EVPN link bandwidth extended community

You can load-balance traffic for Type 5 routes based on Layer 3 link bandwidth from multihomed devices using the EVPN link bandwidth extended community. Use this community to provide weighted equal-cost multipath (WECMP) for unequal load balancing. You enable the bandwidth advertisement with a routing policy.

To configure, use the set policy-options policy-statement <policy-name> then aggregate-bandwidth and set routing-instances <instance-name> protocols evpn ip-prefix-routes export <policy-name> commands. Associate bandwidth with OSPF or IS-IS using spf-options multipath weighted one-hop and with BGP using the multipath and link-bandwidth auto-sense configurations. If any provider edge (PE) device lacks bandwidth or a units mismatch occurs, forwarding reverts to ECMP. Monitor status with show evpn ip-prefix-database extensive.