From: Alejandro Cadarso (a.cadarso@xxxxxxxxxxxxxx)
Date: Tue Apr 17 2001 - 10:48:57 GMT-3
Of course Always there is a layer 3 answer, In my case is that OSPF
generates a external LSA "Dial reason: ip (s=172.16.17.1, d=224.0.0.5)"
because the command: " redistribute rip subnets route-map rip2ospf " in
OSPF router configuration, is working in a different way in 12.0 and 12.1
All the problem came from the fact that all the interfaces of this
router are in the same mayor network, and the strange behaviour that:
even when you declare a interface passive and you have all routes for
each interface connected, as you enable RIP, EIGRP or IGRP for the
entire major network when you redistribute RIP, EIGRP or IGRP into
OSPF, it kinda fools OSPF into thinking that i am getting this network
from RIP, EIGRP or IGRP too ( even though its a connected network )
In 12.0 this external LSA is not being generated because of the route
map (as I think must be) but in 12.1 is generated.
Anybody knows the reason?
Chris Mott wrote:
> CDP is Layer 2, and thus incapable of triggering the dialer-list, which is
> Layer 3 ... I do not know where this thought started, but there is _always_
> a reason that your ISDN circuit comes up via a Layer 3 answer ... proper
> filtering and judicious use of dialer-lists will fix it ... watch your
> debugs, and for goodness sake watch your redistribution!
>
> One trick I like to use is to set the dialer idle-timeout to about 10-15
> seconds, which will enable the ISDN connection to shut off in plenty of time
> after a triggered event ... then by watching the time split of the triggered
> events, in conjunction with debug dialer and an understanding of the
> redistribution required, I can quickly "spot the issue" (sorry Bruce) ...
>
> if you follow this advice, don't forget to change the idle-timeout back to
> the default before moving on, especially with IPX DDR, as 10-15 seconds is
> not long enough for IPX RIP to pass traffic, and it'll bite cha!
>
> 22 days to San Jose!
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> simplimarvelous
> Sent: Tuesday, April 17, 2001 5:43 AM
> To: Alejandro Cadarso; ccielab
> Subject: Re: OSPF On Demand Circuit in Area 0 & RIP,IGRP or EIGRP
> redistribition
>
>
> All
>
> In all of these scenerios, has anyone tried turning of CDP "no cdp enable "
> on the interface that would be used for dialing, cdp broadcasts will also
> bring the link up mysteriously"
>
> Gerald
>
> ----- Original Message -----
> From: "Alejandro Cadarso" <a.cadarso@uniway-tec.com>
> To: "ccielab" <ccielab@groupstudy.com>
> Sent: Tuesday, April 17, 2001 1:54 AM
> Subject: OSPF On Demand Circuit in Area 0 & RIP,IGRP or EIGRP redistribition
>
>
>> Hi,
>>
>> I've been working In this so much commented scenario.
>>
>> I always manage to keep the Dialer interface down filtering in the ospf
>> process the redistribution from the other routing protocol with route
>> maps avoiding the
>>
>> IP route from the RIP, IGRP or EIGRP process on the ppp dialer link out of
>
> the redistribution.
>
>> My question is: anybody knows if this behaviour change in 12.1 versions?,
>
> I've tried the scenario with the three routing protocols in a 1750 with
> 12.1(7) standard track IOS version and the ppp link flaps because the:
>
>> "OSPF: Generate external LSA" brings up the link even when I have a route
>
> map to filter it. I also tried:
>
>> distribute-list X out ospf 1 in the igrp, eigrp or rip protocol and it
>
> doesn't filter it either.
>
>> I've been navigating through the IOS software bug toolkit and I can't find
>
> any bug related.
>
>> Regards,
>>
>> Alejandro Cadarso.
>> **Please read:http://www.groupstudy.com/list/posting.html
>
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