Re: how to make ospf demand-circuit calm?

From: Sage Vadi (sagevadi@yahoo.co.uk)
Date: Mon Jan 06 2003 - 07:53:32 GMT-3


Fan,

I have noticed that "ip ospf demand-circuit" can act
differently 'pending the version of IOS that is in
use.

I personally have noticed multicasts being sent out
periodically, to the other ISDN end point (debug
dialer packets/events).

There are a few ways around this. I will give one easy
way (I am sure many others will follow with their own
variations.) -

1.) permit ICMP only as the "trigger" for interesting
traffic. Once the link is up it can send multicasts
and will form OSPF neighbor.

Eg:

Int Config:
interface BRI0
dialer-group 1 <-- link me to dialer-list1

Global Config:
access-list 111 permit icmp any any <-- ICMP only
access-list 111 deny ip any any <-- nothing else

dialer-list 1 protocol ip list 111 <-- refer ACL111

Hope it helps,
Cheers,
Sage



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