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 67 lists the show ipv6 mld groups command output fields.

Table 67: 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