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802.1q

Supports simultaneous tagged and untagged traffic.

802.1q

Assigned a default PVID, and all untagged traffic travels on the port default PVID.

802.1q

All untagged traffic and tagged traffic with a null VLAN ID are assumed to belong to the port default PVID.

802.1q

A packet with a VLAN ID equal to the outgoing port default PVID is sent untagged. All other traffic is sent with a VLAN tag.

802.1q

Frame size of 68 to 1522 bytes

ISL

All received packets are expected to be encapsulated and all transmitted packets are sent with this header.

ISL

Native (non-tagged) frames received from this type of trunk port are dropped.

ISL

This is no longer a recommended trunk port mode, and it is not supported on a number of Cisco switches.

ISL

Frame size of 94 to 1548 bytes

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