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Tuning and optimizing IS-IS networks
Configuration prerequisites
Before you tune and optimize IS-IS networks, complete the following tasks:
•
Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
•
Enable IS-IS.
Specifying the interval for sending IS-IS hello packets
If a neighbor does not receive any 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 multiplied
by the hello interval.
To specify the interval for sending hello packets:
Step
1.
Enter system view.
2.
Enter interface view.
3.
Specify the interval for
sending hello packets.
Specifying the IS-IS hello multiplier
The hello multiplier is the number of hello packets a neighbor must miss before it declares that the
router is down.
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 multiplied by the
hello interval.
On a broadcast link, Level-1 and Level-2 hello packets are advertised separately. You must set a
hello multiplier for each level.
On a P2P link, Level-1 and Level-2 hello packets are advertised in P2P hello packets. You do not
need to specify Level-1 or Level-2.
To specify the IS-IS hello multiplier:
Step
1.
Enter system view.
2.
Enter interface view.
3.
Specify the hello multiplier.
Command
system-view
interface interface-type
interface-number
isis timer hello seconds [ level-1
| level-2 ]
Command
system-view
interface interface-type
interface-number
isis timer holding-multiplier value
[ level-1 | level-2 ]
150
Remarks
N/A
N/A
The default setting is 10 seconds.
The interval between hello packets
sent by the DIS is 1/3 the hello
interval set with the isis timer
hello command.
Remarks
N/A
N/A
The default setting is 3.
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Troubleshooting
