Igmp Debugging - Allied Telesis AR400 Series How To Configure

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
page
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
Page 104 | AlliedWare™ OS How To Note: IGMP
A client leaves a group
"Last Member Query Count and Last Member Query Interval" on
72).
IGMP debugging > Example