On Sat, 9 Oct 2010, Smith W. Stacy wrote:
I think you misunderstood. My example in no way requires virtual/logical
routers. I simply used them because I only had access to a single
physical router and wanted to create a more complex topology to verify
the solution to your redistribution question.
The only configuration necessary is on abr1 and abr2.
The other routers in my topology (ospf1, ospf2, isis1, and isis2) were
simply to verify the redistribution on abr1 and abr2 was working
correctly. ospf1 and ospf2 are OSPF-only speaking routers. isis1 and
isis2 are ISIS-only speaking routers.
--Stacy
Stacy,
Oh, I understood you completely.
In fact, you didn't know it, but the idea of virtual/logical routers is a
more elegant solution in my case. In my case, abr1 and isis1 are but one
physical router -- same for abr2 and isis2. My only problem is the issue
of stealing bandwidth from the MX PFEs to support 10Gig logical tunnels.
On the isis-only speaking routers (isis1 and isis2), getting transit
traffic to go where I want it to go via abr1 or abr2 is easy. The
problem, for example, is with traffic coming in from some *other*
isis-only router, isis3, via abr2. In this case, physically isis3 must
pass traffic through abr2 to get to abr1. I want that traffic to transit
through abr1-ospf1 to the OSPF world, but since ospf internal routes have
a better preference over isis routes, it will take the abr2-ospf2 path
when it hits abr2, even though the metric from isis is engineered to be
better going through the isis domain via abr1.
In other words, dropping in a separate abr1 and abr2 router between the
ospf and isis worlds is a lot cleaner -- but it costs me something in
terms of bandwidth resources to support the logical tunnels.
Does that clarify my challenge a bit?
P.S. I just wish the vendor of my OSPF-only routers would support ISIS in
a virtual routing environment. Life would be simpler :-)
Clarke
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