Reference Guide

Intermediate System to Intermediate System | 519
Debug IS-IS
Enter the debug isis command in EXEC Privilege mode to debug all IS-IS processes.
Use the following commands for specific IS-IS debugging.
FTOS displays debug messages on the console. Use the
show debugging command in EXEC Privilege
mode to view which debugging commands are enabled.
Enter the keyword no followed by the debug command to disable a specific debug command. For example,
to disable debugging of IS-IS updates, enter
no debug isis updates-packets.
Enter
no debug isis to disable all IS-IS debugging.
Enter
undebug all to disable all debugging.
Command Syntax Command Mode Purpose
debug isis
EXEC Privilege View all IS-IS information.
debug isis adj-packets
[interface]
EXEC Privilege View information on all adjacency-related activity (for example,
hello packets that are sent and received).
To view specific information, enter one of the following optional
parameters:
• interface: Enter the type of interface and slot/port information to
view IS-IS information on that interface only.
debug isis
local-updates
[interface]
EXEC Privilege View information about IS-IS local update packets.
To view specific information, enter one of the following optional
parameters:
• interface: Enter the type of interface and slot/port information to
view IS-IS information on that interface only.
debug isis snp-packets
[interface]
EXEC Privilege View IS-IS SNP packets, include CSNPs and PSNPs.
To view specific information, enter one of the following optional
parameters:
• interface: Enter the type of interface and slot/port information to
view IS-IS information on that interface only.
debug isis spf-triggers
EXEC Privilege View the events that triggered IS-IS shortest path first (SPF) events
for debugging purposes.
debug isis
update-packets
[interface]
EXEC Privilege View sent and received LSPs.
To view specific information, enter one of the following optional
parameters:
• interface: Enter the type of interface and slot/port information to
view IS-IS information on that interface only.