From: xander (xander@xxxxxx)
Date: Thu Apr 12 2001 - 04:03:53 GMT-3
Hello Corey,
Let me try to do it by following example:
Imagine, R1 - R2 comunicate through FR and have ISDN backup interface
configured as on-demand circuit for OSPF. There is some redistributing
process from time-period based classfull routing protocols flooded
into OSPF at one of the other router, it does not matter where...
These routes have external type for OSPF and they do not suppressed by
ip ospf on-demand-circuit command. And you have 'dialer-list 1 permit
protocol ip' on R1 or R2, as see as which one dials to another.
Well... You get interface flapping, if idle-timeout is less than
periodic updates, or never-shutted dialup lines :-)))
SOLUTION IS:
dialer-list 1 protocol ip 101
access-list 101 deny ospf any any
access-list 101 permit ip any any
-- WBW, xander mailto:xander@adt.ru CCNA, CCNP+VoiceAccess, CCIE first attempt in Brussels 19-20, April, 2001...
CME> I kind of understand what this scenario is concerning LSA's keeping the li ne CME> up, but can someone explain it, and provide the typical solution for the CME> scenario. Passive-Interfaces only suppress Hello's not all LSA's so I CME> suppose some kind of filtering. If someone could explain I would greatly CME> appreciate it.
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