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HAPTER
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| Multicast Filtering
Multicast VLAN Registration
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To display detailed information about the current multicast groups learned
through IGMP:
1. Click Multicast, IGMP, Group Information.
2. Select Show Detail from the Action list.
3. Select a VLAN. The selected entry must be a configured IP interface.
Figure 249: Displaying Multicast Groups Learned from IGMP (Detail)
MULTICAST VLAN REGISTRATION
Multicast VLAN Registration (MVR) is a protocol that controls access to a
single network-wide VLAN most commonly used for transmitting multicast
traffic (such as television channels or video-on-demand) across a service
provider’s network. Any multicast traffic entering an MVR VLAN is sent to
all attached subscribers. This protocol can significantly reduce to
processing overhead required to dynamically monitor and establish the
distribution tree for a normal multicast VLAN. This makes it possible to
support common multicast services over a wide part of the network
without having to use any multicast routing protocol.
MVR maintains the user isolation and data security provided by VLAN
segregation by passing only multicast traffic into other VLANs to which the
subscribers belong. Even though common multicast streams are passed
onto different VLAN groups from the MVR VLAN, users in different IEEE
802.1Q or private VLANs cannot exchange any information (except through
upper-level routing services).
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