Comments

  • JoeMJoeM ✭✭✭

    It is automatically enabled.   It is possible to see it with these commands:

              debug ip msdp routes

             show ip msdp sa-cache

     

    I found this note in the CiscoDoc:

    In all current and supported Cisco IOS software releases,
    caching of MSDP SA messages is mandatory and cannot be manually enabled
    or disabled. By default, when an MSDP peer is configured, the ip multicast cache-sa-state
    command will automatically be added to the running configuration. Prior
    to Cisco IOS Releases 12.1(7) and 12.0(14)S1, caching of SAs was
    disabled by default and could be enabled with the ip msdp cache-sa-state command.

  • Thank you very much.  I was digging on Cisco.com but I didn't find that nuggut :)

  • JoeMJoeM ✭✭✭

    I modified my current lab for MSDP.     The two commands I gave above show the direction of the cache.

    It is interesting to change the RP's to be responsible for specific groups.  The cache will change directions.  Here is a sample.

    R1:

    RP 150.1.4.4, BGP/AS 0, 00:09:15/now, Peer 150.1.4.4
    RP 150.1.4.4, BGP/AS 0, 00:09:15/now, Peer 150.1.4.4


    MSDP(0): (142.1.13.1/32, 236.36.36.36), accepted




    Rack1R1(config)#do sh ip msdp sa
    MSDP Source-Active Cache - 11 entries
    (142.1.34.4, 231.31.31.31), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:03:29, Peer 150.1.4.4
    (142.1.46.4, 231.31.31.31), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:03:29, Peer 150.1.4.4
    (150.1.4.4, 231.31.31.31), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:03:29, Peer 150.1.4.4
    (142.1.13.1, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:05:01, Peer 150.1.4.4
    (142.1.13.3, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/now, Peer 150.1.4.4
    (142.1.34.3, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/now, Peer 150.1.4.4
    (142.1.34.4, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:03:29, Peer 150.1.4.4
    (142.1.46.4, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:01:29, Peer 150.1.4.4
    (150.1.1.1, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:05:01, Peer 150.1.4.4
    (150.1.4.4, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/00:03:29, Peer 150.1.4.4
    (204.12.1.3, 236.36.36.36), RP 150.1.4.4, BGP/AS 0, 00:06:29/now, Peer 150.1.4.4

    Then change the RP, and the cache will be sent from that RP.

    ==================

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