1-23
Tuning and Optimizing IS-IS Networks
Configuration Prerequisites
Before the configuration, accomplish the following tasks:
z
Configure IP addresses for interfaces, and make adjacent nodes reachable to each other at the
network layer.
z
Enable IS-IS.
Specifying Intervals for Sending IS-IS Hello and CSNP Packets
Follow these steps to configure intervals for sending IS-IS hello and CSNP packets:
To do…
Use the command…
Remarks
Enter system view
system-view
––
Enter interface view
interface
interface-type
interface-number
––
Specify the interval for sending
hello packets
isis timer hello seconds
[
level-1
|
level-2
]
Optional
10 seconds by default
Specify the interval for sending
CSNP packets on the DIS of a
broadcast network
isis timer csnp seconds
[
level-1
|
level-2
]
Optional
10 seconds by default
The interval between hello packets sent by the DIS is 1/3 the hello interval set with the
isis timer hello
command.
Specifying the IS-IS Hello Multiplier
If a neighbor receives no hello packets from the router within the advertised hold time, it considers the
router down and recalculates the routes. The hold time is the hello multiplier times the hello interval.
Follow these steps to specify the IS-IS hello multiplier:
To do…
Use the command…
Remarks
Enter system view
system-view
––
Enter interface view
interface
interface-type
interface-number
––
Specify the number of hello packets a
neighbor must miss before declaring
the router is down
isis timer holding-multiplier
value
[
level-1
|
level-2
]
Optional
3 by default
