From: Tarek Sabry (tsabry@xxxxxxxxxxxxxxxxxxx)
Date: Wed Apr 17 2002 - 22:12:17 GMT-3
Bob
I fully agree. But now how does this really work? To start with everything
looks good and I have both virtual links up, but after "some time" like an
hour or two or so, one of the links goes into Exstart and stays as such
until I reboot the router! What's interesting is that it also comes up if
instead of rebooting it I reboot the other spoke router!!! Now I would like
to know if this is normal behaviour after all. Is this due to the fact that
virtual links are demand circuits thereby after some time one of them goes
down, and staying there as standby untill the other guy fails? I never heard
about such a thing. If any of you has any thoughts or can simply try it out
I'd surely be very appreciative.
Thanks
Tarek
-----Original Message-----
From: Bob Sinclair [mailto:bsin@erols.com]
Sent: Wednesday, April 17, 2002 6:23 PM
To: Tarek Sabry
Cc: ccielab@groupstudy.com
Subject: Re: Virtual Links
Tarek,
Very helpful ascii thing! I would suggest that you should have two virtual
links. 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 stranded. 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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