User`s guide

Example 3
DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide 4-17
The switch checks the Filtering Database for the MAC address of
User B. User B’s MAC address is located, and port 2 is identified as
the location of User B. The frame is checked against the Egress List
for port 2. Port 2’s Egress List contains all VLANs, and is a 1Q Trunk
port, so the frame is transmitted, tagged, out port 2.
7. Switch 4 receives the frame on its 1Q port and examines the frame’s
Tag. The frame maintains its Default VLAN classification. The switch
also refers to its Source Address Table to see if it can locate an entry
for User B. User B is found to be located on port 1. The switch also
updates its Source Address Table with the port and MAC address
combination for the Mail Server.
The switch examines the Filtering Database and locates the MAC
address entry for User B and port 1. The frame is then checked against
the Egress List for port 1. As port 1 is considered eligible to transmit
to the Default VLAN and the switch is in the open mode, the frame is
forwarded out port 1 and the tag is removed.
8. Bridge 1 receives the frame and recognizes User B’s MAC address.
The frame is forwarded to the correct interface and the bridge’s Source
Address Table is updated with an entry for the Mail Server’s MAC
address. User B receives the Mail Server’s response. Any further
unicast traffic between the Mail Server and User B will be handled in
the same fashion by the switches in the network.