8600 CP-Limit - 4500 Port Rate Limit

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  • marti571
    Member
    • Aug 2013
    • 4

    8600 CP-Limit - 4500 Port Rate Limit

    Hello
    I have 6 stacks of Avaya 4548 this stacks are connected to a stack distribution in 4548 which it connected whith SMLT on 2 network core Nortell networks 8600

    Since today on 8600 the SMLT ports connected to this distribution stack shutdown regularly with this kind of log:

    2014-02-04T08: 43:32.198098 +01:00 CPU5 [2014-02-04 8:59:04] WARNING CPU Shutdown Port 4/5 due to excessive control frames multicast 0, broadcast 15011 packet per second

    My question is
    What is the default value for the CP-LIMIT on 8600 ( 10000 pps ?)

    My other question is:
    How does the option of rate limit on ports Nortell 4548 works ?
    when the level is reached? the port become shutdown ? or til drop packets?
  • knemallapudi
    Member
    .
    • Sep 2013
    • 4

    #2
    CP limit

    Refer to the document "Administration - Avaya Ethernet Routing Switch 8800/8600"


    It has information on CP limit along with recommended value starting from page 64.

    Default values -
    broadcast-limit : Configures the broadcast control frame rate expressed as pps in a range from 1000– 100000. The default value is 10000

    multicast-limit : Configures the multicast control frame rate expressed as pps in a range from 1000–100000. The default is 15000.

    If you are using the 8692 SF/CPU with a SuperMezz, change the default to 3000
    pps

    Hope this helps.

    Comment

    • onikolaisen
      Member
      • Oct 2012
      • 8

      #3
      Just happened to read your post now, so I presume you have already resolved the loop issues you most likely had. However, if you're still not certain that it's resolved, or if you are worried that you might get the issues back, you should read up on SLPP and SLPP-guard.

      The ERS4500-platform has had slpp-guard since 5.6.0. If you haven't upgraded, do it!
      Quick steps:
      Globally enable SLPP on 8600s
      Set SLPP on all relevant vlans in the 8600 core

      On the 4500-series
      Globally enable slpp
      Enable slpp on all vlans
      Set slpp-guard on all upstream ports - NOT on the ports pointing towards the core
      And you isolate just the ports that have something looping them

      You will find the details in the The Small Campus Technical Solution Guide. Although this has the 5000-series as the core, the edge configuration is still the same. The other Campus-documents I just found were too old to have slpp-guard as a configuration option.

      Brgds
      Øyvind Nikolaisen
      Last edited by onikolaisen; 03-14-2014, 06:57 AM.

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