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Monitoring MLD

You can establish a reference point for MLD statistics by setting the statistics counters to zero.

To display MLD parameters, use the show commands described in this section.

Note: The E120 router and E320 router output for monitor and show commands is identical to output from other E-series routers, except that the E120 and E320 router output also includes information about the adapter identifier in the interface specifier (slot/adapter/port).

baseline ipv6 mld

Use to set the counters for MLD statistics to zero.
Example (host1)#baseline ipv6 mld
There is no no version.
See baseline ipv6 mld.

show ipv6 mld

Use to display MLD information for a VR.
Field descriptions
- Administrative state—Status of MLD in the software: enabled or disabled
- Operational state—Status of MLD on the VR: enabled or disabled
- total interfaces—Number of interfaces on which you started MLD
- enabled—Number of interfaces on which MLD is enabled
- disabled—Number of interfaces on which MLD is disabled
- learned groups—Number of multicast groups that the VR has discovered
- MLD Statistics Rcvd—Statistics for MLD messages received
  - total—Number of MLD messages received
  - checksum errors—Number of MLD messages received with checksum errors
  - unknown types—Number of messages received that are not multicast listener queries, multicast listener reports, or multicast listener done messages
  - discards—Number of multicast listener discards
  - queries—Number of multicast listener queries
  - reports—Number of multicast listener reports
  - leaves—Number of done messages
- MLD Statistics Sent—Number of multicast listener queries sent

Example

host1:boston#show ipv6 mld
Routing Process MLD, Administrative state enabled, Operational state enabled
    4 total interfaces, 4 enabled, 0 disabled
    2 learned groups
MLD Statistics:
    Rcvd: 3 total, 0 checksum errors, 0 unknown types, 0 discards
          0 queries, 3 reports, 0 leaves
    Sent: 5 total

See show ipv6 mld.

show ipv6 mld groups

Use to display statically joined and directly connected groups learned through MLD.
Field descriptions
- 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

Example 1—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

Example 2—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

See show ipv6 mld groups.

show ipv6 mld interface

Use to display MLD information for interfaces on which you enabled MLD.
Specify the brief keyword to see a summary of the information.
Specify the count keyword to see the number of MLD interfaces.
Field descriptions
- Interface—Type of interface and interface specifier. For details about interface types and specifiers, see Interface Types and Specifiers.
- address—IPv6 link-local address of the interface
- Administrative state—Status of the interface in the software: enabled or disabled
- Operational state—Physical status of the interface: enabled or disabled
- Version—MLD version
- State—Function of the interface: querier or nonquerier
- Query Interval—Time interval at which this interface sends query messages
- Other querier present interval—Time that the interface waits before declaring itself as the querier
- Maximum response time—Time interval during which this interface expects a host to respond
- Last member query interval—Time that this interface waits before sending a new query to a host that sends a group leave message
- Robustness—Number of times this interface sends MLD messages
- Information about IPv6 access lists configured with the ipv6 mld access-group command
  - Inbound access group—Access list specified
  - No inbound access group—No access list specified
- Information about IPv6 access lists configured with the ipv6 mld access-source-group command
  - Inbound access source-group—Access list specified
  - No inbound access source-group—No access list specified
- Information about OIF maps configured with the ipv6 mld apply-oif-map command
  - Inbound apply-oif-map—Map name specified
  - No inbound apply-oif-map—No map name specified
- Immediate Leave—Setting of the ipv6 mld immediate-leave command: enabled or disabled
- Explicit Host Tracking—Setting of the ipv6 mld explicit-tracking command: enabled or disabled
- Max-Group limit—Number of MLD groups that the interface can accept, as configured with the ipv6 mld group limit command
- Group Count—Number of MLD groups that the interface has accepted
- IOA packet replication—Hardware multicast packet replication interface to which egress multicast packets on this interface are redirected
- Interface statistics Rcvd—Information about MLD messages received on this interface
  - reports—Number of group multicast listener reports received
  - leaves—Number of group multicast listener done messages received
  - wrong version queries—Number of multicast listener queries received from devices running a different version of MLD
- Interface statistics Sent—Number of MLD messages this interface has sent
- Interface statistics Groups learned—Number of groups this interface has discovered
- Counts—Total number of MLD interfaces

Example

host1:boston#show ipv6 mld interface

Interface ATM5/0.1 address fe80::f7:0:321a:0
Administrative state enabled, Operational state enabled
Interface parameters:
    Version 1
    State Querier
    Query Interval 125 secs, 123 secs before the next query
    Other querier present interval 250 secs
    Maximum response time 100 (in 10ths of a second)
    Last member query interval 10 (in 10ths of a second)
    Robustness 3
    No inbound access group
    No inbound access source-group
    No inbound apply-oif-map
    Immediate Leave: disabled
Explicit Host Tracking: enabled
Max-Group limit: No Limit
    Group Count: 0
Interface statistics:
    Rcvd: 0 reports, 0 leaves, 0 wrong version queries
    Sent: 14 queries
    Groups learned: 0

Counts: 0 down, 0 init state, 1 querier, 0 non-querier, 1 Total

Example 2

host1#show ipv6 mld interface gigabitEthernet 3/0.0
Interface GigabitEthernet3/0.0 address 10.1.1.1/255.255.255.0
Administrative state enabled, Operational state enabled
Interface parameters:
    Version 1
    State Querier
    Query Interval 125 secs, 123 secs before the next query
    Other querier present interval 250 secs
    Maximum response time 100 (in 10ths of a second)
    Last member query interval 10 (in 10ths of a second)
    Robustness 3
    No inbound access group
    No inbound access source-group
    No inbound apply-oif-map
    Immediate Leave: disabled
Explicit Host Tracking: enabled
Max-Group limit: No Limit
    Group Count: 0
    IOA packet replication gigabitEthernet 3/8.1
Interface statistics:
    Rcvd: 0 reports, 0 leaves, 0 wrong version queries
    Sent: 14 queries
    Groups learned: 0

Counts: 0 down, 0 init state, 1 querier, 0 non-querier, 1 Total

See show ipv6 mld interface.

show ipv6 mld interface brief

Use to display a summary of MLD information for interfaces on which you enabled MLD.
Field descriptions
- Interface—Type of interface and interface specifier. For details about interface types and specifiers, see Interface Types and Specifiers.
- Intf Address—IPv6 link-local address of the interface
- Ver—MLD version
- State—Function of the interface: querier or nonquerier
- Querier—IPv6 address of the querier on the network to which this interface connects
- QTime—Remaining time interval at which this interface sends query messages
- QPTime—Remaining time that the interface waits before declaring itself as the querier

Example

host1:boston# show ipv6 mld interface brief 
   Interface     Intf Address   Ver    State        Querier     QTime  QPTime
--------------- --------------- --- ----------- --------------- ------ ------
ATM5/0.1        fe80::f7:0:231a 1   Querier     fe80::f7:0:231a 1      0
                :0                              :0
ATM5/0.200      fe80::f7:0:231a 2   Querier     fe80::f7:0:231a 20     0
                :0                              :0
Counts: 0 down, 0 init state, 2 querier, 0 non-querier, 2 Total

See show ipv6 mld interface.

show ipv6 mld mapped-oif

Use to display the current mappings to all mapped outgoing interfaces or to the specified mapped outgoing interface.
Field descriptions
- OIF—Outgoing interface used in an OIF map
- Oper—Operation status of the outgoing interface
- Group Address—Multicast group IP address associated with the OIF
- Source Address—Source IP address associated with the OIF
- Join I/F—MLD protocol interface associated with the OIF
- Map Name—Name of the map associated to the OIF
- Counts—Number of source-group mappings to OIFs

Example

host1# show ipv6 mld mapped-oif
      OIF       Oper  Group Address  Source Address     Join I/F      Map Name 
--------------- ---- --------------- --------------- --------------- ----------
ATM5/0.120      Up   ff3e::2         10::10          ATM5/0.12       OIFMAP    
                                                     ATM5/0.13       OIFMAP    
ATM5/0.121      Up   ff3e::1         *               ATM5/0.12       OIFMAP    
                                                     ATM5/0.13       OIFMAP    
                     ff3e::2         10::11          ATM5/0.12       OIFMAP    
                                                     ATM5/0.13       OIFMAP    
 
Counts: 3 source-group mappings

See show ipv6 mld mapped-oif.

show ipv6 mld oif-map

Use to display all outgoing interface (OIF) maps or the OIF map for the specified map name.
Field descriptions
- Map Name—Name of the map associated to the show output
- Group Prefix—Multicast group IPv6 prefix
- Source Prefix—Source IPv6 prefix
- OIF—Outgoing interface associated with the group and source prefix

Example

host1#show ipv6 mld oif-map
     Map Name         Group Prefix      Source Prefix           OIF        
------------------ ------------------ ------------------ ------------------
OIFMAP             ff3e::/112         ::/0               ATM5/0.121        
                   ff3e::/112         10::2/128          self              
                   ff3e::/112         10::10/128         ATM5/0.120        
                   ff3e::3/128        ::/0               ATM5/0.130        
                   ff3e::4/128        ::/0               ATM5/0.130

See show ipv6 mld oif-map.

show ipv6 mld membership

Use to display MLD membership information for multicast groups and (S, G) channels.
Specify the brief keyword to see a summary of the information.
Specify the tracked keyword to see interface information only for interfaces where explicit host tracking is enabled.
Field descriptions
- Group—Multicast group or (S, G) channel
- Source—(S, G) entries that are forwarding traffic
- Reporter—Hosts that requested including sources or that have not requested excluding sources. If listed under a group, host that sent exclude reports for the group. If listed under a source, host that requested traffic from this source for the group. For any (S, G), if listed under a source, indicates hosts interested in the traffic for this (S, G).
- ExpTim—Expiration time
- Flags
  - M—Uses Oifmap
  - S—SSM mapped
  - T—Tracked
  - 1, 2—MLD version that the group is in
- Interface—Type of interface and interface specifier. For details about interface types and specifiers, see Interface Types and Specifiers.

Example

host1:boston# show ipv6 mld membership
Flags: M – Uses Oifmap  S– SSM mapped  T – tracked 
       1,2 – The version of MLD the group is in
Reporter:
<ip-address> - last reporter if the group is not explicitly tracked
<n>/<m> - <n> reporters include mode, <m> reporters in exclude
Group      Source      Reporter                  ExpTim    Flags     Interface
---------  --------    ----------------------    ------    ------    ---------------
ff0e::40      *        fe80::90:1a02:1640:91d    02:41     2S        FastEthernet2/1
                                             
ff0e::50               1/2                       02:56    3MT       FastEthernet2/2 
                       fe80::90:1a02:1640:911    02:30
                       fe80::90:1a02:1640:912    02:48      
           20::11         
                       fe80::90:1a02:1640:913    02:56     
           20::12      
                       fe80::90:1a02:1640:911    02:30     
           20::13         
                       fe80::90:1a02:1640:911    02:30 
                       fe80::90:1a02:1640:912    02:48     
                       fe80::90:1a02:1640:913    02:56     
ff0e::60               fe80::90:1a02:1640:901    01:56     3        FastEthernet2/3
           10::10                                02:45
           10::11                                02:35 
           10::12                                02:15 
           10::14                                stop
ff0e::70               fe80::90:1a02:1640:91     stop      3        FastEthernet2/4
           40::10                                01:10
           40::11                                01.24
ff0e::80               2/0                       stop      3T       FastEthernet2/5 
           50::10       
                       fe80::90:1a02:1650:910    02:48     
           50::11        
                       fe80::90:1a02:1650:920    02:56     
                       fe80::90:1a02:1650:910    02:48     
           50::12      fe80::90:1a02:1650:920    02:56     
ff0e::90               0/3                       02:56     2T       FastEthernet2/6 
              *             
                       fe80::90:1a02:1660:910    02:48     
                       fe80::90:1a02:1660:920    02:56     
                       fe80::90:1a02:1660:930    02:48

See show ipv6 mld membership.

show ipv6 mld oif-mapping

Use to display the mapped OIF to be assigned to a given map-name, group address, and source address.
Field descriptions
- OIF-MAP Name—Name of the map requested
- Group Address—Multicast group IP address requested
- Source Address—Source IP address requested
- Mapped OIF—Join interface associated with the OIF map

Example

host1#show ipv6 mld oif-mapping OIFMAP ff3e::1 10::10 
    OIF Mapping
    OIF-MAP Name   : OIFMAP
    Group Address  : ff3e::1
    Source Address : 10::10
    Mapped OIF     : ATM5/0.120

See show ipv6 mld oif-mapping.

show ipv6 mld ssm-mapping

Use to display the SSM mapping state and the source list mapping associated with a multicast group address.
Field descriptions
- SSM Mapping—Status of SSM mapping on the interface (enabled or disabled)
- Group Address—Multicast group address requested
- Source List—List of sources mapped to the multicast group address

Example

host1:boston#show ipv6 mld ssm-mapping ff3e::1
    SSM Mapping   : Enabled
    Group Address : ff3e::1
    Source List   : 2001::1
                  : 2001::2

See show ipv6 mld ssm-mapping.

show multicast group limit

Use to display the number of MLD groups that ports have accepted and, if configured, the maximum number of groups that ports can accept.
A value of –1 indicates that no port group limit is configured.
Only ports that have accepted MLD groups and ports for which you have configured a limit for the number of MLD groups appear in this display.
Field descriptions
- Port—Identifier of the port in slot/port format
  - slot—Number of the chassis slot in the range 0–6 (ERX-7xx models) or 0–13 (ERX-14xx models)
  - port—Port number on the I/O module
- limit—Maximum number of MLD groups that the port can accept. A value of –1 indicates that no limit has been specified.
- count—Actual number of MLD groups the port has accepted

Example

host1:boston#show multicast group limit
Port      limit count
--------- ----- -----
2/0           5     0
2/1          -1     1

See show multicast group limit.

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