Cabletron Systems 802.1Q manual Garp Switch Operation

Chapter 2: VLAN Operation

For example, assume that a frame is received by the switch depicted in Figure 2-1. This frame is a unicast untagged frame received on Port 3. The frame is then classified for VLAN C. The switch then makes its forwarding decision by comparing the destination MAC address to its filtering database. In this case, the MAC address is looked up in the filtering database FID 3, which is associated with VLAN C and VLAN D. The switch recognizes the destination MAC address of the frame as being located out Port 4.

Having made the forwarding decision, the switch now examines the Port VLAN List of Port 4 to determine if it may transmit a frame belonging to VLAN C. If so, the frame is transmitted out Port 4. If Port 4 has not been configured to transmit frames belonging to VLAN C, the frame is discarded.

2.5GARP SWITCH OPERATION

Some or all ports on the switch may be activated to operate under the Generic Attribute Registration Protocol (GARP) applications, GVRP and/or GMRP. For a description of the protocols and how the frames are handled, refer to the user’s guide of your SmartSwitch device.

2-6 802.1Q VLAN User’s Guide