[c-nsp] ebgp load balancing using maxiumu-paths TCAM impact on Sup720-3BXL?

Peter Kranz pkranz at unwiredltd.com
Wed May 20 22:40:20 EDT 2009

Setup is as follows; 2 edge routers, each with a BGP session receiving full
routes to the same provider router. The provider is load balancing inbound
traffic to our AS nicely, 50/50 between the edge routers.. I would also like
to load balance the outbound traffic.. I've considered adding 'maximum-paths
2' to install the two equal paths, but an concerned about FIB TCAM impacts.
Will adding this command cause each equal cost route to take one additional
TCAM entry, i.e. full routing table x 2 > 524k TCAM limit = EPIC meltdown?


Current FIB TCAM:

L3 Forwarding Resources

             FIB TCAM usage:                     Total        Used

                  72 bits (IPv4, MPLS, EoM)     524288      285506

                 144 bits (IP mcast, IPv6)      262144           5


Peter Kranz
 <http://www.UnwiredLtd.com> www.UnwiredLtd.com
Desk: 510-868-1614 x100

Mobile: 510-207-0000
 <mailto:pkranz at unwiredltd.com> pkranz at unwiredltd.com


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