The router#show isis command shows if the IS-IS routing protocol is enabled on a specified router. This command also displays the system level information about IS-IS execution.
The router#show clns command provides global CLNS information such as the number of interfaces, NET, type of routing (L1, L2, or L1L2), and the routing area ID.
The router#show clns neighbor command shows the System ID, Interface ID, SNPA, Hold time, IS Type, and protocol used.
The router#show clns interface interface-name command displays details about the CLNS interface, where interface-name represents name of interface whose details are displayed.
The router#show clns protocol command displays details of CLNS protocol, including the areas involved with redistribution details.
The router#show clns traffic command displays details about network traffic sequence in a router.
The router#show isis database level-1 command displays the Level 1 link-state database.
The router#show isis database level-2 command displays the Level 2 link-state database.
The router#show isis spf-log command displays time and reason for the shortest path algorithm execution.
The debug isis adj-packets command enables IS-IS adjacency packets and displays IS-IS packet information.
The debug isis spf-events command enables debugging in the Shortest Path Function (SPF) events.
The debug isis snp-packets command enables and displays CSNP/PSNP packet information.
The debug isis spf-update command shows SPF updated information.