BGP4+ multipath

The BGP4+ multipath feature can be used to enable load-balancing across different paths.

BGP4+ selects only one best path for each IPv6 prefix it receives before installing it in the IP routing table. If you need load-balancing across different paths, you must enable BGP4+ multipath using the maximum-paths command under IPv6 address family configuration mode.

IBGP paths and EBGP paths can be exclusively selected, or a combination of IBGP and EBGP paths can be selected.

The following attributes of parallel paths must match for them to be considered for multipathing:

  • Weight
  • Local Preference
  • Origin
  • AS-Path Length
  • MED
  • Neighbor AS (EBGP multipath)
  • AS-PATH match (for IBGP multipath)
  • IGP metric to BGP next hop

In this section:

  1. Enabling Load-Balancing Across Different Paths
    The BGP4+ multipath feature can be configured, enabling load-balancing across different paths.
Parent topic: BGP4+