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 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