Tagging rules for hybrid ports

Details Tagging rules for hybrid ports Tagging rules for hybrid ports

2004-12-13

2008-12-02

Abelson, Ronald (Department: 2619)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S389000, C370S392000, C370S396000, C370S401000

Reexamination Certificate

active

07460542

ABSTRACT:
A VLAN tagging method employed in a data communications switching device is disclosed. VLAN tagging is processed in accordance with one of a plurality of VLAN tagging modes, namely, a fixed port mode, a tagged port mode, a protocol-enforced port mode, a protocol-enforced port mode, and a standards-observant mode. The fixed port mode applies a VLAN tag with a default VLAN identifier associated with the ingress port. The tagged port mode preserves the tag received with the packet, or appends a new tag with a default VLAN identifier if the incoming VLAN tag is not present. In the protocol-enforced port mode, the VLAN identifier is selected based on the protocol type of the received PDU. In the standards-observant mode, an incoming VLAN tag is retained if present, or a new tag selected based on the protocol type of the received PDU if the received packet is untagged.

REFERENCES:
patent: 5309437 (1994-05-01), Perlman et al.
patent: 6236659 (2001-05-01), Pascoe
patent: 2002/0101868 (2002-08-01), Clear et al.
patent: 2002/0131411 (2002-09-01), Bhatia
patent: 2002/0191628 (2002-12-01), Liu et al.

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