Configuring Multicast Forwarding
IGMP Snooping
Cisco Small Business 300 Series Managed Switch Administration Guide 156
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There should be only one IGMP Querier in a Layer 2 Multicast domain. The switch
supports standards-based IGMP Querier election when more than one IGMP
Querier is present in the domain.
The speed of IGMP Querier activity should be aligned with the IGMP-snooping-
enabled switches. Queries should be sent at a rate that is aligned to the snooping
table aging time. If queries are sent at a rate lower than the aging time, the
subscriber cannot receive the Multicast packets.
To enable IGMP Snooping and identify the switch as an IGMP Snooping Querier on
a VLAN:
STEP 1 Click Multicast > IGMP Snooping. The
IGMP Snooping Page
opens.
The IGMP Snooping Table displays the IGMP snooping information for the VLANs
on the switch. The columns are described in STEP 4.
STEP 2 Check Enable (or disable) the IGMP Snooping status.
IGMP Snooping Status globally enables the device monitoring network traffic to
determine which hosts have requested to receive Multicast traffic. The switch
performs IGMP Snooping if IGMP snooping and Bridge Multicast filtering are both
enabled.
STEP 3 Select a VLAN, and click Edit. The
Edit IGMP Snooping Page
opens.
There should be only one IGMP Querier in a network. The switch supports
standards-based IGMP Querier election. Some of the values of the operational
parameters of this table are sent by the elected querier. The other values are
derived from the switch.
STEP 4 Enter the parameters.
• VLAN ID—Select the VLAN ID where IGMP snooping is defined.
• IGMP Snooping Status—Enable or disable the monitoring of network traffic
to determine which hosts have asked to be sent Multicast traffic. The switch
performs IGMP snooping only if IGMP snooping and Bridge Multicast
filtering are both enabled.
• Operational IGMP Snooping Status—Displays the current status of the
IGMP Snooping for the selected VLAN.
• MRouter Ports Auto Learn—Enable or disable auto learning of the ports to
which the Mrouter is connected.
• Query Robustness—Enter the Robustness Variable value to be used if this
switch is the elected querier.
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