Editing Trunking (section)

===VLAN===
In the context of Ethernet [[VLAN]]s, [[Cisco]] uses the term '''{{visible anchor|Ethernet trunking}}''' to mean carrying multiple VLANs through a single network link through the use of a trunking protocol.<ref>{{cite web |url=http://www.ciscopress.com/articles/article.asp?p=29803 |title=VLANs and Trunking |publisher=[[Cisco Press]] |date=2002-10-25 |access-date=2012-03-15}}</ref> To allow for multiple VLANs on one link, frames from individual VLANs must be identified. The most common and preferred method, [[IEEE 802.1Q]], adds a tag to the [[Ethernet frame]] labeling it as belonging to a certain VLAN. Since 802.1Q is an [[open standard]] it can work with equipment from any vendor. Cisco also has a (now deprecated) proprietary trunking protocol called [[Cisco Inter-Switch Link|Inter-Switch Link]] which encapsulates the Ethernet frame with its own container, which labels the frame as belonging to a specific VLAN. [[3Com]] used proprietary ''Virtual LAN Trunking'' (VLT) before 802.1Q was defined.<ref>{{Cite book |title=SuperStack II Switch 3000 TX 8 Port User Guide |date=June 1997 |chapter=Connecting Common VLANs Between Switch Units |id=Document No. DUA1694-1AAA04 }}</ref>