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HP 5500 EI series Configuration Manual: Tuning And Optimizing Is-is Networks

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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.
Enter interface view.
2.
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.
Command
system-view
interface interface-type
interface-number
isis timer hello seconds [ level-1 |
level-2 ]
Command
system-view
interface interface-type
interface-number
137
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

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