From: radha rani (radhaccie@xxxxxxxxxxx)
Date: Tue Oct 03 2000 - 12:16:10 GMT-3
Hi. I have a slightly different question regarding ospf-igrp
redistribution. I apologize if this has been answered already. I
didn't quite find it in the archives.
As I understand it, in order to get to variably subnetted networks in
the OSPF domain, we need to inject a default network into the IGRP
domain. The default network needs to be a network address other than
the classful address being used on the link between the two domains.
Another option would be to use a staitc route on the IGRP router.(I
hope I'm right so far - is there another method??)
I am working on a scenario where the instructions tell me to use **only
the 170.100.x.x class-b network everywhere** and I can't use any static
routes. In this case, how can I establish reachability from the IGRP
domain to various (variably subnetted) networks outside this domain?
Now I have a second question related to BGP: (it ties in with the
situation above, that's why I'm asking here)
OSPF net ------ R4 ------igrp------ R2--------ebgp-------R8
Lets say I went ahead and configured a different class-b net on R4 and
injected a default-network into R2. R2 can now successfully ping
170.100.8.2/27.
My next challenge is to advertise a supernet 170.0.0.0 from R2 to R8.
I do this with an aggregate-address on R2. This creates a static route
to null0 in R2's routing table (as expected). The problem is - now I
can't ping the address 170.100.8.2/27 from R2 because the packet is
being routed to the null interface on R2. Having a gateway of last
resort is useless as the 170.0.0.0 route is in the routing table. How
can R2 ping the variably subnetted addresses in the OSPF domain?
I appreciate any help you guys can provide. Thanks in advance.
-Radha
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