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Local Management Supplement 4-1
CHAPTER 4
GENERIC ATTRIBUTE REGISTRATION
PROTOCOL (GARP)
This appendix provides the following information:
• Describes the switch operation when its ports are configured to operate
under the Generic Attribute Registration Protocol (GARP)
applications – GARP VLAN Registration Protocol (GVRP) and/or
GARP Multicast Registration Protocol (GMRP).
• Describes the GARP Configuration screen and how to use it to
enable/disable GVRP and GMRP on the switch and set each port to
operate as a GVRP- and/or GMRP-aware port.
• Describes the GMRP Configuration screen and how to use it to select
individual ports, or all of the ports, and apply one of four modes of
operation according to, or regardless of, the multicast address
registration.
4.1 GARP SWITCH OPERATION
Some or all ports on the switch may be activated to operate under the
GARP applications, GVRP and/or GMRP. A description of how GVRP
and GMRP handle frames under GARP is described in Section 4.1.1 and
Section 4.2.
4.1.1 GARP VLAN Registration Protocol (GVRP)
The process of the forwarding decision and tagging frames is the same as
for 802.1Q as described in the Cabletron Systems 802.1Q VLAN User’s
Guide. However, the GVRP protocol frames will not have a tag even
when transmitted out a 1Q Trunk Port.