Vlan Terms; Vlan Terms And Definitions - Enterasys 6E2xx Local Management User’s Manual

13.4 VLAN TERMS

To fully understand the operation and configuration of port based VLANs, it is essential to
understand the definitions of several key terms.
Table 13-1 VLAN Terms and Definitions
VLAN Term
VLAN ID
VLAN Name
Egress
Ingress
Filtering Database
Identifier (FDB ID)
Tag Header (VLAN Tag)
Tagged Frame
Untagged Frame
Definition
A unique number (between 1 and 4094) that identifies a
particular VLAN. Up to 1000 VLANs can be created on one
SmartSwitch.
A 32-character alphanumeric name associated with a VLAN ID.
The VLAN Name is intended to make user-defined VLANs
easier to identify and remember.
Output direction of data from a network device.
Incoming direction of data to a network device.
Addressing information that the device learns about a VLAN is
stored in the filtering database assigned to that VLAN. Several
VLANs can be assigned to the same FDB ID to allow those
VLANs to share addressing information. This enables the devices
in the different VLANs to communicate with each other when the
individual ports have been configured to allow communication to
occur.
The configuration is accomplished using the Local Management
VLAN Forwarding Configuration screen. By default a VLAN is
assigned to the FDB ID 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.
VLAN Operation and Network Applications
VLAN Terms
13-5