32.2.2 Checking IGMP snooping

The following describes the IGMP snooping contents to be checked when IGMP snooping functionality is used.

<Structure of this section>

(1) Confirmation after configuration setting

Execute the show igmp-snooping command to check that the settings related to IGMP snooping are correct.

Figure 32-1: Displays IGMP snooping setting status.
> show igmp-snooping 100 Date 20XX/10/01 15:20:00 UTC VLAN: 100 IP address: 192.168.11.20/24 Querier: enable IGMP querying system: 192.168.11.20 Querier version: V2 IPv4 Multicast routing: Off Fast-leave: On Port(5): 1/0/1-5 Mrouter-port: 1/0/1,3 Group Counts: 3

Figure 32-1: Displays IGMP snooping setting status.

> show igmp-snooping 100
Date 20XX/10/01 15:20:00 UTC
VLAN: 100
  IP address: 192.168.11.20/24    Querier: enable
  IGMP querying system: 192.168.11.20
  Querier version: V2
  IPv4 Multicast routing: Off
  Fast-leave: On
  Port(5): 1/0/1-5
  Mrouter-port: 1/0/1,3
  Group Counts: 3

(2) Confirmation during operation

Execute the following command to check the status of IGMP snooping during operation.

Use the show igmp-snooping group command to check learned MAC addresses, IPv4 multicast addresses forwarded within a VLAN, and a list of forwarding destination port statuses.

Figure 32-2: Result of executing show igmp-snooping group command
> show igmp-snooping group 100 Date 20XX/02/01 15:20:00 UTC VLAN counts: 1 VLAN: 100 Group counts: 3 IPv4 Multicast routing: Off Group Address MAC Address Version Mode 224.10.10.10 0100.5e0a.0a0a V2 - Port-list:1/0/1-3 225.10.10.10 0100.5e0a.0a0a V3 INCLUDE Port-list:1/0/1-2 239.192.1.1 0100.5e40.0101 V2,V3 EXCLUDE Port-list:1/0/1

Figure 32-2: Result of executing show igmp-snooping group command

> show igmp-snooping group 100
Date 20XX/02/01 15:20:00 UTC
VLAN counts: 1
VLAN: 100  Group counts: 3  IPv4 Multicast routing: Off
  Group Address     MAC Address         Version         Mode
  224.10.10.10      0100.5e0a.0a0a      V2              -
    Port-list:1/0/1-3
  225.10.10.10      0100.5e0a.0a0a      V3              INCLUDE
    Port-list:1/0/1-2
  239.192.1.1       0100.5e40.0101      V2,V3           EXCLUDE
    Port-list:1/0/1

Use the show igmp-snooping port command to check the participation group display example for each port.

Figure 32-3: Result of executing show igmp-snooping port command
> show igmp-snooping port 1/0/1 Date 20XX/10/01 15:20:00 UTC Port 1/0/1 VLAN counts: 2 VLAN: 100 Group counts: 2 Group Address Last Reporter Uptime Expires 224.10.10.10 192.168.1.3 00:10 04:10 239.192.1.1 192.168.1.3 02:10 03:00 VLAN: 150 Group counts: 1 Group Address Last Reporter Uptime Expires 239.10.120.1 192.168.15.10 01:10 02:30

Figure 32-3: Result of executing show igmp-snooping port command

> show igmp-snooping port 1/0/1
Date 20XX/10/01 15:20:00 UTC
Port 1/0/1  VLAN counts: 2
  VLAN: 100  Group counts: 2
    Group Address     Last Reporter      Uptime     Expires
    224.10.10.10      192.168.1.3        00:10      04:10
    239.192.1.1       192.168.1.3        02:10      03:00
  VLAN: 150  Group counts: 1
    Group Address     Last Reporter      Uptime     Expires
    239.10.120.1      192.168.15.10      01:10      02:30