Allied Telesis AR400 - Manual (Page 59)

Page 59 | AlliedWare™ OS How To Note: IGMP
How clients leave groups: queries and timers > Snooper timer values
The command show ip igmp displays the timer for the most recently updated port as
the group’s Refresh Time. From Software Version 291-08, the command show
igmpsnooping vlan={<vid>|all} detail displays the timers for each individual port.
Snooper timer values
As described in Step 5 above, when the Snooper receives a Specific Query from the Querier,
it may update a timer for ports that forward that group. The following flow chart describes
the decision-making process for updating the timer.
Note that:
z The command show igmpsnooping displays the timer for the most recently updated
port as the group’s Timeout in ... value. From Software Version 291-08, the command
show igmpsnooping vlan={<vid>|all} detail displays the timers for each individual
port.
For this
port, is the group
entry dynamic
(not static)?
Is the port’s
current timer ≥
LMQI from Querier
LMQC from
Snooper?
Start:
Switch receives
Query for which
it has a group
entry.
Has the switch
previously seen a
Leave message?
yes
yes
yes
no
no
no
Do not alter port-specific
group membership timer.
Flood Query out all ports.
Set port-specific group
membership timer to:
LMQI from Querier
LMQC from Snooper.