From: Bob Sinclair (bsin@xxxxxxxxx)
Date: Wed Apr 17 2002 - 20:23:04 GMT-3
Tarek,
Very helpful ascii thing! I would suggest that you should have two virtual lin
ks. One from R4 to R2 and one from R4 to R3. It might well work with just one
, but what if the router you choose for the link fails? Area 2 would be strand
ed. Also, if there are other routers in Area 2 you might find that having only
one virtual link leads to inefficient paths.
My two cents,
Bob
----- Original Message -----
From: "Tarek Sabry" <tsabry@houston.sns.slb.com>
To: "'Wade Edwards'" <wade.edwards@powerupnetworks.com>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, April 17, 2002 6:52 PM
Subject: RE: Virtual Links
> Wade
>
> No I don't have 2 different transit areas. Just area 1 is a transit area. Do
> I still need 2 virtual links???? There's a LAN between r2 and r3. I made a
> silly ASCII thing here that I hope will show up in e-mail.
>
> -------(area 1)------(r2)-----(area 2)
> /
> (area 0 )----(r4)--------
> \
> --------(area 1)------(r3)-----(area 2)
>
> Thanks
> Tarek
>
> -----Original Message-----
> From: Wade Edwards [mailto:wade.edwards@powerupnetworks.com]
> Sent: Wednesday, April 17, 2002 5:32 PM
> To: Tarek Sabry
> Cc: ccielab@groupstudy.com
> Subject: RE: Virtual Links
>
>
> You have to have two virtual links. If you have two routers and there
> are two paths through two different transit areas you will need to have
> two virtual links between those two routers. One through each transit
> area.
>
> I always thought if you have authentication on OSPF area 0 then you need
> to have that specified on the virtual-link because the virtual-link is
> part of area 0, which has authentication. If you had to take off the
> MD5 authentication from the virtual-link in order to get the
> virtual-link to come up what is the purpose of the command on the
> virtual-link.
>
> I guess it must be YAIB (Yet Another IOS Bug).
>
> L8r.
>
> -----Original Message-----
> From: Tarek Sabry [mailto:tsabry@houston.sns.slb.com]
> Sent: Wednesday, April 17, 2002 4:59 PM
> To: ccielab@groupstudy.com
> Subject: Virtual Links
>
> Hi
>
> This is a quick one. When I have 2 spokes that can act as ABRs between
> area
> 1 and area 2 let's say, do I need 2 virtual links to area 0? Or should I
> only have one virtual link that I choose?
>
> Another question, if area 0 is authenticated then do I have to enable
> authentication on the virtual link? I thought I should, but the only way
> I'm
> able to bring one of the virtual links up is to remove the md5
> authentication!! Is there a problem because I'm using 2 parallel VLinks
> or
> this is the way it is supposed to work?
>
> Thanks
> Tarek
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