Tip

This is the documentation for the 25.06 version. Looking for the documentation of the latest version? Have a look here.

Finish Up

After completing the configuration, check the status as described in IS-IS Status.

The two main items to check are neighbors and routes.

Check Neighbors

First, check the neighbors to ensure the routers formed an adjacency with each others:

tnsr# show route dynamic isis neighbor
Area exco:
 System Id           Interface   L  State         Holdtime SNPA
 ro.example.com      CCLINK      1  Up            10       90ec.7747.5e5d

If the neighbors do not appear or have an unexpected status, double check the configuration and confirm the two nodes can communicate over their connected interface(s).

Check Routes

Next, check the routes received by IS-IS to ensure all of the expected networks are present:

tnsr# show route dynamic isis route
Area exco:
IS-IS paths to level-1 routers that speak IP
 Vertex             Type          Metric  Next-Hop          Interface  Parent
 --------------------------------------------------------------------------------------------
 hq.example.com
 10.2.0.0/24        IP internal   0                                    hq.example.com(4)
 10.127.0.0/30      IP internal   0                                    hq.example.com(4)
 ro.example.com     TE-IS         10      ro.example.com    CCLINK     hq.example.com(4)
 ro.example.com     pseudo_TE-IS  20      ro.example.com    CCLINK     ro.example.com(4)
 10.127.0.0/30      IP TE         20      ro.example.com    CCLINK     ro.example.com(4)
 10.30.0.0/24       IP TE         20      ro.example.com    CCLINK     ro.example.com(4)

IS-IS L1 IPv4 routing table:

 Prefix         Metric  Interface  Nexthop     Label(s)
 --------------------------------------------------------
 10.2.0.0/24    0       -          -           -
 10.30.0.0/24   20      CCLINK       10.127.0.2  -
 10.127.0.0/30  20      CCLINK       10.127.0.2  -

Check Connectivity

If the routes appear to be correct, try to communicate from a network local to the node:

tnsr# ping 10.30.0.1 source 10.2.0.1 count 5
PING 10.30.0.1 (10.30.0.1) from 10.2.0.1 : 56(84) bytes of data.
64 bytes from 10.30.0.1: icmp_seq=1 ttl=64 time=0.136 ms
64 bytes from 10.30.0.1: icmp_seq=2 ttl=64 time=0.108 ms
64 bytes from 10.30.0.1: icmp_seq=3 ttl=64 time=0.134 ms
64 bytes from 10.30.0.1: icmp_seq=4 ttl=64 time=0.106 ms
64 bytes from 10.30.0.1: icmp_seq=5 ttl=64 time=0.104 ms

--- 10.30.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4136ms
rtt min/avg/max/mdev = 0.104/0.117/0.136/0.014 ms