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    Monitoring Multicast Forwarding Entries

    Purpose

    Display information about all or specified 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 multicast forwarding entries.

    Action

    To display all multicast forwarding entries while bandwidth rate is constant:

    host1#show ip mroute
    IP Multicast Routing Table
    (S, G) uptime d h:m:s
      [Data rate: Kbps]  [SPT Threshold: Kbps]  [Threshold: Kbps]
      [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
    (10.0.10.1, 225.1.1.1) uptime 0 00:10:31
      Data rate: 2132 Kbps, Threshold 500 Kbps
      Admission bandwidth: 2000000 bps
      RPF route: 10.0.10.0/24, incoming interface atm5/3.1010
                 neighbor 10.0.10.8, owner Local
      Incoming interface list:
          atm5/3.1010 (10.0.10.8/24), Accept/Pim (RPF IIF)
      Outgoing interface list:
          atm5/1.108 (108.0.8.5/8), Forward/Pim, 0 00:02:52/never
          atm5/1.109 (107.0.8.4/8), Forward/Pim, 0 00:10:07/never
    (1.1.1.1, 225.1.1.1) uptime 0 00:00:34, never expires
    RPF route: 1.0.0.0/8, incoming interface ATM5/1.200
                 neighbor 2.2.2.2, owner Netmgmt
      Incoming interface list:
          ATM5/1.200 (2.1.1.1/8), Accept/Igmp (RPF IIF)
      Outgoing interface list:
          ATM5/1.300 (3.1.1.1/8), Forward/Igmp, 0 00:00:34/never
    Counts:     2 (S, G) entries
                0 (*, G) entries

    To display all multicasting entries while adaptive bandwidths enabled:

    Host1#show ip mroute
                      IP Multicast Routing Table
    (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
     (10.0.1.9, 225.1.1.1) uptime 0 00:00:23
      Admission bandwidth: 1998000 bps (adaptive)
      QoS bandwidth: 1998000 bps (adaptive)
      RPF route: 10.0.0.0/8, incoming interface ATM2/1.200
                 neighbor 21.1.1.1, owner Netmgmt
      Incoming interface list:
          ATM2/1.200 (21.2.2.2/8), Accept/Pim (RPF IIF)
      Outgoing interface list:
          ATM2/1.300 (31.2.2.2/8), Blocked (port-adm-limit)/Pim, 0 00:00:23/never
    Counts: 1 (S, G) entries
            0 (*, G) entries

    To display all multicast forwarding entries when the bandwidth limit of all the join interfaces exceeds the configured connection admission control limits (CAC):

    host1#show ip mroute
                      IP Multicast Routing Table
    (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
     (10.0.1.9, 225.1.1.1) uptime 0 00:00:23
      Admission bandwidth: 1998724 bps (adaptive)
      QoS bandwidth: 1998724 bps (adaptive)
      RPF route: 10.0.0.0/8, incoming interface ATM2/1.200
                 neighbor 21.1.1.1, owner Netmgmt
      Incoming interface list:
          ATM2/1.200 (21.2.2.2/8), Accept/Pim (RPF IIF)
      Outgoing interface list:
          ATM2/1.300 (31.2.2.2/8), Blocked (join-intf-adm-limit)/IGMP, 0 00:00:23/never
    Counts: 1 (S, G) entries
            0 (*, G) entries

    Meaning

    Table 1 lists the output fields of the show ip mroute command.

    Table 1: show ip mroute 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 that the (S,G) pair can be active, in days hours:minutes:seconds format or never

    Data Rate

    Flow rate for the threshold entry, in Kbps

    SPT Threshold

    SPT threshold value for the entry, in Kbps

    Threshold

    Threshold value for the entry, in Kbps

    Admission bandwidth

    Admission bandwidth per mroute, in bps

    QoS bandwidth

    QoS bandwidth per mroute, 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

    State/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

    Published: 2014-08-20