[j-nsp] Re: M5 - outbound load balancing

Pedro Roque Marques roque at juniper.net
Wed Jan 19 17:13:59 EST 2005


Stefan A Fouant writes:

> Hi, The "show route extensive" output shows that the second path is
> inactive because of the Router-ID which indicates that multipath is
> not working correctly - proper operation of multipath skips the
> Router-ID and Peer-ID evaluation during the BGP Path Selection
> algorithm.  I don't think multipath is working in your case because
> you've configured these two peers under different groups.

Close, but not quite.

multipath will not group together paths received from different
ASes. The reason being that BGP can only advertise one path.

If you setup BGP to accept path from different ASes, then as-path loop
detection is being defeated if this route is subsequently advertised
via BGP, as the forwarding path no longer corresponds to the routing
path.

  Pedro.


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