Verify the IS-IS Protocol and Adjacencies

This chapter describes how to check whether the Intermediate System-to-Intermediate System (IS-IS) protocol is configured correctly on a Juniper Networks router and that the proper adjacencies are formed in a network. (See Table 31.)

Table 31: Checklist for Verifying the IS-IS Protocol and Adjacencies

Verify the IS--IS Protocol and Adjacencies Tasks	Command or Action
Verify the IS-IS Configuration on a Router in a Network
Check the Configuration of a Level 1/Level 2 Router	`[edit protocols isis] show [edit protocols isis] run show isis interface [edit] edit interfaces [edit interfaces] show`
Check the Configuration of a Level 1 Router	`[edit protocols isis] show [edit protocols isis] run show isis interface [edit] edit interfaces [edit interfaces] show`
Check the Configuration of a Level 2 Router	`[edit protocols isis] show [edit protocols isis] run show isis interface [edit] edit interfaces [edit interfaces] show`
Display the Status of IS-IS Adjacencies
Verify Adjacent Routers	`show isis adjacency`
Examine a Route	`show route` `destination-prefixshow route detail` `destination-prefixshow isis route` `destination-prefix`
Examine the Forwarding Table	`show route forwarding-table destination` `destination-prefix`
Examine the Link-State Database	`show isis database`
Examine a Link-State Protocol Data Unit Header	`show isis database extensive`