User Guide 296
Configuring Layer 2 Multicast Layer 2 Multicast
1.2 Supported Features
Layer 2 Multicast protocol for IPv4: IGMP Snooping
On the Layer 2 device, IGMP Snooping transmits data on demand on data link layer by
analyzing IGMP packets between the IGMP querier and the users, to build and maintain
Layer 2 multicast forwarding table.
Layer 2 Multicast protocol for IPv6: MLD Snooping
On the Layer 2 device, MLD Snooping (Multicast Listener Discovery Snooping) transmits
data on demand on data link layer by analyzing MLD packets between the MLD querier and
the users, to build and maintain Layer 2 multicast forwarding table.
Multicast VLAN Registration (MVR)
MVR allows a single multicast VLAN to be shared for multicast member ports in different
VLANs in IPv4 network. In IGMP Snooping, if member ports are in different VLANs, a copy
of the multicast streams is sent to each VLAN that has member ports. While MVR provides
a dedicated multicast VLAN to forward multicast traffic over the Layer 2 network, to avoid
duplication of multicast streams for clients in different VLANs. Clients can dynamically join
or leave the multicast VLAN without interfering with their relationships in other VLANs.
There are two types of MVR modes:
■ Compatible Mode
In compatible mode, the MVR switch does not forward report or leave messages from
the hosts to the IGMP querier. So the IGMP querier cannot learn the multicast groups
membership information from the MVR switch. You have to statically configure the IGMP
querier to transmit all the required multicast streams to the MVR switch via the multicast
VLAN.
■ Dynamic Mode
In dynamic mode, after receiving report or leave messages from the hosts, the MVR switch
will forward them to the IGMP querier via the multicast VLAN (with appropriate translation of
the VLAN ID). So the IGMP querier can learn the multicast groups membership information
through the report and leave messages, and transmit the multicast streams to the MVR
switch via the multicast VLAN according to the multicast forwarding table.
Multicast Filtering
Multicast Filtering allows you to control the set of multicast groups to which a host can
belong. You can filter multicast joins on a per-port basis by configuring IP multicast profiles
(IGMP profiles or MLD profiles) and associating them with individual switch ports.
To Next Page
Loading...
Need help?
General
