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 6 lists the output fields of the show ip mroute command.

Table 6: 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

Related Documentation