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Multiprotocol extensions to BGP

  • From: Mathew Richardson <mrr@nexthop.com>
  • Date: Fri, 21 Jun 2002 17:44:19 -0400
  • User-Agent: Mutt/1.2.5.1i
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> Rajesh Potti <rpotti@nortelnetworks.com> [Fri, Jun 21, 2002 at 04:21:14PM -0400]:
>
>Hi,
>
> What is the maximum  number of prefixes that can be included in the
>MP_UNREACH_NLRI attribute of an update?  And how many prefixes
> can be send in the MP_REACH_NLRI attribute of a BGP update message?
>
> I looked at  RFC 2858 (Multiprotocol Extensions to BGP-4), but could
>not see a limit specified.

<snip>

There is no explicit limit; however, the maximum size of a BGP Update
message is 4096 octets, so there _is_ a limite.  The exact number that
can be included will depend on the number of octets consumed by
other path attributes.

mrr