VLAN identification logically identifies
which packets belong to which VLAN group. Multiple trunking
methodologies exist, as follows:
- IEEE 802.1Q - This protocol is an
IEEE standard method for identifying VLANs by inserting a VLAN
identifier into the frame header. This process is referred to as
frame tagging.
- ISL - This protocol is a Cisco
proprietary encapsulation protocol for interconnecting multiple
switches; it is supported in switches as well as routers.
- 802.10 - This standard is a Cisco
proprietary method of transporting VLAN information inside the
standard 802.10 frame (FDDI) - The VLAN information is written
to the security association identifier (SAID) portion of the
802.10 frame. This method is typically used to transport VLANs
across FDDI backbones.
- LAN Emulation (LANE) - LANE is an
ATM Forum standard that can be used for transporting VLANs over
Asynchronous Transfer Mode (ATM) networks.
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