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    Monitoring Active Multicast Routes

    Purpose

    Display active multicast routes.

    • You can specify a multicast group IP address or both a multicast group IP address and a multicast source IP address to display information about particular active multicast forwarding entries.
    • You can specify the bandwidth threshold to display the active multicast routes with admission bandwidth greater than the specified bandwidth threshold. The default bandwidth threshold is 4000 bps.
    • You can use the summary option to see a summary rather than a detailed description.
    • You can use the count option to display the number of active multicast forwarding entries.
    • You can use the oif-detail option to display the details of the join interfaces corresponding to the mapped interface when oif-mapping is configured.
    • You can use the statistics option to display statistics for packets received through all active multicast forwarding entries that the router has added to the multicast routing table and established on the appropriate line modules.

    Action

    To display the active multicast routes with bandwidth above 10000 bps:

    host1#show ip mroute active 10000
                  Active IP Multicast Routes >=10000 bps
    (S, G) uptime d h:m:s[, expires d h:m:s]
      [Admission bandwidth: bps]
      [QoS bandwidth: bps]
      RPF route: addr/mask, incoming interface
                 neighbor address, owner route-owner
      Incoming interface list:
          Interface (addr/mask), State/Owner [(RPF IIF)]
      Outgoing interface list:
          Interface (addr/mask), State/Owner, Uptime/Expires
    (52.0.0.1, 232.0.0.1) uptime 0 00:01:07
      Admission bandwidth: 47000 bps (adaptive)
      QoS bandwidth: 47000 bps (adaptive)
      RPF route: 52.0.0.0/24, incoming interface ATM2/1.17
          neighbor 17.0.0.2, owner NetmgmtRpf
      Incoming interface list:
          ATM2/1.17 (17.0.0.2/24), Accept/Igmp (RPF IIF)
      Outgoing interface list:
          NULL
    Counts: 1 (S, G) entries
            0 (*, G) entries

    To display the summary of active multicast routes:

    host1#show ip mroute summary active
                  Active IP Multicast Routes >=4000 bps
    Group Address   Source Address  RPF route          RPF Iif         #Oifs
    --------------- --------------- ------------------ --------------- -----
    232.0.0.1       51.0.0.1        51.0.0.0/24        ATM3/1.17       0
    232.0.0.2       51.0.0.1        51.0.0.0/24        ATM3/1.17       0
    232.0.0.3       51.0.0.1        51.0.0.0/24        ATM3/1.17       0
    Counts: 3 (S, G) entries
            0 (*, G) entries

    Meaning

    Table 1 lists the show ip mroute active and show ip mroute summary active commands output fields.

    Table 1: show ip mroute active and show ip mroute summary active Output Fields

    Field Name

    Field Description

    (S,G)

    IP addresses of the multicast source and the multicast group

    Uptime

    Length of time that the (S,G) pair has been active, in days hours:minutes:seconds format

    Expires

    Length of time for which the (S,G) pair will be active, in days hours:minutes:seconds format

    Admission bandwidth

    Admission bandwidth (in bps)

    QoS bandwidth

    QoS bandwidth (in bps)

    RPF Route

    IP address and subnetwork mask of the RPF route

    Incoming interface

    Type and specifier of the incoming interface for the RPF route

    neighbor address

    IP address of the neighbor

    owner

    Owner of the route:

    • Local—route belonging to the local interface
    • Static—Static route
    • Other protocols—Route established by a protocol such as RIP or OSPF

    Incoming interface list

    List of incoming interfaces on the router. Details include:

    • Type of interface and its specifier
    • Action that the interface takes with packets: Accept or Discard
    • Multicast protocol that owns the interface

    Outgoing interface list

    List of outgoing interfaces on the router. Details include:

    • Type of interface and its specifier
    • Action that the interface takes with packets: Forward or Blocked (intf-adm-limit, join-intf-adm-limit, port-adm-limit, port-limit, port-priority-adm-limit)
    • Protocol running on the interface: PIM, DVMRP, or IGMP
    • Amount of time that the interface has been active in this multicast forwarding entry, in days hours:minutes:seconds format
    • Length of time that the interface can remain active in this multicast forwarding entry, in days hours:minutes:seconds format or never

    Counts

    Numbers of types of source group mappings:

    • (S,G)—Number of (S,G) entries
    • (*,G)—Number of (*,G) entries

    Group Address

    IP address of the multicast group

    Source Address

    IP address of the multicast source

    RPF Iif

    Type and identifier for the incoming interface for the RPF route

    #Oifs

    Number of outgoing interfaces

    Published: 2014-08-20