# Monitoring IPv6 Multicast Forwarding Entries

#### Purpose

Displays information about all or specified multicast forwarding entries. You can specify a multicast group IPv6 address or both a multicast group IPv6 address and a multicast source IPv6 address to display information about particular multicast forwarding entries.

#### Action

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

    host1#show ipv6 mroute
    IPv6 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

    (10:0:0:1:1::, ff0e::1) uptime 0 01:04:12
      RPF route: 10:0:0:1::/64, incoming interface ATM2/3.1001
                 neighbor 10:0:0:1::1, owner Local
      Incoming interface list:
          ATM2/3.1001 (10:0:0:1::1/64), Accept/Pim (RPF IIF)
      Outgoing interface list:
          ATM2/0.200 (21:2:2:21::2:1/60), Forward/Pim, 0 01:04:12/never

    (10:0:0:1:2::, ff0e::1) uptime 0 01:04:12
      RPF route: 10:0:0:1::/64, incoming interface ATM2/3.1001
                 neighbor 10:0:0:1::1, owner Local
      Incoming interface list:
          ATM2/3.1001 (10:0:0:1::1/64), Accept/Pim (RPF IIF)
      Outgoing interface list:
          ATM2/0.200 (21:2:2:21::2:1/60), Forward/Pim, 0 01:04:12/never

    Counts: 2 (S, G) entries
            0 (*, G) entries

To display all multicast forwarding entries when bandwidth limit of all the join interfaces exceeds configured CAC limits:

    host1#show ipv6 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

    (10:0:0:1:1::, ff0e::1) uptime 0 01:04:12
      RPF route: 10:0:0:1::/64, incoming interface ATM2/3.1001
                 neighbor 10:0:0:1::1, owner Local
      Incoming interface list:
          ATM2/3.1001 (10:0:0:1::1/64), Accept/Pim (RPF IIF)
      Outgoing interface list:
          ATM2/0.200 (21:2:2:21::2:1/60), Forward/Pim, 0 01:04:12/never

    (10:0:0:1:2::, ff0e::1) uptime 0 01:04:12
      RPF route: 10:0:0:1::/64, incoming interface ATM2/3.1001
                 neighbor 10:0:0:1::1, owner Local
      Incoming interface list:
          ATM2/3.1001 (10:0:0:1::1/64), Accept/Pim (RPF IIF)
      Outgoing interface list:
          ATM2/0.200 (21:2:2:21::2:1/60), Blocked (join-intf-adm-limit)/IGMP, 0 01:04:12/never

    Counts: 2 (S, G) entries
            0 (*, G) entries

#### Meaning

Table 15 lists the show ipv6 mroute command output fields.

Table 15: show ipv6 mroute Output Fields

Field Name | Field Description
--- | ---
(S,G) | IPv6 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 | IPv6 address and prefix of the RPF route
Incoming interface | Type and specifier of the incoming interface for the RPF route
neighbor address | IPv6 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
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 Time that the interface has been active in this multicast forwarding entry, in days hours:minutes:seconds format Time that the interface will cease to be active in this multicast forwarding entry, in days hours:minutes:seconds format
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-limit) Protocol running on the interface: PIM or MLD Time that the interface has been active in this multicast forwarding entry, in days hours:minutes:seconds format Time that the interface will cease to be active in this multicast forwarding entry, in days hours:minutes:seconds format
Counts | Numbers of types of source group mappings: (S,G)—Number of (S,G) entries (*,G)—Number of (*,G) entries

#### Related Documentation

- Defining IPv6 Static Routes for Reverse-Path Forwarding
- Example: Configuring an IPv6 Multicast Bandwidth Map
- Activating IPv6 Multicast QoS Adjustment Functions
- Blocking IPv6 Mroutes
- Enabling Interface-Level Admission Bandwidth Limitation for IPv6
- Creating IPv6 Mroute Port Limits
- Enabling Port-Level Admission Bandwidth Limitation for IPv6
- show ipv6 mroute