Which criterion does the BGP maximum paths feature use for load balancing?

3 thoughts on “Which criterion does the BGP maximum paths feature use for load balancing?”

1. C.
   In order to be candidates for multipath, paths to the same destination need to have these characteristics equal to the best-path characteristics:

   Weight
   Local preference
   AS-PATH length
   Origin
   MED
   One of these:
   Neighboring AS or sub-AS (before the addition of the eiBGP Multipath feature)
   AS-PATH (after the addition of the eiBGP Multipathfeature)

   if any of those wins in a top-down manner, the rest is not considered.

   The question is slightly imprecise. I would take the most important criteria, C

   Reply

   1. Anon,
      your statement is wrong:
      “if any of those wins in a top-down manner, the rest is not considered. ”
      Not any of those, but ALL of those need to be equal otherwise the multipath feature won’t work.

      From the https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html

      These are the BGP Multipath features:
      eBGP Multipath – maximum-paths n
      iBGP Multipath – maximum-paths ibgp n
      eiBGP Multipath – maximum-paths eibgp n

      In order to be candidates for multipath, paths to the same destination need to have these characteristics equal to the best-path characteristics:

      Weight
      Local preference
      AS-PATH length
      Origin
      MED
      One of these:
      Neighboring AS or sub-AS (before the addition of the eiBGP Multipath feature)
      AS-PATH (after the addition of the eiBGP Multipath feature)

      I would say the question itself is wrong and there is no single correct answer. In this case ABC answers are correct.

      Reply

2. ABC?

   https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html

   Reply