Cisco Cisco SG300-28 28-Port Gigabit Managed Switch Maintenance Manual

Access Port Multicast TV VLAN

Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 

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The port’s Frame Type parameter is set to Admit All, allowing untagged 
packets (see 

The Multicast TV VLAN configuration is defined per port. Customer ports are 
configured to be member of Multicast TV VLANs using the Multicast TV VLAN 
Page.

Multicast TV VLAN relies on IGMP snooping, which means that:

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Subscribers use IGMP messages to join or leave a Multicast group.

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Device performs IGMP snooping and configures the access port according 
to its Multicast membership on Multicast TV VLAN

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The device decides for each IGMP packet that is received on an access port 
whether to associate it with the access VLAN or with the Multicast TV VLAN 
according to the following rules:

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If an IGMP message is received on an access port, with destination 
Multicast IP address that is associated with the port’s Multicast TV VLAN, 
then the software associates the IGMP packet with the Multicast TV VLAN. 

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Otherwise the IGMP message is associated to the access VLAN and the 
IGMP message is only forwarded within that VLAN.

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The IGMP message is discarded if:

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The STP/RSTP state on the access port is discard.

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The MSTP state for the access VLAN is discard.

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The MSTP state for the Multicast TV VLAN is discard, and the IGMP 
message is associated with this Multicast TV VLAN.

VLAN Membership

Source and all receiver 
ports must be static 
members in the same 
data VLAN.

Source and receiver ports 
cannot be members in the 
same data VLAN.