OSPF, Default Routes, and maybe a little tagging.

From: Kelly Cobean (kcobean@earthlink.net)
Date: Tue Jan 14 2003 - 19:29:06 GMT-3

Hey all, I'm wondering about some behavior that I'm seeing on my routers
that I don't understand. I have two routers on different networks
originating default-information into my OSPF domain. Further down in my
network, but equal distance (cost) from both of these originating routers, I
have a router that shows only a single path in the routing table to the
default route. The metric-type is E2, and advertisements of 0.0.0.0 from
both routers are in the downstream routers OSPF database, but only one is
making it in to the routing table. The downstream router is in a different
area (Area 1) from routers injecting the default (Area0). Any ideas as to
why only one of the default routes is making it into the routing table?
Below is some simple ASCII to show the setup.

BGP
-------R1 --F/R PTP Link-- R2 R1/R2 are ASBR's sending 0.0.0.0 into
Area0
OSPF | | Links from R1->Rx and R2->Ry are Fast
ether.
        | |
        Rx Ry Rx/Ry are ABR's connecting Area 0 to Area
1
          \ /
           \ /
            \ /
             \ /
              \ /
               \ /
       s0.100 | | s0.200 Rg has PVC to Rx, PVC to Ry, both in Area
1
               - Rg - both are 256K.

Any input appreciated. Thanks.
Kelly Cobean
.

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