Enterasys 6000 Betriebsanweisung

This appendix describes the switch operation when its ports are operating under the Generic 
Attribute Registration Protocol (GARP) application – GARP VLAN Registration Protocol 
(GVRP).

The process of the forwarding decision and tagging frames is the same as for 802.1Q as described 
in 

. 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. 

 shows an example of 

how VLAN blue from end station A would be propagated across a switch network. 

NOTE: There is a global setting for GVRP that is enabled by default. Access to these 
settings is only available through a MIB.