Automatic VLAN ID discovery for ethernet ports

Details Automatic VLAN ID discovery for ethernet ports Automatic VLAN ID discovery for ethernet ports

2005-10-27

2009-02-24

Shah, Chirag G (Department: 2419)

Multiplex communications

Network configuration determination

Reexamination Certificate

active

07496052

ABSTRACT:
A method, system and network protocol that enables each host within a virtual local area network (VLAN) environment to automatically discover to which VLANs the host belongs. When a host initially sets up a communication interface, the host generates a series of probing packets, each including a different one of the range of possible VLAN IDs within the packet header. The probing packet requests a response from the switch indicating whether the corresponding VLAN (identified by the VLAN ID) is supported by the switch. The switch automatically drops any packets with a VLAN ID not recognized/supported/configured in the switch. The destination device only receives supported packets, and thus the interface only receives a response for those request packets having a VLAN ID associated with a supported VLAN. The host's interface then knows which VLAN ID(s) are supported, and the host assigns/utilizes only those VLAN IDs for outgoing traffic.

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Allemang, et al., Local Area Network Switch Frame Lookup Technique for Increased Speed and Flexibility, IBM Technical Disclosure Bulletin, Jul. 1995, pp. 221-222.
IEEE 802.1Q Tag-based VLAN, Jun. 17, 2005, <http://www.zyxel.com/support/supportnote/ves1012/app/8021q.htm>.

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