Multicast
IPv4 Multicast Configuration
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4 271
15
To enable IGMP Snooping and identify the device as an IGMP Snooping Querier on a VLAN:
STEP 1 Click Multicast > IPv4 Multicast Configuration > IGMP Snooping.
When IGMP Snooping is globally enabled, the device monitoring network traffic can
determine which hosts have requested to receive Multicast traffic. The device performs IGMP
Snooping only if both IGMP snooping and Bridge Multicast filtering are enabled.
The IGMP Snooping Table is displayed. The fields displayed are described in the Edit page
below. In addition the following fields are displayed:
• IGMP Snooping Status—Displays whether IGMP Snooping was enabled
(Administrative) and whether it is actually running on the VLAN (Operational).
• IGMP Querier Status—Displays whether IGMP Querier was enabled
(Administrative) and whether it is actually running on the VLAN (Operational).
Enable or disable the following features:
• IGMP Snooping Status—Select to enable IGMP snooping globally on all interfaces.
• IGMP Querier Status—Select to enable IGMP querier globally on all interfaces.
STEP 2 To configure IGMP on an interface, select a static VLAN and click Edit. Enter the following
fields:
• IGMP Snooping Status—Select to enable IGMP Snooping on the VLAN. The device
monitors network traffic to determine which hosts have asked to be sent Multicast
traffic. The device performs IGMP snooping only when IGMP snooping and Bridge
Multicast filtering are both enabled.
• MRouter Ports Auto Learn—Select to enable Auto Learn of the Multicast router.
• Immediate Leave—Select to enable the switch to remove an interface that sends a
leave message from the forwarding table without first sending out MAC-based general
queries to the interface. When an IGMP Leave Group message is received from a host,
the system removes the host port from the table entry. After it relays the IGMP queries
from the Multicast router, it deletes entries periodically if it does not receive any IGMP
membership reports from the Multicast clients. When enabled, this feature reduces the
time it takes to block unnecessary IGMP traffic sent to a device port.
• Last Member Query Counter—Number of MLD group-specific queries sent before
the device assumes there are no more members for the group, if the device is the elected
querier.
- Use Query Robustness (x)—This value is set in MLD Interface Settings page. The
number in parentheses is the current query robustness value.
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