User's Manual

Table Of Contents
324
Users Manual of CS-6306R
Chapter 31. IGMP-Proxy Configuration
IGMP-proxy Configuration 31.1
31.1.1.1 IGMP-proxy Configuration Tasks
The IGMP Proxy allows the VLAN where the multicast user is located to receive the multicast source from
other VLANs. The IGMP Proxy runs on layer 2 independently without other multicast routing protocols. IGMP
proxy will be transmitted by the IGMP packets of the proxied VLAN to the proxying VLAN and maintain the
hardware forward table of the multicast user of the agent VLAN according to these IGMP packets. IGMP
proxy divides different VLANs into two kinds: proxied VLANs and proxying VLANs. The downstream multicast
VLANs can be set to the proxied VLANs, while the upstream multicast VLANs can be set to the proxying
VLANs.
Although IGMP proxy is based on IGMP snooping, two are independent in application; IGMP Snooping will
not be affected when IGMP proxy is enabled or disabled, while IGMP proxy can run only when IGMP
Snooping is enabled.
IGMP proxy cannot be used unless the following conditions are met:
(1) L3 switch
(2) Avoiding to enable IP multicast routing at the same time
(3) Preventing a vlan to act as downstream vlan and also upstream vlan
Enabling/Disabling IGMP-Proxy
Adding/deleting VLAN agent relationship
Adding/deleting static multicast source entries
Monitoring and Maintaining IGMP-Proxy
Setting the Example of IGMP Proxy
31.1.1.2 Enabling/Disabling IGMP-Proxy
Run the following commands in global configuration mode.
Command Purpose
ip igmp-proxyenable
Enables IGMP proxy.
no ip igmp-proxyenable
Resumes the default settings.
IGMP-proxy cannot be enabled after IP multicast-
routing is enabled. The previously
enabled IGMP proxy is automatically shut down if IP multicast routing is enabled.
The shutdown of ip multicast-routing will not lead to the automatic enablement of
IGMP proxy.