From: P729 (p729@xxxxxxx)
Date: Thu Jul 25 2002 - 02:18:24 GMT-3
The problem occurs when the "demand circuit" is also known to the
redistributed protocol. When it flaps, the redistributed protocol withdraws
the route and round-and-round she goes...
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: "Bruce Williams" <bruce@williamsnetworking.com>
To: "Joe A" <GroupStudy@comcast.net>; "'Donny MATEO'"
<donny.mateo@sg.ca-indosuez.com>
Cc: <ccielab@groupstudy.com>; "'Ivan'" <limmt@lycosasia.com>;
<nobody@groupstudy.com>
Sent: Wednesday, July 24, 2002 5:36 AM
Subject: RE: OSPF keeps bringing up DDR across asyn line
> I have a question about this. Once the redistributed routing protocol is
> redistributed, will it keep on sending LSAs about the redistributed routes
> every time the redistributed routing protocol sends and update. I would
> assume that it would not have to send LSAs every time because the
> information is not new. LSAs are sent when something changes. If that is
not
> correct, please explain.
>
> Bruce
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Joe A
> Sent: Tuesday, July 23, 2002 11:51 PM
> To: 'Donny MATEO'
> Cc: ccielab@groupstudy.com; 'Ivan'; nobody@groupstudy.com
> Subject: RE: OSPF keeps bringing up DDR across asyn line
>
>
> The issue in using a demand circuit in area 0 is that EVERYTHING must get
> flooded into area 0. Check out page 801 in the Solie book, Area 0
> Guidelines. Also check out page page 498 paragraph 3 in the same book.
>
> Redistributing into OSPF certainly can cause a demand circuit to flap.
> Remember, a demand circuit suppresses hellos, not LSAs. And all LSAs get
> flooded into area 0, so the link is going to flap up and down in 'sync'
with
> the redistributed routing protocol's periodic updates.
>
> - Joe
>
> -----Original Message-----
> From: Donny MATEO [mailto:donny.mateo@sg.ca-indosuez.com]
> Sent: Tuesday, July 23, 2002 12:43 AM
> To: Joe A
> Cc: ccielab@groupstudy.com; 'Ivan'; nobody@groupstudy.com
> Subject: RE: OSPF keeps bringing up DDR across asyn line
>
>
>
> I'm affraid I dont' quite understand this. I have a perfectly running
> demand circuit under area 0 and it's not a stubby area either.
> What's the issue of using demand circuit under area 0 ?As far as I know is
> that if your topology is stable that it shouldn't have triggered the line.
> If changing your area into totally stub area solve the problem , perhaps
> it's because you have an unstable topology in the first place.
>
> Donny
>
>
>
> Joe A
> <GroupStudy@comca To: "'Ivan'"
> <limmt@lycosasia.com>
> st.net> cc:
> ccielab@groupstudy.com
> Sent by: Subject: RE: OSPF keeps
> bringing up DDR across asyn line
> nobody@groupstudy
> .com
>
>
> 23-07-2002 12:09
> Please respond to
> Joe A
>
>
>
>
>
>
> You could've also done a route filter to stop the distance vector protocol
> from causing an LSA. Another message referenced an unstable IGP, but
don't
> think that is always the case - the LSA is probably generated by the
normal
> periodic advertisments that would still happen in a completely stable
> environment.
>
> -----Original Message-----
> From: Ivan [mailto:limmt@lycosasia.com]
> Sent: Monday, July 22, 2002 11:30 PM
> To: GroupStudy@comcast.net
> Cc: ccielab@groupstudy.com
> Subject: RE: OSPF keeps bringing up DDR across asyn line
>
>
> Hi,
>
> Yes, its correct.
> I've changed the area 10 where the dialer interface is in into a totally
> stubby area and that solves the issues.
>
> Thanks
> Ivan Lim
>
>
> -----Original Message-----
> From: "Joe A" <GroupStudy@comcast.net>
> Sent: Tuesday, July 23, 2002 10:50 AM
> To: "'Ivan'" <limmt@lycosasia.com>, "ccielab@groupstudy.com"
> <ccielab@groupstudy.com>
> Subject: RE: OSPF keeps bringing up DDR across asyn line
>
> It might be because you are redistributing a distance vector protocol into
> OSPF, which generates an LSA over the link at each update period.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Ivan
> Sent: Monday, July 22, 2002 8:16 AM
> To: ccielab@groupstudy.com
> Subject: OSPF keeps bringing up DDR across asyn line
>
>
> Hi,
>
> I've configured AUX back to back to simulate DDR across ISDN.
> I've also configure it as a IP OSPF Demand Circuit.
>
> However OSPF continues to bring up the link.
> The link is under an OSPF area 10.
>
> The debug dialer shows the reason for the link being bring up:
> -------------------------------------------------------------
> Mar 4 03:59:57.249 EST: As1 DDR: rotor dialout [priority]
> Mar 4 03:59:57.253 EST: As1 DDR: Dialing cause ip (s=110.99.25.2,
> d=224.0.0.5)
> Mar 4 03:59:57.257 EST: As1 DDR: Attempting to dial 1234
> Mar 4 03:59:57.257 EST: CHAT1: Attempting async line dialer script
> Mar 4 03:59:57.261 EST: CHAT1: Dialing using Modem script: isdn & System
> script
> : none
> Mar 4 03:59:57.269 EST: CHAT1: process started
> Mar 4 03:59:57.269 EST: CHAT1: Asserting DTR
> Mar 4 03:59:58.197 EST: CHAT1: Chat script isdn started
> Mar 4 03:59:58.201 EST: CHAT1: Chat script isdn finished, status =
Success
> MU-R2#
>
> ----------------------------------------------------------------
>
> Since the hello is suppressed over the point to point dialer link,
> I'm not sure what OSPF is sending out on the all router multicast address
> across the dialer interface. The other reason i can think of is when a
> topology change that trigger the link but there is none.
>
> Appreciate if anyone can advice on this.
>
> Thanks
> Ivan Lim
>
> ------------------------------------------------------------------------
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