Chapter 20
| Multicast Filtering Commands
IGMP Snooping
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To resolve this problem, the source address in proxied IGMP query and report
messages can be replaced with any valid unicast address (other than the router's
own address) using this command.
Rules Used for Proxy Reporting
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:
â—† 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.
Example
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)#
ip igmp snooping vlan
query-interval
This command configures the interval between sending IGMP general queries. Use
the no form to restore the default.
Syntax
ip igmp snooping vlan vlan-id query-interval interval
no ip igmp snooping vlan vlan-id query-interval
vlan-id - VLAN ID (Range: 1-4093)
interval - The interval between sending IGMP general queries.
(Range: 2-31744 seconds)
Default Setting
125 seconds
Command Mode
Global Configuration
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