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Chapter 39: Multicast Filtering Commands
IGMP Snooping
ip igmp snooping
vlan query-interval
When IGMP Proxy Reporting is disabled, the switch will use a null IP
address for the source of IGMP query and report messages unless a proxy
query address has been set.
When IGMP Proxy Reporting is enabled, the source address is based on the
following criteria:
If a proxy query address is configured, the switch will use that address
•
as the source IP address in general and group-specific query messages
sent to downstream hosts, and in report and leave messages sent
upstream from the multicast router port.
•
If a proxy query address is not configured, the switch will use the
VLAN's IP address as the IP source address in general and group-
specific query messages sent downstream, and use the source address
of the last IGMP message received from a downstream host in report
and leave messages sent upstream from the multicast router port.
E
XAMPLE
The following example sets the source address for proxied IGMP query
messages to 10.0.1.8.
Console(config)#ip igmp snooping vlan 1 proxy-address 10.0.1.8
Console(config)#
This command configures the interval between sending IGMP general
queries. Use the no form to restore the default.
S
YNTAX
ip igmp snooping vlan vlan-id query-interval interval
no ip igmp snooping vlan vlan-id query-interval
vlan-id - VLAN ID (Range: 1-4094)
interval - The interval between sending IGMP general queries.
(Range: 2-31744 seconds)
D
S
EFAULT
ETTING
125 seconds
C
M
OMMAND
ODE
Global Configuration
C
U
OMMAND
SAGE
•
An IGMP general query message is sent by the switch at the interval
specified by this command. When this message is received by
downstream hosts, all receivers build an IGMP report for the multicast
groups they have joined.
– 1165 –
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