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• View all IS-IS information.
EXEC Privilege mode
debug isis
• View information on all adjacency-related activity (for example, hello packets that are sent and
received).
EXEC Privilege mode
debug isis adj-packets [interface]
To view specific information, enter the following optional parameter:
– interface: Enter the type of interface and slot/port information to view IS-IS information on that
interface only.
• View information about IS-IS local update packets.
EXEC Privilege mode
debug isis local-updates [interface]
To view specific information, enter the following optional parameter:
– interface: Enter the type of interface and slot/port information to view IS-IS information on that
interface only.
• View IS-IS SNP packets, include CSNPs and PSNPs.
EXEC Privilege mode
debug isis snp-packets [interface]
To view specific information, enter the following optional parameter:
– interface: Enter the type of interface and slot/port information to view IS-IS information on that
interface only.
• View the events that triggered IS-IS shortest path first (SPF) events for debugging purposes.
EXEC Privilege mode
debug isis spf-triggers
• View sent and received LSPs.
EXEC Privilege mode
debug isis update-packets [interface]
To view specific information, enter the following optional parameter:
– interface: Enter the type of interface and slot/port information to view IS-IS information on that
interface only.
The system displays debug messages on the console. To view which debugging commands are enabled,
use the show debugging command in EXEC Privilege mode.
To disable a specific debug command, enter the keyword no then the debug command. For example, to
disable debugging of IS-IS updates, use the no debug isis updates-packets command.
To disable all IS-IS debugging, use the no debug isis command.
Intermediate System to Intermediate System
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