A trunk is a switch port that can carry multiple traffic types, each tagged with a unique VLAN ID. As data is switched across the trunk port or trunk link, it is tagged (or coloured) by the egress switch trunk port, which allows the receiving switch to identify that it belongs to a particular VLAN. On the receiving switch ingress port, the tag is removed and the data is forwarded to the intended destination.
The first configuration task when implementing VLAN trunking in Cisco IOS Catalyst switches is to configure the desired interface as a Layer 2 switch port. This . . .
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