Reference Guide

Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
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.
You can configure Level 1 and Level 2 CSNP intervals independently.
isis hello-interval
Specify the length of time between hello packets sent.
S4820T
Syntax
isis hello-interval seconds [level-1 | level-2]
To return to the default values, use the no isis hello-interval [seconds]
[level-1 | level-2]
command.
Parameters
seconds Allows you to set the length of time between hello packet
transmissions. The range is from 1 to 65535. The default is 10.
level-1 (OPTIONAL) Select this value to configure the hello interval for Level
1. This value is the default.
level-2 (OPTIONAL) Select this value to configure the hello interval for Level
2.
Defaults seconds = 10; level-1 (if not otherwise specified)
Command Modes INTERFACE
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
Usage
Information
Hello packets are held for a length of three times the value of the hello interval. To conserve
bandwidth and CPU usage, use a high hello interval seconds. Use a low hello interval seconds
for faster convergence (but uses more bandwidth and CPU resources).
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