What Are Garp And Gmrp; Default L2 Multicast Values - Dell PowerConnect 7048P Manual

Powerconnect 7000 series stackable layer 2 and 3 switches

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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 7000 Series 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

information.

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

function properly.

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

IGMP/MLD snooping auto-learn

IGMP/MLD snooping host timeout

Configuring L2 Multicast Features

Default Value

None configured

Forward unregistered

Disabled on all interfaces