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Re: (ASCEND) OSPF and Area Border Router on Max

Matt,

There's a difference between not recommending something, and something
not being possible.

By reading the manual I understood that the Max COULD be an ABR, you 
even went so far as to draw a diagram showing exactly what the topology
would look like, WITH MAXES!  

I'm just trying to verify how this would work on a Max.  My understanding
now from you is that the Max CANNOT be a ABR.  Is this accurate?

That said, does Ascend have a discussion somewhere of how they 
recommend the implementation of OSPF on the Maxes, from a topology 
standpoint?

I know there are lots of people running OSPF on their Maxes, I'm beginning
to migrate our network from RIP/Static Routes to OSPF.  My topology had
the Ascends as Area Border Routers.  What are other people doing?

Here's the topology I built:

                                                               
                                                               RTR#1  RTR #2
                                                               |  |   |  |
                                                               |  |   |  |
20 Net Switch Card (10 Mb) |-------*--*--*--*--*--*--*--*--*---*--)---*--)--|
                                   |  |  |  |  |  |  |  |  |      |      |
                                Max 400X Modem Pool (9 hosts)     |      |
                                                                  |      |
                                                                  |      |
21 Net Switch Card (10 Mb) |-------*-*-*-*-*-*-*-*-----*-*-*-*----*------*--|
                                   | | | | | | | |     | | | |       
                                   | | | | | | | |     Max TNT       
                                Max 400X Modem Pool (8 hosts)        

I was planning on making the 20 and 21 Net Switch Cards Area 0.
Then I was going to pair up Ascend Maxes, assign each a /25 subnet, and 
put their WAN interfaces in the same Area.

However, that would require the Ethernet port of the Max to be in a different
Area than the WAN ports.

My only other question would be:  If they can't be ABRs, than the Maxes 
can only be Stub Area routers?

Oh well.  Thanks for all the help.

-Rob

On Wed, 1 Oct 1997, Matt Holdrege wrote:

> At 07:43 AM 10/1/97 -0400, Robert A. Pickering Jr. wrote:
> >OSPF Users,
> >
> >How can you make a Max be an Area Border Router?
> >In designing our OSPF network, I'd like to make the 
> >Maxes all part of Area 0, with my core routers, but put all
> >the WAN ports for the Maxes in seperate areas.  That way I won't
> >get the route updates for the WAN ports propogated through Area 0.
> >OSPF should summarize the networks that are assigned there, and 
> >keep the individual link-state announcements about all the /32's
> >to itself.
> >
> >However, I don't see anywhere on the Max, or in the docs, or on the
> >web site, that leads me to believe this is possible.  The Area assignment
> >appears to be for the box, not for the interfaces as I'd expect.
> 
> Somewhere in the DOC's we say that we do not recommend this. The Max is
> simply not a backbone router and as such, does not support ABR functionality.
> 
> Matt Holdrege  -  http://www.ascend.com  -  matt@ascend.com
> 

-- 
Robert A. Pickering Jr.                Internet Services Manager
Cincinnati Bell Telephone              rob@fuse.net

           A Rough Whimper of Insanity (Information Superhighway)

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