Routing protocol on two interfaces seperated by another ip network
Is it possible to run eigrp, rip, or ospf process on two router interfaces that are seperated by an ip network of routers that don't participate in the process ? Just to know if the end to end connectivity goes down somewhere in the path. I have heard this is only possible with BGP using private ASN's at each end.
Re: Routing protocol on two interfaces seperated by another ip n
You can do this using either an interior gateway protocol (i.e., EIGRP, RIP, etc) through a GRE tunnel or directly via BGP. The BGP can be configured as EBGP or IBGP, whichever fits in with your other uses of BGP (if none, IBGP, that is, both ends in the same ASN, is easier to work with). Similarly, unless you need BGP for multihoming as well, any private ASN would work fine (or even a public one you don't own, but that is a different issue... might as well plan ahead :-).
FWIW: This is the same problem as occurs with routing over a VPN. See the "Redundant Routes in IPsec VPNs" white paper on my web site for examples of both approaches.
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