Giuseppe Larosa Thu, 01/15/2009 - 02:23
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Hello Paolo,


1) load balancing is actually done by CEF on the forwarding level.

IGP have usually maximum-paths 4 so they can load balance up to 4 equal costs path by default.


BGP can load balance but by default it has maximum-paths 1

two options are possible:

using a loopback to perform load balacing by recursion (the BGP session is only one but BGP next-hop is reachable through two or more links)


or

inside router bgp you increase maximum-paths with an explicit command


It depends from your scenario


2)

if BGP is enabled in all routers you can choice to send a default route in BGP but if it isn't you need to propagate a default route in your IGP


Hope to help

Giuseppe


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