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 Kpbs
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

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