What Are GARP and GMRP?
Generic Attribute Registration Protocol (GARP) is a general-purpose protocol
that registers any network connectivity or membership-style information.
GARP defines a set of switches interested in a given network attribute, such
as VLAN ID or multicast address.
PowerConnect M6220, M6348, M8024, and M8024-k switches can use GARP
functionality for two applications:
GARP VLAN Registration Protocol (GVRP) to help dynamically manage
VLAN memberships on trunk ports
GARP Multicast Registration Protocol (GMRP) to help control the
flooding of multicast traffic by keeping track of group membership
GVRP and GMRP use the same set of GARP Timers to specify the amount of
time to wait before transmitting various GARP messages.
GMRP is similar to IGMP snooping in its purpose, but IGMP snooping is
more widely used. GMRP must be running on both the host and the switch to
Default L2 Multicast Values
All L2 multicast features are disabled by default. Details about the L2
multicast are in Table 25-1.
Table 25-1. L2 Multicast Defaults
Bridge Multicast Filtering
IGMP Snooping mode
MLD Snooping mode
Bridge multicast group
Bridge multicast forwarding mode
IGMP/MLD snooping auto-learn
IGMP/MLD snooping host timeout
Configuring L2 Multicast Features
Disabled on all interfaces