(In)sane defaults

Because SUP720-3BXL and because all who have a full BGP feed with it should have seen this in the last days:
*%MLSCEF-SP-4-FIB_EXCEPTION_THRESHOLD: Hardware CEF entry usage is at
95% capacity for IPv4 unicast protocol*

Because 512k routes should be enough for everyone (although the specs advertise 1024k).

Here you will find a workaround:

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/117712-problemsolution-cat6500-00.html

Ofc, reload is needed 🙁

 

3 thoughts on “(In)sane defaults

    1. Dumitru Post author

      Since the today’s ipv6 full table is only about 17k routes this should give me a year or two to upgrade:

      SUP720-3BXL#sh mls cef maximum-routes
      FIB TCAM maximum routes :
      =======================
      Current :-
      ——-
      IPv4 + MPLS – 512k (default)
      IPv6 + IP Multicast – 256k (default)

      User configured :-
      —————
      IPv4 – 768k
      MPLS – 16k (default)
      IPv6 + IP Multicast – 120k (default)

      Upon reboot :-
      ———–
      IPv4 – 768k
      MPLS – 16k (default)
      IPv6 + IP Multicast – 120k (default)

      Reply
  1. Dumitru Post author

    It has begun.

    Aug 12 10:19:01: %MLSCEF-DFC4-4-FIB_EXCEPTION_THRESHOLD: Hardware CEF
    entry usage is at 95% capacity for IPv4 unicast protocol.
    Aug 12 10:49:56: %CFIB-SP-3-CFIB_EXCEPTION: FIB TCAM exception for IPv4
    unicast. Packets through some routes will be dropped.
    Use “mls cef maximum-routes” to modify the FIB TCAM partition or/and
    consider a hardware upgred.
    Examine your network and collect the necessary information from this setup.
    The only way to recover from this state is by reload the router.

    Reply

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