Reference Guide

880 | Intermediate System to Intermediate System (IS-IS)
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Usage
Information
Because the default establishes Level 1 and Level 2 adjacencies, you do not need to configure this
command. Routers in an IS-IS system should be configured as a Level 1-only, Level 1-2, or Level
2-only system.
Only configure interfaces as Level 1 or Level 2 on routers that are between areas (for example, a Level
1-2 router) to prevent the software from sending unused hello packets and wasting bandwidth.
isis csnp-interval
e
Configure the IS-IS complete sequence number PDU (CSNP) interval on an interface.
Syntax
isis csnp-interval seconds [level-1 | level-2]
To return to the default values, enter the no isis csnp-interval [seconds] [level-1 | level-2]
command.
Parameters
Defaults
seconds = 10; level-1 (if not otherwise specified)
Command Modes
INTERFACE
Command
History
Usage
Information
The default values of this command are typically satisfactory transmission times for a specific interface
on a designated intermediate system. To maintain database synchronization, the designated routers
send CSNPs.
Level 1 and Level 2 CSNP intervals can be configured independently.
isis hello-interval
e
Specify the length of time between hello packets sent.
Syntax
isis hello-interval seconds [level-1 | level-2]
To return to the default values, enter the no isis hello-interval [seconds] [level-1 | level-2]
command.
seconds
Interval of transmission time between CSNPs on multi-access networks for the designated
intermediate system.
Range: 0 to 65535
Default: 10
level-1
(OPTIONAL) Independently configures the interval of time between transmission of CSNPs
for Level 1.
level-2
(OPTIONAL) Independently configures the interval of time between transmission of CSNPs
for Level 2.
Version 8.3.12.0 Introduced on S4810