# Monitoring MLD Groups

#### Purpose

Display information about statically joined and directly connected groups learned through MLD.

#### Action

To display statically joined and directly connected groups learned through MLD without OIF mapping:

    host1:boston# show ipv6 mld groups
        Grp Address           Interface         State      Reporter     ExpTim oldHTo
    ------------------- ---------------------- -------- --------------- ------ ------
    ff0e::1             ATM2/0.15              Version2 fe80::90:1a02:1 54     0
                                                        640:91d
    ff0e::4:1           ATM2/0.15              Version2 fe80::90:1a02:1 54     0
                                                        640:91d
      Included Sources:
        51::1                                                           54
        51::2                                                           54
    Counts: 2 version-2, 0 version-1, 0 check state, 0 disabled
           (2 total)
            0 excluded
            Source-groups: 2 included, 0 excluded

To display statically joined and directly connected groups learned through MLD with OIF mapping:

    host1:boston# show ipv6 mld groups
        Grp Address           Interface         State      Reporter     ExpTim oldHTo
    ------------------- ---------------------- -------- --------------- ------ ------
    ff3e::1             ATM5/0.12              Version2 fe80::f7:0:91a: 377    0
                                                        0
                        oif-map OIFMAP ATM5/0.
                        121
    ff3e::1             ATM5/0.13              Version2 fe80::f7:0:a1a: 369    0
                                                        0
                        oif-map OIFMAP ATM5/0.
                        121
    ff3e::2             ATM5/0.12              Version2 fe80::f7:0:91a: 370    0
                                                        0
      Included Sources:
        10::2           oif-map OIFMAP self                             370
        10::10          oif-map OIFMAP ATM5/0.                          370
                        120
        10::11          oif-map OIFMAP ATM5/0.                          370
                        121
    ff3e::2             ATM5/0.13              Version2 fe80::f7:0:a1a: 373    0
                                                        0
      Included Sources:
        10::2           oif-map OIFMAP self                             373
        10::10          oif-map OIFMAP ATM5/0.                          373
                        120
        10::11          oif-map OIFMAP ATM5/0.                          373
                        121

    Counts: 4 version-2, 0 version-1, 0 check state, 0 disabled
           (4 total)
            0 excluded
            Source-groups: 6 included, 0 excluded

#### Meaning

Table 26 lists the show ipv6 mld groups command output fields.

Table 26: show ipv6 mld groups Output Fields

Field Name | Field Description
--- | ---
Grp Address | Address of the multicast group
Interface | Interface that discovered the multicast group
oif-map | Name of the OIF map and the mapped OIF interface, if a group or source has been mapped to an OIF
State | MLD version of the group
Reporter | Link-local address of the host reporting the multicast group
ExpTim | Remaining time, in seconds, at which the router stops polling for more members of this group
oldHTo | Remaining time at which the router stops polling for more MLDv1 members of a group. If this value is 0, the interface has received no MLDv1 reports for the group.
Included Sources | Sources included in the multicast group
Excluded Sources | Sources excluded from the multicast group
Counts | Number of source-group mappings by version and state

#### Related Documentation

- Enabling MLD on an Interface
- Configuring Multicast Groups for MLD
- Specifying MLD Multicast Groups
- Assigning an MLD Multicast Group to an Interface
- Configuring MLD Group Outgoing Interface Mapping
- show ipv6 mld groups