Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2219)

Appendix B: Glossary
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C B.29
V
VCStack
A group of two or more switches operating as a single switch. See Virtual Chassis
Stacking .
VCStack fast failover
VCStack Fast Failover provides absolutely minimal network downtime in the event of a
problem with the stack.
See the reboot rolling command on page 83.4 .
VID
VLAN Identifier or VLAN ID. When you create a VLAN you give it a numerical VID which is
included in VLAN-tagged Ethernet frames to and from this VLAN.
Virtual Chassis Stacking
Virtual Chassis Stacking (VCStack™) is the name given to two or more Allied Telesis
switches that are configured to operate as a single switch. From a configuration and
management point of view, it is as though the switches are just one device with a
seamless transition from the ports of one stack member to the ports of the next.
For more information see Chapter 82, VCStack Introduction .
VLAN classification
A packet can be allocated VLAN membership based on its protocol, subnet, or port.
VLAN ID
See VID .
VLAN identifier
See VID .
VLAN tag
IEEE standard 802.1q defines an additional 4 byte tag field that can be inserted
immediately following the MAC address, plus any routing fields present. This field contains
a 12 bit VLAN identifier, commonly referred to as the VLAN tag. The VLAN tag is used to
determine which VLAN a given frame should be forwarded to.
Other tags included in the 802.1q tag field is a Tag Protocol Identifier tag, and a Type of
Service tag used to determine data priority.
Voice VLAN
Voice VLAN automatically separates voice and data traffic into two different VLANS. This
automatic separation places delay-sensitive traffic into a voice-dedicated VLAN, which
simplifies QoS configurations.
For more information see “Voice VLAN” on page 70.3 .