:25:13
O IA 3ffe:11::/64 [110/2] via fe80::5054:ff:fe3d:e317, eth2, 00:36:07
C fe80::/64 via ::, eth9, 01:27:52
R1#
R3
R3#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, 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
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, 01:26:53
C 3ffe:10::/64 via ::, eth2, 01:23:21
O IA 3ffe:11::/64 [110/2] via fe80::5054:ff:fe3d:e317, eth2, 00:34:39
C fe80::/64 via ::, eth9, 01:26:53
R3#
R4
R4#show ipv6 route
IPv6 Routing Table
Codes: K - kernel route, C - connected, S - static, 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
Timers: Uptime
IP Route Table for VRF "default"
C ::1/128 via ::, lo, 00:47:25
O IA 3ffe:10::/64 [110/2] via fe80::5054:ff:fe0e:46b7, eth1, 00:30:12
C 3ffe:11::/64 via ::, eth1, 00:36:23
C fe80::/64 via ::, eth9, 00:47:25
R4#
Last modified date: 07-13-2023