Cabletron Systems 802.1Q Manual De Usuario

 

The configuration is accomplished using the Local Management VLAN 
Forwarding Configuration screen. By default a VLAN is assigned to the 
FID that matches its VLAN ID.

 

Four bytes of data inserted in a frame that identifies the VLAN/frame 
classification. The Tag Header is inserted into the frame directly after the 
Source MAC address field. Twelve bits of the Tag Header represent the 
VLAN ID. The remaining bits are other control information.

 

A data frame that contains a Tag Header. A VLAN aware device can add 
the Tag Header to any frame it transmits.

 

A data frame that does not have a Tag Header.

 

The VLAN to which all ports are assigned upon initialization. The 
Default VLAN has a VLAN ID of 1 and cannot be deleted or renamed.

 

A list of the ports on a particular device that are eligible to transmit 
frames for a selected VLAN. 

 

A per port list of all eligible VLANs whose frames can be forwarded out 
one specific port and the frame format (tagged or untagged) of 
transmissions for that port. The Port VLAN List specifies what VLANs 
are associated with a single port for frame transmission purposes.

 

A database structure within the switch that keeps track of the associations 
between MAC addresses, VLANs, and interface (port) numbers. The 
Filtering Database is referred to when a switch makes a forwarding 
decision on a frame.

 

A connection between 802.1Q switches that passes only traffic with a 
VLAN Tag Header inserted in the frame. By default, a port designated as 
a 1Q Trunk port has all VLANs in its Port VLAN List and is configured to 
transmit all frames as tagged frames. A 1Q Trunk drops all incoming 
frames that do not have a VLAN tag.