Allied Telesis AR400 manual X A client leaves a group

IGMP debugging > Example

XA client leaves a group

Client 2 sends a Leave message for group 224.12.13.14. Switch 1 sees the Leave message on vlan100 (port 49). The port is in a state of “deferred deletion” because of the Last Member Query process (see "Last Member Query Count and Last Member Query Interval" on page 72).

Switch 1 is an IGMP Querier, so it sends out two Membership Queries and waits 2 seconds for a response. None arrives, so switch 1 deletes the entry.

Manager Switch 1> IGMP Snoop(48) on vlan100: Leave -> IGMP Snoop(48): Leave g. group 224.12.13.14 - Port 49 in deferred deletion.

IGMP Rx(48) on vlan100: Leave -> IGMP Rx(48): Leave group=224.12.13.14 -> group .

Several minutes later the group entry times out.

Manager Switch 1> IGMP Snoop Timeout: group=224.12.13.14 (0) is deleted Deleting all ports for group 224.12.13.14 on vlan100

IGMP Timeout: group=224.12.13.14 (0) is deleted

Meanwhile, switch 3, which has the client attached to it, sees the same sequence but debugs it differently. Like switch 1, switch 3 logs the Leave message, but its output also includes the port on which it received the Leave message. This enables you to identify the client. Switch 3 also logs the two Specific Queries and notes the 2 second timeout. After 2 seconds it also deletes the entry from its IGMP snooping table.

Manager Switch 3> IGMP Snoop: resending pkt to vlan utPorts: 1-4,6-26 fwdPorts: 26

IGMP Snoop(2) on vlan100: Leave -> IGMP Snoop(2): Leave group=224.12.13.14-> gr. group 224.12.13.14 - Port 3 in deferred deletion.

IGMP MVR Snoop: discard - no MVR snooper for code 23

IGMP Snoop: resending pkt to vlan utPorts: 1-4,6-26 fwdPorts: 3,26

IGMP Snoop(25) on vlan100: Query -> code 10

igmpSnoopMembershipQuery >> setting timer at 2 secs for group 224.12.13.14

snooped group 224.0.0.2 added

Adding port 26 for group 224.0.0.2 on vlan100

IGMP MVR Snoop: discard - no MVR snooper for code 17

Manager Switch 3> IGMP Snoop: resending pkt to vlan utPorts: 1-4,6-26 fwdPorts: 3,26

IGMP Snoop(25) on vlan100: Query -> code 10

igmpSnoopMembershipQuery >> setting timer at 2 secs for group 224.12.13.14

snooped group 224.0.0.2 added

Adding port 26 for group 224.0.0.2 on vlan100

IGMP MVR Snoop: discard - no MVR snooper for code 17

Manager Switch 3> IGMP Snoop Timeout: group=224.12.13.14 (0) is deleted Deleting all ports for group 224.12.13.14 on vlan100

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