Allied Telesis AR400 - Manual (Page 105)

Page 105 | AlliedWare™ OS How To Note: IGMP
IGMP debugging > Example
Client 2 sends a Membership Report for group 224.12.13.14. Switch 1 sees the report on
vlan100 (port 49) and adds an entry. The entry eventually expires.
Switch 3—a Snooper—sees a Version 2 Membership Query message on vlan100 from the
Querier and forwards it to all ports in the same VLAN. In the debugging output, the list of
ports is the fwdports list. If we take a port out of the VLAN, the fwdports list changes.
X A port entry times out
Manager Switch 1> IGMP Snoop(48): Report -> snooped group 224.12.13.14 added
Adding port 49 for group 224.12.13.14 on vlan100
IGMP Rx(48): Report -> group 224.12.13.14 added
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
X Snooped ports change
Manager Switch 3> IGMP Snoop: resending pkt to vlan
utPorts: 1-26 fwdPorts: 1-26
IGMP Snoop(25) on vlan100: Query -> code 100
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> del vlan=100 port=5
Info (1089003): Operation successful.
Manager Switch 3> IGMP Snoop: resending pkt to vlan
utPorts: 1-4,6-26 fwdPorts: 1-4,6-26
IGMP Snoop(25) on vlan100: Query -> code 100
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