Supermicro SSE-F3548S - Page 202

Supermicro SSE-F3548S/SSE-F3548SR Configuration User’s Guide
202
In simple multicast networks without IGMP routers, IGMP hosts will not send periodic membership
reports since there is no IGMP router to respond. Without periodic membership reports from hosts, a
switch will remove all multicast group entries on port purge timeouts. The removal of multicast group
entries on a switch will cause flooding of multicast traffic on all ports. To avoid this flooding, a switch can
be configured as an IGMP querier.
When a switch is configured as an IGMP querier, it will send periodic queries to hosts, similar to the action
of an IGMP router. This will make hosts send periodic IGMP reports and hence the multicast group entries
in switches will not time out.
Supermicro switches do not act as an IGMP querier by default. Users can configure the switch to act as an
IGMP querier for any required VLANs.
When a Supermicro switch acts as an IGMP querier, it sends queries every 125 seconds. This periodic time
interval can be configured for every VLAN.
Follow the steps below to configure a switch as an IGMP querier for any VLAN.
Step
Command
Description
Step 1
configure terminal
Enters the configuration mode.
Step 2
vlan<vlan-list>
Enters the VLAN configuration mode.
vlan-list – may be any VLAN number or
list of VLAN numbers. Multiple VLAN
numbers can be provided as comma-
separated values. Consecutive VLAN
numbers can be provided as a range,
such as 5-10.
If multiple VLANs are provided, the next
step will configure the switch as an
IGMP querier for all these VLANs.
Switch A
Receiver 1
Receiver 2
Multicast
Traffic
Source A