Cisco Small Business 200 Series

Multicast
IPv4 Multicast Configuration
Cisco Small Business 200 Series Smart Switch Administration Guide 216
17
IPv4 Multicast Configuration
The following pages configure IPv4 Multicast Configuration:
• IGMP Snooping Configuration
• IGMP VLAN Settings
IGMP Snooping Configuration
To support selective IPv4 Multicast forwarding, bridge Multicast filtering must be enabled (in the Multicast >
Properties page), and IGMP Snooping must be enabled globally and for each relevant VLAN in the IGMP
Snooping pages.
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.
STEP 2 Enable or disable the following features:
• IGMP Snooping Status—Select to enable IGMP snooping globally on all interfaces.
STEP 3 To configure IGMP proxy 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 IGMP group-specific queries sent before the device
assumes there are no more members for the group, if the device is the elected querier.
STEP 4 Select a VLAN, and click Edit.