Multicast Filtering
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Specifying Interfaces Attached to a Multicast Router
Depending on your network connections, IGMP snooping may not always be able to
locate the IGMP querier. Therefore, if the IGMP querier is a known multicast router/
switch connected over the network to an interface (port or trunk) on your switch, you
can manually configure that interface to join all the current multicast groups. This
can ensure that multicast traffic is passed to all the appropriate interfaces within the
switch.
Command Attributes
• Interface – Activates the Port or Trunk scroll down list.
• VLAN ID – Selects the VLAN to propagate all multicast traffic coming from the
attached multicast router/switch.
• Port or Trunk – Specifies the interface attached to a multicast router.
Web – Click IGMP, Static Multicast Router Port Configuration. Specify the interfaces
attached to a multicast router, indicate the VLAN which will forward all the
corresponding multicast traffic, and then click Add. After you have completed adding
interfaces to the list, click Apply.
Figure 3-108. Statically Configuring a VLAN to Forward Multicast Traffic
CLI – This example configures port 11 as a multicast router port within VLAN 1.
Console(config)#ip igmp snooping vlan 1 mrouter ethernet 1/11 4-232
Console(config)#exit
Console#show ip igmp snooping mrouter vlan 1 4-233
VLAN M'cast Router Port Type
---- ------------------ -------
1 Eth 1/11 Static
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