EDS-510A Series User’s Manual Featured Functions
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GMRP (GARP Multicast Registration Protocol)
The EDS-510A supports IEEE 802.1D-1998 GMRP (GARP Multicast Registration Protocol),
which differs from IGMP (Internet Group Management Protocol). GMRP is a MAC-based
multicast management protocol, whereas IGMP is IP-based. GMRP provides a mechanism that
allows bridges and end stations to register or de-register Group membership information
dynamically. GMRP functions similarly to GVRP, except that GMRP registers multicast addresses
on ports. When a port receives a GMRP-join message, it will register the multicast address to its
database if the multicast address is not registered, and all the multicast packets with that multicast
address are able to be forwarded from this port. When a port receives a GMRP-leave message, it
will de-register the multicast address from its database, and all the multicast packets with this
multicast address are not able to be forwarded from this port.
Static Multicast MAC
Some devices may only support multicast packets, but not support either IGMP Snooping or
GMRP. The EDS-510A supports adding multicast groups manually to enable multicast filtering.
Enabling Multicast Filtering
Use the serial console or Web interface to enable or disable IGMP Snooping and IGMP querying.
If IGMP Snooping is not enabled, then IP multicast traffic is always forwarded, flooding the
network.
Configuring IGMP Snooping
IGMP Snooping provides the ability to prune multicast traffic so that it travels only to those end
destinations that require that traffic, thereby reducing the amount of traffic on the Ethernet LAN.
IGMP Snooping Settings
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