LevelOne GSW-4876 - Manual (Page 140)

C HAPTER 4 | Configuring the Switch
Multicast VLAN Registration
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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).
Figure 52: MVR Concept
C ONFIGURING
G ENERAL MVR
S ETTINGS
Use the MVR Configuration page to enable MVR globally on the switch,
select the VLAN that will serve as the sole channel for common multicast
streams supported by the service provider, and to configure each interface
that participates in the MVR protocol as a source port or receiver port.
P ATH
Advanced Configuration, MVR
C OMMAND U SAGE
◆ General Configuration Guidelines for MVR:
1. Enable MVR globally on the switch, and select the MVR VLAN.
2.
Set the interfaces that will join the MVR as source ports or receiver
ports.
3.
If you are sure that only one subscriber attached to an interface is
receiving multicast services, you can enable the immediate leave
function.
◆ Although MVR operates on the underlying mechanism of IGMP
snooping, the two features operate independently of each other. One
can be enabled or disabled without affecting the behavior of the other.
However, if IGMP snooping and MVR are both enabled, MVR reacts only
to join and leave messages from multicast groups configured under
MVR. Join and leave messages from all other multicast groups are
managed by IGMP snooping. Also, note that only IGMP version 2 or 3
hosts can issue multicast leave messages. Immediate leave therefore
cannot be used for IGMP version 1 clients.
Multicast Router
Layer 2 Switch
Multicast Server
PC
TV
Set-top Box
TV
Set-top Box
Satellite Services
Service
Network
Source
Port
Receiver
Ports