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

Table 7: 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

Monitoring Active Multicast Routes

Purpose

Action

Meaning

Related Documentation