Monitoring IGMP

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

To display IGMP 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 ip igmp

• Use to set the counters for IGMP statistics to zero, to establish a baseline.
• Example

  (host1)#baseline ip igmp

• There is no no version.
• See baseline ip igmp.

show ip igmp

• Use to display IGMP information for a VR.
• Field descriptions
  • Routing Process—Routing process for this VR (IGMP)
  • Administrative state—Status of IGMP in the software: enabled or disabled
  • Operational state—Status of IGMP on the VR: enabled or disabled
  • Total interfaces—Number of interfaces on which you started IGMP
  • enabled—Number of interfaces on which IGMP is enabled
  • disabled—Number of interfaces on which IGMP is disabled
  • learnt groups—Number of multicast groups that the VR has discovered
  • IGMP graceful restart duration—Restart interval in seconds
  • IGMP Statistics Rcvd—Statistics for IGMP messages received
    • total—Total number of IGMP messages received
    • checksum errors—Number of IGMP messages received with checksum errors
    • unknown types—Number of IGMP messages received that are not group membership queries, group membership reports, or leave group membership messages
    • queries—Number of group membership queries
    • reports—Number of group membership reports
    • leaves—Number of leave group membership messages
  • IGMP Statistics Sent—Statistics for IGMP messages sent
    • Total number of group membership queries sent
• Example

  host1:boston#show ip igmp
  Routing Process IGMP, Administrative state enabled, Operational state enabled
      2 total interfaces, 2 enabled, 0 disabled
  0 enabled interfaces performing graceful restart
  2 learnt groups
  IGMP Statistics:
      Rvcd: 1 total, 0 checksum errors, 0 unknown types
            0 queries, 1 reports, 0 leaves
      Sent: 11 total

• See show ip igmp.

show ip igmp groups

• Use to display statically joined and directly connected groups learned through IGMP.
• 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, when a group or source has been mapped to an OIF
  • State—IGMP version on the interface
  • ExpTim—Time, in seconds, at which the router stops polling for more members of this group
  • oldHTo—Time at which the router stops polling for more IGMPv1 members of a group. If this value is 0, the interface has received no IGMPv1 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 ip igmp groups
  Grp Address     Interface       State       Reporter        ExpTim oldHTo
  --------------- --------------- ----------- --------------- ------ ------
  228.1.1.1       FastEthernet1/1 Version3    17.0.0.2            44      0
  228.1.1.2       FastEthernet1/1 Version3    17.0.0.2            50      0
  228.1.1.3       FastEthernet1/1 Version3    17.0.0.2            48      0
  230.1.1.1       FastEthernet1/1 Version3    17.0.0.2            44      0
    Included Sources:
      51.0.0.1                                                    44
      51.0.0.2                                                    44
      51.0.0.3                                                    44
  231.1.1.1       FastEthernet1/1 Version3    17.0.0.2            44      0
    Excluded Sources:
      51.0.0.1                                                     0
      51.0.0.2                                                     0
      51.0.0.3                                                     0

  Counts: 5 version-3, 0 version-2, 0 version-1, 0 check state, 0 disabled
         (5 total)
          0 excluded
          Source-groups: 3 included, 3 excluded

• Example 2—With OIF mapping

  host1:boston#show ip igmp groups
  Grp Address     Interface       State       Reporter        ExpTim oldHTo
  --------------- --------------- ----------- --------------- ------ ------
  232.1.1.1       ATM5/0.12       Version3    1.1.1.2            371      0
                      oif-map OIFMAP ATM5/0.121               
  232.1.1.1       ATM5/0.13       Version3    1.1.1.3            375      0
                      oif-map OIFMAP ATM5/0.121               
  232.1.1.2       ATM5/0.12       Version3    1.1.1.2            373      0
    Included Sources:
      10.1.1.2        oif-map OIFMAP self                        373
      10.1.1.10       oif-map OIFMAP ATM5/0.120                  373
      10.1.1.11       oif-map OIFMAP ATM5/0.121                  373
  232.1.1.2       ATM5/0.13       Version3    1.1.1.3            375      0
    Included Sources:
      10.1.1.2        oif-map OIFMAP self                        375
      10.1.1.10       oif-map OIFMAP ATM5/0.120                  375
      10.1.1.11       oif-map OIFMAP ATM5/0.121                  375
   
  Counts: 4 version-3, 0 version-2, 0 version-1, 0 check state, 0 disabled
         (4 total)
          0 excluded
          Source-groups: 6 included, 0 excluded

• See show ip igmp groups.

show ip igmp interface

• Use to display IGMP information for interfaces on which you enabled IGMP.
• Specify the brief keyword to see a summary of the information.
• Specify the count keyword to see the number of IGMP interfaces.
• Specify the group address keyword to see information for interfaces that belong to that group.
• Field descriptions
  • Interface—Type of interface and interface specifier. For details about interface types and specifiers, see Interface Types and Specifiers.
  • address—IP 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—IGMP version
  • State—Function of the interface: querier or nonquerier
  • Query Interval—Time interval in seconds at which this interface sends query messages
  • Other querier present interval—Time in seconds that the interface waits before declaring itself as the querier
  • Maximum response time—Time interval, in tenths of a second, during which this interface waits for a host to respond
  • Last member query interval—Time, in tenths of a second, 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 IGMP messages
  • Information about whether the interface accepts IGMP reports from hosts on any subnetwork
    • Interface defaults to global promiscuous mode—Interface uses the setting of the igmp promiscuous command to determine whether it accepts IGMP reports from hosts on any subnetwork
  • Information about standard IP access lists configured with the ip igmp access-group command
    • Inbound access group—Access list specified
    • No inbound access group—No access list specified
  • Information about IP access lists configured with the ip igmp 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 ip igmp 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 ip igmp immediate-leave command: enabled or disabled
  • Explicit Host Tracking—Setting of the ip igmp explicit-tracking command: enabled or disabled
  • Max-Group limit—Number of IGMP groups that the interface can accept, as configured with the ip igmp group limit command
  • Admission-Bandwidth limit—Value of the admission-bandwidth limit set for an interface that accepts IGMP groups, or No Limit
  • Group Count—Number of IGMP 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 IGMP messages received on this interface
    • reports—Number of group membership reports received
    • leaves—Number of group leave messages received
    • wrong version queries—Number of group membership queries received from devices running a different version of IGMP
  • Interface statistics Sent—Number of IGMP messages this interface has sent
  • Interface statistics Groups learned—Number of groups this interface has discovered
  • Counts—Breakdown of IGMP interfaces
    • down—Number of interfaces down
    • init state—Number of interfaces in the initialization state
    • querier—Number of querier interfaces
    • non-querier—Number of non-querier interfaces
    • Total—Total number of IGMP interfaces
• Example 1

  host1:boston#show ip igmp interface
  Interface ATM2/1.15 address 15.0.0.2/255.255.255.0
  Administrative state enabled, Operational state enabled
  Interface parameters:
      Version 2
      State Querier
      Query Interval 125 secs, 53 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
      Interface defaults to global promiscuous mode
      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
      Admission-Bandwidth limit: No Limit
      Group Count: 1
  Interface statistics:
      Rcvd: 0 reports, 0 leaves, 0 wrong version queries
      Sent: 1 queries
      Groups learned: 1

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

• Example 2

  host1#show ip igmp interface gigabitEthernet 3/0.0
  Interface GigabitEthernet3/0.0 address 10.1.1.1/255.255.255.0
  Administrative state enabled, Operational state disabled
  Interface parameters:
      Version 2
      State Down
      Query Interval 125 secs
      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
      Interface defaults to global promiscuous mode
      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
      Admission-Bandwidth 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: 0 queries
      Groups learned: 0

• See show ip igmp interface.

show ip igmp interface brief

• Use to display a summary of IGMP information for interfaces on which you enabled IGMP.
• Field descriptions
  • Interface—Type of interface and interface specifier. For details about interface types and specifiers, see Interface Types and Specifiers.
  • Intf Address—IP address of the interface
  • Ver—IGMP version
  • State—Function of the interface: querier or nonquerier
  • Querier—IP address of the querier on the network to which this interface connects
  • QTime—Time interval, in seconds, at which this interface sends query messages
  • QPTime—Time in seconds that the interface waits before declaring itself as the querier
  • Count—Total number of IGMP interfaces
• Example

  host1:boston# show ip igmp interface brief
  show ip igmp interface briefInterface        Intf Address     Ver  State    Querier        QTime  QPTime
  --------------   ----------       ---  ------   -------------  -----  --- 
  fastEthernet0/0  192.168.1.250/24  2   Querier  192.168.1.250  28     0
  atm3/0.2         21.1.1.1/8        2   Querier  21.1.1.1       26     0
  Count: 2 interfaces
  

• See show ip igmp interface.

show ip igmp 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—IGMP 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 ip igmp mapped-oif
  show ip igmp mapped-oif      OIF       Oper  Group Address  Source Address     Join I/F      Map Name 
  --------------- ---- --------------- --------------- --------------- ----------
  ATM5/0.120      Up   232.1.1.2       10.1.1.10       ATM5/0.12       OIFMAP    
                                                       ATM5/0.13       OIFMAP    
  ATM5/0.121      Up   232.1.1.1       *               ATM5/0.12       OIFMAP    
                                                       ATM5/0.13       OIFMAP    
                       232.1.1.2       10.1.1.11       ATM5/0.12       OIFMAP    
                                                       ATM5/0.13       OIFMAP    
   
  Counts: 3 source-group mappings
  

• See show ip igmp mapped-oif.

show ip igmp membership

• Use to display IGMP membership information for multicast groups and (S, G) channels.
• 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 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, 3—IGMP 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# show ip igmp membership
  Flags: M – Uses Oifmap  S– SSM mapped  T – tracked 
         1,2,3 – The version of IGMP 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
  ---------------  ---------------    -------------    ------    ------    ---------------
  224.0.1.40           *              10.10.1.1        02:41     2S        FastEthernet2/1
  224.0.1.50                          1/2              02:56     3MT       FastEthernet2/2 
                                      11.10.0.21       02:56
                                      11.10.2.22       02:30      
                   20.30.0.11         
                                      11.10.0.23       02:48     
                   20.30.0.12         
                                      11.10.0.21       02:56     
                   20.30.0.13         
                                      11.10.0.21       02:56 
                                      11.10.0.22       02:30     
                                      11.10.0.23       02:48     
  224.0.1.60                          20.20.0.1        01:56     3        FastEthernet2/3
                   10.30.0.100                         02:45
                   10.30.0.101                         02:35 
                   10.30.0.102                         02:15 
                   10.30.0.104                         stop
  224.0.1.70                          30.20.0.1        stop      3        FastEthernet2/4
                   40.30.0.100                         01:10
                   40.30.0.101                         01.24
  239.0.1.80                          2/0              stop      3T       FastEthernet2/5 
                   50.30.0.100        
                                      10.10.0.10       02:48     
                   50.30.0.101        
                                      10.10.0.20       02:56     
                                      10.10.0.10       02:48     
                   50.30.0.102        10.10.0.20       02:56     
  235.0.1.90                          0/3              02:56     2T       FastEthernet2/6 
                        *             
                                      12.10.0.10       02:48     
                                      12.10.0.20       02:56     
                                      12.10.0.30       02:48 
  

• See show ip igmp membership.

show ip igmp 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 IP prefix
  • Source Prefix—Source IP prefix
  • OIF—Outgoing interface associated with the group and source prefix
• Example

  host1#show ip igmp oif-map
  
  

       Map Name         Group Prefix      Source Prefix           OIF        
  ------------------ ------------------ ------------------ ------------------
  OIFMAP             232.1.1.0/24       0.0.0.0/0          ATM5/0.121        
                     232.1.1.0/24       10.1.1.2/32        self              
                     232.1.1.0/24       10.1.1.10/32       ATM5/0.120        
                     232.1.1.3/32       0.0.0.0/0          ATM5/0.130        
                     232.1.1.4/32       0.0.0.0/0          ATM5/0.130 

• See show ip igmp oif-map.

show ip igmp oif-mapping

• Use to display the mapped OIF that is 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—Interface associated with the OIF map
• Example

  host1#show ip igmp oif-mapping OIFMAP 232.1.1.1 10.1.1.10
   
      OIF Mapping
      OIF-MAP Name   : OIFMAP
      Group Address  : 232.1.1.1
      Source Address : 10.1.1.10
      Mapped OIF     : ATM5/0.120

• See show ip igmp oif-mapping.

show ip igmp 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 ip igmp ssm-mapping 232.1.1.1
  
  

      SSM Mapping   : Enabled
      Group Address : 232.1.1.1
      Source List   : 172.1.1.1
                    : 172.1.1.2

• See show ip igmp ssm-mapping.

show multicast group limit

• Use to display the number of IGMP 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 IGMP groups and ports for which you have configured a limit for the number of IGMP 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) and 0–13 (ERX-14xx models)
    • port—Port number on the I/O module
  • limit—Maximum number of IGMP groups that the port can accept. A value of –1 indicates that no limit has been specified.
  • count—Actual number of IGMP groups that 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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