Re: dialer watch-list - please help !!

From: Joe Rothstein (ziutek@mac.com)
Date: Fri Aug 20 2004 - 11:12:13 GMT-3

Hey Marc,

I think you are making this much more complicated than need be.

First, there is no need to block the route you are watching from
re-entering the routing table. It should re-enter the routing table.
Dialer watch is smart enough to know that this was learned from a
backup source and will not bring the link down because it is now once
again in the routing table.

Second, I don't think it is possible to have a virtual-link run
exclusively over an ISDN link, and not over a FR link if ytou have
parallel connections between R4 and R5. After all, the vir link is
using the router ID's of the two sides of the connection, and nothing
related to the IP addresses of the ISDN link.

Are you running demand circuit over the link as well? Do you have
neighbor relationship established over the ISDN? If your R5 has two
routes to the BB (area 0), then you can change the ip ospf cost on the
ISDN so that traffic will prefer the FR once it returns.

Just curious, which workbook is this scenario from?

Joe

On Friday, Aug 20, 2004, at 15:39 Europe/Berlin, marc van hoof wrote:

> Yes, because R5 is an ABR for area 0, 45, 345
>
> It's basically so that if R5 loses it's connection to the FR cloud,
> we'd
> need to prevent area 345 from being a standalone area...
>
> So the frame relay cloud between R3,R4,R5 is area 345, and the isdn
> between
> R4,R5 is area 45. area 0 is R5 and SW2.
>
> If R5 lost it's connection to area 345, then it would be area 0 SW2,
> R5 -
> area 45 R5, R4 - area 345 R4, R3.
>
>
>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>> Of
>> gladston@br.ibm.com
>> Sent: Friday, 20 August 2004 11:05 PM
>> To: ccielab@groupstudy.com
>> Subject: Re: dialer watch-list - please help !!
>>
>> After drawing your net, one question:
>>
>> R4 is connecte to R5 through serial 0 and through BRI0/0;
>> Serial 0 is on Area 345;
>> BRI 0/0 is on Area 45;
>> There is a virtual link over ISDN but there is no virtual link over
>> serial
>> 0.
>>
>> If the network is correct, is there any reason to have a virtual link
>> over
>> the ISDN and not having also through Serial?
>>
>> =========================
>> quoted:
>>
>> router ospf 1
>>
>> router-id 150.2.4.4
>>
>> max-metric router-lsa on-startup 600
>>
>> log-adjacency-changes
>>
>> area 45 virtual-link 150.2.5.5 authentication message-digest
>>
>> area 45 virtual-link 150.2.5.5 message-digest-key 1 md5 CISCO
>>
>> area 45 virtual-link 150.1.5.5
>>
>> network 142.2.0.4 0.0.0.0 area 345
>>
>> network 142.2.45.4 0.0.0.0 area 45
>>
>> network 150.2.4.4 0.0.0.0 area 45
>> ===========================
>>
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--
There is more to life than increasing its speed. - Mahatma Ghandi

Joseph Rothstein
Ridlerstr. 32
80339 Munich
Germany

ziutek@mac.com
http://www.geocities.com/jozek444
http://www.rothstein.no-ip.org/
http://waywardgenuses.blogspot.com/
http://ziutek.journalspace.com/

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