Tuning And Optimizing Is-Is Networks; Configuration Prerequisites; Specifying Intervals For Sending Is-Is Hello And Csnp Packets; Specifying The Is-Is Hello Multiplier - HP MSR2000 series Configuration Manual

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, and make adjacent nodes can reach each other at the
•
network layer.
• Enable IS-IS.

Specifying intervals for sending IS-IS hello and CSNP packets

Step
1. Enter system view.
2. Enter interface view.
3. Specify the interval for
sending hello packets.
4. Specify the interval for
sending CSNP packets on the
DIS of a broadcast network.
NOTE:
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 multiplied by the hello
interval.
On a broadcast link, Level- 1 and Level-2 hello packets are advertised separately; therefore, you need to
set a hello multiplier for each level.
On a P2P link, Level- 1 and Level-2 hello packets are advertised in P2P hello packets, so 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 number of hello packets a
neighbor must miss before declaring
the router is down.
Command
system-view
interface interface-type
interface-number
isis timer hello seconds [ level-1 |
level-2 ]
isis timer csnp seconds [ level-1 |
level-2 ]
Command
system-view
interface interface-type
interface-number
isis timer holding-multiplier value
[ level-1 | level-2 ]
148
Remarks
N/A
N/A
Optional.
10 seconds by default.
Optional.
10 seconds by default.
Remarks
N/A
N/A
Optional.
3 by default.