BGP MPLS Next Hop Tracking Configuration
MPLS nexthop tracking is used to track the registered next-hop in the NSM. It helps to notify the client when the LSP operational status changes, so that clients can take action accordingly.
BGP shall do lookup with NSM for LSP reachability, if lookup is successful, BGP marks the nexthop as reachable and register with NSM for the LSP tracking. Further proceeds for FTN/ILM installation and route advertisement. If it is down or does not exist, BGP will mark it as in-valid, route advertisement will not happen until LSP is reachable, BGP query NSM for every rib scan.
Note: QOS should be enabled in all devices for this feature.
Topology
BGP MPLS Next Hop Tracking
Configuration
PE1
#configure terminal | Enter the Configure mode. |
(config)#interface lo | Enter interface mode |
(config-if)#ip address 1.1.1.1/32 secondary | Configure the IP address of the interface loopback |
(config-if)#exit | Exit interface mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# router ldp | Configure Router LDP instance |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# bfd interval 3 minrx 3 multiplier 3 | Configure BFD single-hop sessions timer and reception interval in millisecond and the Hello multiplier. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#interface xe4 | Enter interface mode |
(config-if)#ip address 20.20.40.40/31 | Configure the IP address on the interface |
(config-if)#label-switching | Enable label-switching on interface |
(config-if)# enable-ldp ipv4 | Enable LDP process on interface |
(config-if)#exit | Exit interface mode. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router ospf 1 | Configure the routing process OSPF with process id |
(config-router)# bfd all-interfaces | Enable BFD for all neighbors. |
(config-router)#network 1.1.1.1/32 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#network 20.20.40.40/31 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#exit | Exit from router ospf mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#bgp nexthop-trigger enable | Enable Nexthop tracking. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router bgp 100 | Enter Router BGP mode |
(config-router)# mpls-nexthop-tracking | Enable MPLS Next Hop tracking |
(config-router)#allocate-label all | Allocate labels for all IPv4 prefixes advertised |
(config-router)#neighbor 4.4.4.4 remote-as 100 | Add loopback ip of PE2 as neighbor with neighbor AS |
(config-router)#neighbor 4.4.4.4 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)#neighbor 2.2.2.2 remote-as 100 | Add loopback ip of ABR1 as neighbor with neighbor AS |
(config-router)#neighbor 2.2.2.2 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 2.2.2.2 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# network 1.1.1.1/32 | Advertise a route via iBGP connection. |
(config-router-af)#exit-address-family | Exit from address family IPv4 unicast |
(config-router)#address-family ipv4 labeled- unicast | Enter into labeled-unicast address family |
(config-router-af)#neighbor 2.2.2.2 activate | Activate the neighbor inside labeled-unicast address family |
(config-router-af)#exit-address-family | Exit from address family IPv4 labeled unicast |
(config-router)#address-family vpnv4 unicast | Enter into vpnv4 unicast address family |
(config-router-af)#neighbor 4.4.4.4 activate | Activate the neighbor inside vpnv4 address family |
(config-router-af)#exit-address-family | Exit from address family vpnv4 |
(config-router)#exit | Exit from router BGP mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#end | Exit from config mode into privilege mode |
ABR1
#configure terminal | Enter the Configure mode. |
(config)#interface lo | Enter interface mode |
(config-if)#ip address 2.2.2.2/32 Secondary | Configure the IP address of the interface loopback |
(config-if)#exit | Exit interface mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# router ldp | Configure Router LDP instance |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# bfd interval 3 minrx 3 multiplier 3 | Configure BFD single-hop sessions timer and reception interval in millisecond and the Hello multiplier. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#interface xe4 | Enter interface mode |
(config-if)#ip address 20.20.40.41/31 | Configure the IP address on the interface |
(config-if)#label-switching | Enable label-switching on interface |
(config-if)# enable-ldp ipv4 | Enable LDP process on interface |
(config-if)#exit | Exit interface mode. |
(config)#interface xe10 | Enter interface mode |
(config-if)#ip address 20.20.40.48/31 | Configure the IP address on the interface |
(config-if)#label-switching | Enable label-switching on interface |
(config-if)# enable-ldp ipv4 | Enable LDP process on interface |
(config-if)#exit | Exit interface mode. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# enable ext-ospf-multi-inst | Enable multiple-instance capability. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router ospf 1 | Configure the routing process OSPF with process id |
(config)# bfd all-interfaces | Enable BFD for all neighbors. |
(config-router)#network 2.2.2.2/32 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#network 20.20.40.40/31 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#exit | Exit from router ospf mode |
(config)#router ospf 2 | Configure the routing process OSPF with process id |
(config)# bfd all-interfaces | Enable BFD for all neighbors. |
(config)# redistribute connected | Redistribute connected routes. |
(config-router)#network 2.2.2.2/32 area 0 instance-id 2 | Advertise the network in Area 0 with an instance ID of 2. |
(config-router)#network 20.20.40.48/31 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#exit | Exit from router ospf mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#bgp nexthop-trigger enable | Enable Nexthop tracking. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router bgp 100 | Enter Router BGP mode |
(config-router)# mpls-nexthop-tracking | Enable MPLS Next Hop tracking |
(config-router)#allocate-label all | Allocate labels for all IPv4 prefixes advertised |
(config-router)#neighbor 1.1.1.1 remote-as 100 | Add loopback ip of PE1 as neighbor with neighbor AS |
(config-router)#neighbor 1.1.1.1 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 1.1.1.1 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)#neighbor 3.3.3.3 remote-as 100 | Add loopback ip of ABR2 as neighbor with neighbor AS |
(config-router)#neighbor 3.3.3.3 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 3.3.3.3 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# network 2.2.2.2/32 | Advertise a route via iBGP connection. |
(config-router-af)#exit-address-family | Exit from address family IPv4 unicast |
(config-router)#address-family ipv4 labeled- unicast | Enter into labeled-unicast address family |
(config-router-af)#neighbor 1.1.1.1 activate | Activate the neighbor inside labeled-unicast address family |
(config-router-af)# neighbor 1.1.1.1 route-reflector-client | Configure the router as Route-reflector (RR) and Neighbor router as its client. |
(config-router-af)# neighbor 1.1.1.1 next-hop-self | Enable next hop self for the particular neighbor inside address family IPv4 labeled unicast. |
(config-router-af)#neighbor 3.3.3.3 activate | Activate the neighbor inside labeled-unicast address family |
(config-router-af)# neighbor 3.3.3.3 route-reflector-client | Configure the router as Route-reflector (RR) and Neighbor router as its client. |
(config-router-af)# neighbor 3.3.3.3 next-hop-self | Enable next hop self for the particular neighbor inside address family IPv4 labeled unicast. |
(config-router-af)#exit-address-family | Exit from address family IPv4 labeled unicast |
(config-router)#exit | Exit from router BGP mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#end | Exit from config mode into privilege mode |
ABR2
#configure terminal | Enter the Configure mode. |
(config)#interface lo | Enter interface mode |
(config-if)#ip address 3.3.3.3/32 | Configure the IP address of the interface loopback |
(config-if)#exit | Exit interface mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# router ldp | Configure Router LDP instance |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# bfd interval 3 minrx 3 multiplier 3 | Configure BFD single-hop sessions timer and reception interval in millisecond and the Hello multiplier. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#interface xe5 | Enter interface mode |
(config-if)#ip address 20.20.40.38/31 | Configure the IP address on the interface |
(config-if)#label-switching | Enable label-switching on interface |
(config-if)# enable-ldp ipv4 | Enable LDP process on interface |
(config-if)#exit | Exit interface mode. |
(config)#interface xe10 | Enter interface mode |
(config-if)#ip address 20.20.40.49/31 | Configure the IP address on the interface |
(config-if)#label-switching | Enable label-switching on interface |
(config-if)# enable-ldp ipv4 | Enable LDP process on interface |
(config-if)#exit | Exit interface mode. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# enable ext-ospf-multi-inst | Enable multiple-instance capability. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router ospf 2 | Configure the routing process OSPF with process id |
(config)# bfd all-interfaces | Enable BFD for all neighbors. |
(config)# redistribute connected | Redistribute connected routes. |
(config-router)#network 3.3.3.3/32 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#network 20.20.40.48/31 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#exit | Exit from router ospf mode |
(config)#router ospf 3 | Configure the routing process OSPF with process id |
(config)# bfd all-interfaces | Enable BFD for all neighbors. |
(config-router)#network 2.2.2.2/32 area 0 instance-id 3 | Advertise the network in Area 0 with an instance ID of 2. |
(config-router)#network 20.20.40.38/31 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#exit | Exit from router ospf mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#bgp nexthop-trigger enable | Enable Nexthop tracking. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router bgp 100 | Enter Router BGP mode |
(config-router)# mpls-nexthop-tracking | Enable MPLS Next Hop tracking |
(config-router)#allocate-label all | Allocate labels for all IPv4 prefixes advertised |
(config-router)#neighbor 4.4.4.4 remote-as 100 | Add loopback ip of PE2 as neighbor with neighbor AS |
(config-router)#neighbor 4.4.4.4 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 4.4.4.4 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)#neighbor 2.2.2.2 remote-as 100 | Add loopback ip of ABR1 as neighbor with neighbor AS |
(config-router)#neighbor 2.2.2.2 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 2.2.2.2 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# network 2.2.2.2/32 | Advertise a route via iBGP connection. |
(config-router-af)#exit-address-family | Exit from address family IPv4 unicast |
(config-router)#address-family ipv4 labeled- unicast | Enter into labeled-unicast address family |
(config-router-af)#neighbor 2.2.2.2 activate | Activate the neighbor inside labeled-unicast address family |
(config-router-af)# neighbor 2.2.2.2 route-reflector-client | Configure the router as Route-reflector (RR) and Neighbor router as its client. |
(config-router-af)# neighbor 2.2.2.2 next-hop-self | Enable next hop self for the particular neighbor inside address family IPv4 labeled unicast. |
(config-router-af)#neighbor 4.4.4.4 activate | Activate the neighbor inside labeled-unicast address family |
(config-router-af)# neighbor 4.4.4.4 route-reflector-client | Configure the router as Route-reflector (RR) and Neighbor router as its client. |
(config-router-af)# neighbor 4.4.4.4 next-hop-self | Enable next hop self for the particular neighbor inside address family IPv4 labeled unicast. |
(config-router-af)#exit-address-family | Exit from address family IPv4 labeled unicast |
(config-router)#exit | Exit from router BGP mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#end | Exit from config mode into privilege mode |
PE2
#configure terminal | Enter the Configure mode. |
(config)#interface lo | Enter interface mode |
(config-if)#ip address 4.4.4.4/32 secondary | Configure the IP address of the interface loopback |
(config-if)#exit | Exit interface mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# router ldp | Configure Router LDP instance |
(config)# commit | Committing the configuration to apply in running configuration |
(config)# bfd interval 3 minrx 3 multiplier 3 | Configure BFD single-hop sessions timer and reception interval in millisecond and the Hello multiplier. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#interface xe5 | Enter interface mode |
(config-if)#ip address 20.20.40.39/31 | Configure the IP address on the interface |
(config-if)#label-switching | Enable label-switching on interface |
(config-if)# enable-ldp ipv4 | Enable LDP process on interface |
(config-if)#exit | Exit interface mode. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router ospf 3 | Configure the routing process OSPF with process id |
(config)# bfd all-interfaces | Enable BFD for all neighbors. |
(config-router)#network 3.3.3.3/32 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#network 20.20.40.38/31 area 0 | Define the interface on which OSPF runs, and associate the area ID (0) with the interface (area ID 0 specifies the backbone area). |
(config-router)#exit | Exit from router ospf mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#bgp nexthop-trigger enable | Enable Nexthop tracking. |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#router bgp 100 | Enter Router BGP mode |
(config-router)# mpls-nexthop-tracking | Enable MPLS Next Hop tracking |
(config-router)#allocate-label all | Allocate labels for all IPv4 prefixes advertised |
(config-router)#neighbor 1.1.1.1 remote-as 100 | Add loopback ip of PE1 as neighbor with neighbor AS |
(config-router)#neighbor 1.1.1.1 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 1.1.1.1 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)#neighbor 3.3.3.3 remote-as 100 | Add loopback ip of ABR2 as neighbor with neighbor AS |
(config-router)#neighbor 3.3.3.3 update- source lo | Update the source for that particular neighbor as loopback interface |
(config-router)# neighbor 3.3.3.3 fall-over bfd multihop | Enabling BFD at BGP level for particular neighbor. |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# network 4.4.4.4/32 | Advertise a route via iBGP connection. |
(config-router-af)#exit-address-family | Exit from address family IPv4 unicast |
(config-router)#address-family ipv4 labeled- unicast | Enter into labeled-unicast address family |
(config-router-af)#neighbor 3.3.3.3 activate | Activate the neighbor inside labeled-unicast address family |
(config-router-af)#exit-address-family | Exit from address family IPv4 labeled unicast |
(config-router)#address-family vpnv4 unicast | Enter into vpnv4 unicast address family |
(config-router-af)#neighbor 1.1.1.1 activate | Activate the neighbor inside vpnv4 address family |
(config-router-af)#exit-address-family | Exit from address family vpnv4 |
(config-router)#exit | Exit from router BGP mode |
(config)# commit | Committing the configuration to apply in running configuration |
(config)#end | Exit from config mode into privilege mode |
Validation
PE1
PE1#show ip bgp labeled-unicast summary
BGP router identifier 1.1.1.1, local AS number 100
BGP table version is 3
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
2.2.2.2 4 100 90 89 3 0 0 00:36:22 3
Total number of neighbors 1
Total number of Established sessions 1
PE1#show bgp nexthop-tracking
Configured NHT: ENABLED
NHT Delay time-interval : 5
Configured MPLS NHT: ENABLED
BGP VRF: (Default) VRF_ID 0
BGP Instance: (Default), AS: 100, router-id 1.1.1.1
NHT is Enabled
Recvd Msg count from RIB: 0
NHT delay-timer remaining seconds: 0
BGP nexthop(s):
2.2.2.2 Registered (MPLS also Registered)
Total number of IPV4 nexthops : 1
Total number of IPV6 nexthops : 0
PE1#show ldp session
Peer IP Address IF Name My Role State KeepAlive UpTime
2.2.2.2 xe4 Passive OPERATIONAL 30 00:38:06
PE1#show ip bgp vpnv4 all summary
BGP router identifier 1.1.1.1, local AS number 100
BGP table version is 1
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
4.4.4.4 4 100 92 93 1 0 0 00:38:49 0
Total number of neighbors 1
Total number of Established sessions 1
PE1#show ip ospf neighbor
Total number of full neighbors: 1
OSPF process 1 VRF(default):
Neighbor ID Pri State Dead Time Address Interface Instance ID
2.2.2.2 1 Full/Backup 00:00:34 20.20.40.41 xe4 0
PE1#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, 00:59:57
O 2.2.2.2/32 [110/2] via 20.20.40.41, xe4, 00:40:05
B 3.3.3.3/32 [200/0] via 2.2.2.2 (recursive via 20.20.40.41), 00:36:31
B 4.4.4.4/32 [200/0] via 2.2.2.2 (recursive via 20.20.40.41), 00:36:31
C 20.20.40.40/31 is directly connected, xe4, 00:58:24
C 127.0.0.0/8 is directly connected, lo, 01:06:14
Gateway of last resort is not set
PE2
PE2#show ip bgp labeled-unicast summary
BGP router identifier 4.4.4.4, local AS number 100
BGP table version is 3
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Dow
n State/PfxRcd
3.3.3.3 4 100 103 102 3 0 0 00:41:58
3
Total number of neighbors 1
Total number of Established sessions 1
PE2#show bgp nexthop-tracking
Configured NHT: ENABLED
NHT Delay time-interval : 5
Configured MPLS NHT: ENABLED
BGP VRF: (Default) VRF_ID 0
BGP Instance: (Default), AS: 100, router-id 4.4.4.4
NHT is Enabled
Recvd Msg count from RIB: 0
NHT delay-timer remaining seconds: 0
BGP nexthop(s):
3.3.3.3 Registered (MPLS also Registered)
Total number of IPV4 nexthops : 1
Total number of IPV6 nexthops : 0
PE2#show ldp session
Peer IP Address IF Name My Role State KeepAlive UpTime
3.3.3.3 xe5 Active OPERATIONAL 30 00:42:33
PE2#show bgp vpn
PE2#show ip bgp vpnv4 all summary
BGP router identifier 4.4.4.4, local AS number 100
BGP table version is 1
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Dow
n State/PfxRcd
1.1.1.1 4 100 99 99 1 0 0 00:41:48
0
Total number of neighbors 1
Total number of Established sessions 1
PE2#show ip ospf neighbor
Total number of full neighbors: 1
OSPF process 3 VRF(default):
Neighbor ID Pri State Dead Time Address Interface
Instance ID
3.3.3.3 1 Full/Backup 00:00:35 20.20.40.38 xe5
0
PE2#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"
B 1.1.1.1/32 [200/0] via 3.3.3.3 (recursive via 20.20.40.38), 00:42:1
7
B 2.2.2.2/32 [200/0] via 3.3.3.3 (recursive via 20.20.40.38), 00:42:1
7
O 3.3.3.3/32 [110/2] via 20.20.40.38, xe5, 00:44:10
C 4.4.4.4/32 is directly connected, lo, 01:05:50
C 20.20.40.38/31 is directly connected, xe5, 01:01:12
C 127.0.0.0/8 is directly connected, lo, 01:11:16
Gateway of last resort is not set
ABR1
ABR1#show ip ospf neighbor
Total number of full neighbors: 1
OSPF process 1 VRF(default):
Neighbor ID Pri State Dead Time Address Interface Instance ID
1.1.1.1 1 Full/DR 00:00:34 20.20.40.40 xe4 0
Total number of full neighbors: 1
OSPF process 2 VRF(default):
Neighbor ID Pri State Dead Time Address Interface Instance ID
3.3.3.3 1 Full/Backup 00:00:37 20.20.40.49 xe10 0
ABR1#show ldp session
Peer IP Address IF Name My Role State KeepAlive UpTime
1.1.1.1 xe4 Active OPERATIONAL 30 00:46:10
3.3.3.3 xe10 Passive OPERATIONAL 30 00:43:55
ABR1#sh ip bgp vpnv4 all summary
ABR1#sh ip bgp labeled-unicast summary
BGP router identifier 2.2.2.2, local AS number 100
BGP table version is 2
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.1 4 100 113 113 2 0 0 00:46:44 1
3.3.3.3 4 100 109 111 2 0 0 00:45:10 2
Total number of neighbors 2
Total number of Established sessions 2
ABR1#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"
O 1.1.1.1/32 [110/2] via 20.20.40.40, xe4, 00:47:19
C 2.2.2.2/32 is directly connected, lo, 01:07:16
O 3.3.3.3/32 [110/2] via 20.20.40.49, xe10, 00:45:26
B 4.4.4.4/32 [200/0] via 3.3.3.3 (recursive via 20.20.40.49), 00:43:51
O E2 20.20.40.38/31 [110/20] via 20.20.40.49, xe10, 00:45:26
C 20.20.40.40/31 is directly connected, xe4, 00:58:36
C 20.20.40.48/31 is directly connected, xe10, 00:58:23
C 127.0.0.0/8 is directly connected, lo, 01:14:00
Gateway of last resort is not set
ABR1#show bgp nexthop-tracking
Configured NHT: ENABLED
NHT Delay time-interval : 5
Configured MPLS NHT: ENABLED
BGP VRF: (Default) VRF_ID 0
BGP Instance: (Default), AS: 100, router-id 2.2.2.2
NHT is Enabled
Recvd Msg count from RIB: 0
NHT delay-timer remaining seconds: 0
BGP nexthop(s):
1.1.1.1 Registered (MPLS also Registered)
3.3.3.3 Registered (MPLS also Registered)
Total number of IPV4 nexthops : 2
Total number of IPV6 nexthops : 0
ABR2
ABR2#show ip ospf neighbor
Total number of full neighbors: 1
OSPF process 2 VRF(default):
Neighbor ID Pri State Dead Time Address Interface Instance ID
2.2.2.2 1 Full/DR 00:00:37 20.20.40.48 xe10 0
Total number of full neighbors: 1
OSPF process 3 VRF(default):
Neighbor ID Pri State Dead Time Address Interface Instance ID
4.4.4.4 1 Full/DR 00:00:36 20.20.40.39 xe5 0
ABR2#
ABR2#show ldp session
Peer IP Address IF Name My Role State KeepAlive UpTime
2.2.2.2 xe10 Active OPERATIONAL 30 00:46:31
4.4.4.4 xe5 Passive OPERATIONAL 30 00:47:20
ABR2#show ip bgp labeled-unicast summary
BGP router identifier 3.3.3.3, local AS number 100
BGP table version is 2
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
2.2.2.2 4 100 115 114 2 0 0 00:47:21 2
4.4.4.4 4 100 114 115 2 0 0 00:47:21 1
Total number of neighbors 2
Total number of Established sessions 2
ABR2#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"
B 1.1.1.1/32 [200/0] via 2.2.2.2 (recursive via 20.20.40.48), 00:46:06
O 2.2.2.2/32 [110/2] via 20.20.40.48, xe10, 00:47:51
C 3.3.3.3/32 is directly connected, lo, 01:09:37
O 4.4.4.4/32 [110/2] via 20.20.40.39, xe5, 00:47:51
C 20.20.40.38/31 is directly connected, xe5, 00:48:33
O E2 20.20.40.40/31 [110/20] via 20.20.40.48, xe10, 00:47:51
C 20.20.40.48/31 is directly connected, xe10, 00:48:44
C 127.0.0.0/8 is directly connected, lo, 01:15:15
Gateway of last resort is not set
ABR2#show bgp nexthop-tracking
Configured NHT: ENABLED
NHT Delay time-interval : 5
Configured MPLS NHT: ENABLED
BGP VRF: (Default) VRF_ID 0
BGP Instance: (Default), AS: 100, router-id 3.3.3.3
NHT is Enabled
Recvd Msg count from RIB: 0
NHT delay-timer remaining seconds: 0
BGP nexthop(s):
2.2.2.2 Registered (MPLS also Registered)
4.4.4.4 Registered (MPLS also Registered)
Total number of IPV4 nexthops : 2
Total number of IPV6 nexthops : 0