Reference Guide
Intermediate System to Intermediate System (IS-IS) | 909
debug isis spf-triggers
e 
Enable debugging on the events that triggered IS-IS shortest path first (SPF) events for debugging 
purposes.
Syntax
debug isis spf-triggers
To turn off debugging, enter no debug isis spf-triggers.
Command Modes
EXEC Privilege
Command
History
debug isis update-packets 
e 
Enable debugging on Link State PDUs (LSPs) that are detected by a router. 
Syntax
debug isis update-packets [interface] 
To turn off debugging, enter the no debug isis update-packets [interface] command.
Parameters
Command Modes
EXEC Privilege
Command
History
Version 8.3.12.0 Introduced on S4810
Version 6.3.1.0 Introduced
Version 8.3.19.0 Introduced on S4820T
Version 8.3.12.0 Introduced on S4810
Version 6.3.1.0 Introduced
interface
(OPTIONAL) Identifies the interface type slot/port as one of the following: 
• For a 1-Gigabit Ethernet interface, enter the keyword 
GigabitEthernet followed 
by the slot/port information. 
• For a Port Channel interface, enter the keyword port-channel followed by a 
number:
C-Series and S-Series Range: 1-128
E-Series Range: 1 to 32 for EtherScale, 1 to 255 for TeraScale and 1 to 512 for 
ExaScale. 
• For a SONET interface, enter the keyword 
sonet followed by the slot/port 
information. 
• For a 10-Gigabit Ethernet interface, enter the keyword 
TenGigabitEthernet 
followed by the slot/port information. 
• For a VLAN, enter the keyword 
vlan followed by a number from 1 to 4094.
Version 8.3.19.0 Introduced on S4820T
Version 8.3.12.0 Introduced on S4810
Version 6.3.1.0 Introduced










