I don't think the second solution would work to well if you tried to put all
of the interfaces in the same network space, but 1 and 3 should be ok.
I'm not too sure where the worry about load balancing comes in since each
router only has one direct hop to the other. There should only be one link
to a destination at a time in this design. If a link goes down, it will
take the two-hop route.
The meshed frame-relay solution is how we do it where I work, but PTP versus
FR is mostly a matter of cost and what you need the circuit to do.
>
>here is the design:
>
>
> ETHERNET
> |
> 1XXX
> XXXX
> / \
> / \
> 2XXX 3XXX
> XXXX-----XXXX
> / \
> ETHERNET ETHERNET
>
>
>the three routers are seperated by point to point wan
>links, my questions involve the pros/cons of
>addressing the wan links using various techniques.
>
>1. make each p2p link its own /30 network
>2. make all p2p links use addresses out of the same
>pool (i.e. 10.0.0.1, .2, .3, .4, .5, .6)
>3. ip unnumbered e0
>
>i think that solutions 2 & 3 would cause problems if
>one link came down, because only a portion of the
>subnet is down.... if you were doing per packet load
>balanceing, then every other packet would drop...
>
>
>as a variation, you colud take the link down between
>routers 2 & 3, and make the other p2p's frame relay
>links, then have a logical full mesh using pvc's...
>
>
>Comments please..
>
>
>
>=====
>ciscocabanaboy, CCNP-Voice, CCDP, MCSE, CNX, A+, N+, I-net+, BOFH...
>
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