BGP Multipath in 11.2 and 11.3...
--- BGP Multipath SupportWhen a BGP speaker learns two identical EBGP paths for a prefix from a neighboring AS, it will choose the path with the lowest route-id as the best path. This best path is installed in the IP routing table. If BGP multipath support is enabled and the EBGP paths are learned from the same neighboring AS, instead of picking one best path, multiple paths are installed in the IP routing table.
During packet switching, depending on the switching mode, either per-packet or per-destination load balancing is performed among the multiple paths. A maximum of six paths is supported. The [maximum-paths] router configuration command controls the number of paths allowed. By default, BGP will install only one path to the IP routing table.
<http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr /np1_c/1cbgp.htm>
GK
At 07:42 PM 1/23/98 +0200, Dimitris Zisiadis wrote: > > > Sorry for the mess in the previous mail, >here is the correct map: > >> Hello all, >> >>sorry if the question seems trivial to this list, >>but i didn't find any specific information on >>the CCO for a load balancing scheme between >>two ASs with more than two routers involved (3/4). >> >> Here is the scenario: >> >> AS X AS Y >> >> _____________________ B >> / >> A >> \_____________________ C >> >> Router A belongs to AS X, while routers B and C belong to AS Y. >> >> Router A is to receive FULL routing from AS Y and have the two >>connections to AS Y load balanced and backed up. >> >> One solution of course is to manualy configure the announcements >>with prepends of AS X or to use two route mapped MED values for the >>two connections, but it is very hard to keep it functional. >>I was wondering if there is some other way around it. >> >> >> Regards >> >> Dimitris Zisiadis >> >> > > > >
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