show ipv6 multicast group

Displays information about multicast listening discovery (MLD) groups.
Syntax
show ipv6 multicast group [group-address [detail] [tracking]]
Parameters
group-address
Specifies information for a particular group.
detail
Specifies the source list of a specific VLAN.
tracking
Specifies tracking information on interfaces that have tracking enabled.
Modes

Privileged EXEC mode

The show ipv6 multicast group command displays the following information:

Output Field

Description

group

The address of the IPv6 group (destination IPv6 address).

p-port

The physical port on which the group membership was received.

ST

Yes indicates that the MLD group was configured as a static group; No means it was learned from reports.

QR

Yes means the port is a querier port; No means it is not. A port becomes a non-querier port when it receives a query from a source with a lower source IP address than the port.

life

The number of seconds the group can remain in EXCLUDE mode. An EXCLUDE mode changes to INCLUDE if it does not receive an IS_EX or TO_EX message during a specified period of time. The default is 140 seconds. There is no life displayed in INCLUDE mode.

mode

The current mode of the interface: INCLUDE or EXCLUDE. If the interface is in INCLUDE mode, it admits traffic only from the source list. If the interface is in EXCLUDE mode, it denies traffic from the source list and accepts the rest.

source

Identifies the source list that will be included or excluded on the interface.

An MLDv1 group is in EXCLUDE mode with a source of 0. The group excludes traffic from 0 (zero) source list, which actually means that all traffic sources are included.

group

If you requested a detailed report, the following information is displayed:

  • The multicast group address
  • The mode of the group
  • Sources from which traffic will be admitted (INCLUDE) or denied (EXCLUDE) on the interface.
  • The life of each source list.

If you requested a tracking/fast leave report, the clients from which reports were received are identified.

Examples

This example shows that an MLDv1 group is in EXCLUDE mode with a source of 0. The group excludes only traffic from the 0 (zero) source list, which means that all traffic sources are included. 

Device#show ipv6 multicast group
p-:physical, ST:static, QR:querier, EX:exclude, IN:include, Y:yes, N:no
VL1 : 263 grp, 263 grp-port, tracking_enabled
      group                                    p-port ST QR life mode source
1     ff0e::ef00:a0e3                          1/7    N  Y  120  EX   0
2     ff01::1:f123:f567                        1/9    N  Y       IN   1

This example displays detailed MLD group information for multicast group ff0e::ef00:a096: 

Device#show ipv6 multicast group ff0e::ef00:a096 detail
Display group ff0e::ef00:a096 in all interfaces in details.
p-:physical, ST:static, QR:querier, EX:exclude, IN:include, Y:yes, N:no
VL1 : 1 grp, 1 grp-port, tracking_enabled
      group                                    p-port ST QR life mode source
1     ff0e::ef00:a096                          1/7    N  Y  100  EX   0
    group: ff0e::ef00:a096, EX, permit 0 (source, life):
      life=100, deny 0:

This example displays the list of clients that belong to multicast group ff0e::ef00:a096 when tracking and fast leave are enabled: 

Device#show ipv6 multicast group ff0e::ef00:a096 tracking
Display group ff0e::ef00:a096 in all interfaces with tracking enabled.
p-:physical, ST:static, QR:querier, EX:exclude, IN:include, Y:yes, N:no
VL1 : 1 grp, 1 grp-port, tracking_enabled
      group                                    p-port ST QR life mode source
1     ff0e::ef00:a096                          1/7    N  Y  80   EX   0
    receive reports from 1 clients: (age)
      (2001:DB8::1011:1213:1415 60)
Parent topic: Show Commands