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Community Member

How to verify and change the timer of IS-IS?

Hi All,

I had tried to find document but I can not find the answer. Does any body know the IS-IS timer in Cisco router and Can I change it? So far I just can find command to change the IS-IS interface metric.

Best Regards

Teru Lei

3 REPLIES
Silver

Re: How to verify and change the timer of IS-IS?

The timers are:

Hello - 10 seconds - changed via isis hello-interval command

Hold Time - 30 seconds (3 x Hello Interval) - changed via isis hello-multiplier command

LSP Retransmission timer - 5 secinds - changed via isis retransmisit-interval command

CSNP timer - 10 seconds - changed via isis csnp-inteval command

The IS-IS Max Age is 20 minutes

LSP refresh interval is 15 minutes

Zero Age timer is 60 seconds

Community Member

Re: How to verify and change the timer of IS-IS?

Hi,

Thank you for your reply. May I ask you one more question? Do the timer change in different type interface? or the timer do not change? If the timer do not change, why a point-to-point interface can not form neighbor with a multipoint interface? Thank You!

Best Regards

Teru Lei

Silver

Re: How to verify and change the timer of IS-IS?

Two different types of Hello are used in ISIS, Point to Point Hello's and LAN (or Broadcast) Hello's (and the LAN Hello's are subdivided into two more types- Level-1 and Level-2).

Neighbors are requires to use the same type of Hello's. A Multipoint interface will use a LAN (or Broadcast) Hello and a Point to Point interface will use a Point to Point Hello, in this case no neighbor relashonship will be formed as there is a Hello type mismatch.

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