4. Verify That IS-IS Adjacencies Are Established

Purpose

After configuring IS-IS, you must verify that neighboring routers have formed adjacencies with each other.

Action

To verify IS-IS adjacencies, enter the following JUNOS command-line interface (CLI) operational mode command:

user@host> show isis adjacency

Sample Output

user@R1> show isis adjacency 

Interface             System         L State        Hold (secs) SNPA

so-0/0/0.0            R2             2 Up                   25

so-0/0/1.0            R5             2 Up                   23

so-0/0/2.0            R3             2 Up                   20

user@R3> show isis adjacency 

Interface             System         L State        Hold (secs) SNPA

so-0/0/0.0            R4             2 Up                   25

so-0/0/1.0            R2             2 Up                   25

so-0/0/2.0            R1             2 Up                   26

so-0/0/3.0            R6             2 Up                   25

user@R6> show isis adjacency 

Interface             System         L State        Hold (secs) SNPA

so-0/0/0.0            R5             2 Up                   19

so-0/0/1.0            R4             2 Up                   22

so-0/0/2.0            R2             2 Up                   22

so-0/0/3.0            R3             2 Up                   19

What It Means

The sample output from the ingress, transit, and egress routers shows that all routers in the network shown in Figure 1 have formed IS-IS adjacencies.