maximum load-balancing eibgp (BGP multi-instance VPN instance IPv4 address family view)

The maximum load-balancing eibgp command is used in a VPN where a CE is dual-homed to PEs. When the CE shares one AS with only one of the CEs, you can set the number of EBGP and IBGP routes for load balancing. This allows VPN traffic to be balanced among EBGP and IBGP routes.

NOTE:

If you run the maximum load-balancing eibgp command, the device changes the next hop addresses of the routes to be advertised to a local address no matter whether the routes are used for load balancing. However, in RR or BGP confederation scenarios, the device does not change the next hop addresses of non-local routes to be advertised to a local address.

If you run the maximum load-balancing eibgp ecmp-nexthop-changed command, the device does not change the next hop addresses of the routes to be advertised to a local address no matter whether the routes are used for load balancing.

In Add-Path scenarios, the next hops of Add-Path routes to be advertised are processed in the same way as that of the optimal route no matter whether the routes are used for load balancing, regardless of whether load balancing is implemented.

After BGP load balancing is configured, BGP routes that meet the following conditions and have the same AS_Path attribute are equal-cost routes and implement load balancing:

• PrefVal values are the same.
• Local_Pref attributes are the same.
• All BGP routes are summarized or non-summarized routes.
• AS_path lengths are the same.
• Origin types (IGP, EGP, or Incomplete) are the same.
• Multi_Exit Discriminator (MED) values are the same.
• AS_Path attributes are the same.
  Configuring BGP load balancing better utilizes network resources.
  For BGP routes with the same prefix in a routing table:
• If the optimal route and the routes selected for load balancing are all labeled routes, the number of routes used for load balancing depends on the maximum load-balancing ingress-lsp or maximum load-balancing transit-lsp command configuration.
• If the optimal route and the routes selected for load balancing are all non-labeled routes, the number of routes used for load balancing depends on the maximum load-balancing eibgp command configuration.
  If BGP labeled routes implement load balancing and the ingress LSP creation criteria are met, ingress LSPs are created for the labeled routes. If BGP labeled routes implement load balancing and the transit LSP creation criteria are met, transit LSPs are created for the labeled routes.