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    Verifying a Multicast Configuration

    To verify a multicast configuration, perform these tasks:

    Verifying SAP and SDP Addresses and Ports

    Purpose

    Verify that SAP and SDP are configured to listen on the correct group addresses and ports.

    Action

    From the CLI, enter the show sap listen command.

    Sample Output

    user@host> show sap listen
    Group Address   Port
    224.2.127.254   9875
    

    Meaning

    The output shows a list of the group addresses and ports that SAP and SDP listen on. Verify the following information:

    • Each group address configured, especially the default 224.2.127.254, is listed.
    • Each port configured, especially the default 9875, is listed.

    Verifying the IGMP Version

    Purpose

    Verify that IGMP version 2 is configured on all applicable interfaces.

    Action

    From the CLI, enter the show igmp interface command.

    Sample Output

    user@host> show igmp interface
    Interface: ge–0/0/0.0
        Querier: 192.168.4.36
        State:         Up Timeout:     197 Version:  2 Groups:      0
    
    Configured Parameters:
    IGMP Query Interval: 125.0
    IGMP Query Response Interval: 10.0
    IGMP Last Member Query Interval: 1.0
    IGMP Robustness Count: 2
    
    Derived Parameters:
    IGMP Membership Timeout: 260.0
    IGMP Other Querier Present Timeout: 255.0
    

    Meaning

    The output shows a list of the interfaces that are configured for IGMP. Verify the following information:

    • Each interface on which IGMP is enabled is listed.
    • Next to Version, the number 2 appears.

    Verifying the PIM Mode and Interface Configuration

    Purpose

    Verify that PIM sparse mode is configured on all applicable interfaces.

    Action

    From the CLI, enter the show pim interfaces command.

    Sample Output

    user@host> show pim interfaces
    Instance: PIM.master
    Name                   Stat Mode       IP V State Count DR address
    lo0.0                  Up   Sparse      4 2 DR        0 127.0.0.1
    pime.32769             Up   Sparse      4 2 P2P       0
    

    Meaning

    The output shows a list of the interfaces that are configured for PIM. Verify the following information:

    • Each interface on which PIM is enabled is listed.
    • The network management interface, either ge–0/0/0 or fe–0/0/0, is not listed.
    • Under Mode, the word Sparse appears.

    Verifying the PIM RP Configuration

    Purpose

    Verify that the PIM RP is statically configured with the correct IP address.

    Action

    From the CLI, enter the show pim rps command.

    Sample Output

    user@host> show pim rps
    Instance: PIM.master
    Address family INET
    RP address      Type      Holdtime Timeout Active groups Group prefixes
    192.168.14.27   static           0    None             2 224.0.0.0/4
    

    Meaning

    The output shows a list of the RP addresses that are configured for PIM. At least one RP must be configured. Verify the following information:

    • The configured RP is listed with the proper IP address.
    • Under Type, the word static appears.

    Verifying the RPF Routing Table Configuration

    Purpose

    Verify that the PIM RPF routing table is configured correctly.

    Action

    From the CLI, enter the show multicast rpf command.

    Sample Output

    user@host> show multicast rpf
    Multicast RPF table: inet.0 , 2 entries...
    

    Meaning

    The output shows the multicast RPF table that is configured for PIM. If no multicast RPF routing table is configured, RPF checks use inet.0. Verify the following information:

    • The configured multicast RPF routing table is inet.0.
    • The inet.0 table contains entries.
     

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    Modified: 2017-09-13