Generic Attribute Registration Protocol (Garp); Operation; A.1 Operation - Enterasys 6E2xx Local Management User’s Manual

Generic Attribute Registration Protocol
This appendix describes the switch operation when its ports are operating under the Generic
Attribute Registration Protocol (GARP) application – GARP VLAN Registration Protocol
(GVRP).
NOTE: There is a global setting for GVRP that is enabled by default. Access to these
settings is only available through a MIB.
A.1

OPERATION

The process of the forwarding decision and tagging frames is the same as for 802.1Q as described
in Chapter 13. However, the GVRP protocol frames will not have a tag even when transmitted out
a 1Q Trunk Port.
The purpose of GVRP is to dynamically create VLANs across a switched network. When a VLAN
is declared, the information is transmitted out GVRP configured ports on the switch in a GARP
formatted frame using the GVRP multicast MAC address. A switch that receives this frame,
examines the frame, and extracts the VLAN IDs. GVRP then creates the VLANs and adds the
receiving port to its tagged member list for the extracted VLAN IDs). The information is then
transmitted out the other GVRP configured ports of the switch.
how VLAN blue from end station A would be propagated across a switch network.

Generic Attribute Registration Protocol (GARP)

(GARP)
Figure A-1 shows an example of
A
A-1