Method for ensuring VLAN integrity for voice over internet protocol telephones

• US 7,995,566 B2
• Filed: 05/03/2007
• Issued: 08/09/2011
• Est. Priority Date: 04/19/2001
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: McCloghrie, Keith, Habib, Ahsan, Testa, Stefano, Finn, Norman W.
• Primary Examiner(s): ABELSON, RONALD B
• Application Number:
  US11/744,103
• Publication Number:
  US 20070201667A1
• Time in Patent Office: 1,559 Days
• Field of Search: 370/352, 370/354, 370/389, 370/392, 370/396
• US Class Current: 370/354
• CPC Class Codes: H04L 12/4645 Details on frame tagging routing of packets H04L45/00; support for virtual LAN H04L49/354
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 47/2441 relying on flow classification, e.g. using integrated services [IntServ]
• CPC Class Codes: H04L 47/2483 involving identification of individual flows
• CPC Class Codes: H04L 47/31 by tagging of packets, e.g. using discard eligibility [DE] bits
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/80 Responding to QoS

Abstract

A system and method for implementing telephony devices in a distributed network environment is disclosed. The present invention provides for checking data packets to ensure that non-voice data packets are properly tagged to be transmitted on a native virtual local area network (“VLAN”). Voice data packets transmitted on a separate VLAN with a higher priority.

Claims

1. A system for ensuring data packet tag integrity, the system comprising:

a network switch; and

at least one telephony device coupled to the network switch, the at least one telephony device operable to;

receive a message from the network switch to check contents of incoming data packets;

check the contents of the incoming data packets; and

re-mark virtual local area network information of the incoming data packets with one of a plurality of virtual local area network tags based on the contents of the incoming data packets in response to the message received from the network switch.

2. The system of claim 1, wherein the at least one telephony device comprises a multiple port switch.

3. The system of claim 1, wherein the at least one telephony device comprises an access port, the access port operable to transmit and receive data from an external network device coupled to the access port.

4. The system of claim 3, wherein the external network device comprises one of a general purpose computer or a computer server.

5. The system of claim 1, wherein the at least one telephony device comprises an access port, the access port operable to transmit and receive data from a second telephony device coupled to the access port.

6. The system of claim 1, wherein the at least one telephony device comprises a network port, the network port operable to transmit and receive data from the network switch.

7. The system of claim 1, wherein the at least one telephony device comprises an internal telephone port, the internal telephone port operable to transmit and receive data from a telephone circuit internal to the at least one telephony device.

8. The system of claim 1, wherein one of a plurality of virtual local area networks is a native virtual local area network, and a second virtual local area network is a voice virtual local area network communicating voice data packets.

9. A system for ensuring data packet tag integrity, the system comprising:

a network switch; and

a first telephony device coupled to the network switch, the first telephony device operable to;

receive a message from the network switch to check contents of incoming data packets;

check the contents of the incoming data packets; and

re-mark virtual local area network information of the incoming data packets with one of a plurality of virtual local area network tags based on the contents of the incoming data packets in response to the message received from the network switch.

10. A system for ensuring data packet tag integrity, the system comprising:

means for switching data packets; and

telephony means for transmitting and receiving voice and non-voice communications, the telephony means coupled to the means for switching, the telephony means operable to;

receive a message from the means for switching to check contents of incoming data packets;

check the contents of the incoming data packets; and

re-mark virtual local area network information of the incoming data packets with one of a plurality of virtual local area network tags based on the contents of the incoming data packets in response to the message received from the means for switching.

11. A method for ensuring data packet tag integrity, the method comprising:

receiving a message at a first telephony device that switches the first telephony device between first and second modes of operation;

checking contents of incoming data packets if in the first mode of operation; and

re-marking the incoming data packets virtual local area network information with a tag for one of a plurality of virtual local area networks according to the contents of the incoming data packets if in the first mode of operation.

12. The method of claim 11, wherein checking contents of the incoming data packets comprises determining whether the incoming data packets are voice packets or non-voice packets.

13. The method of claim 11, wherein checking contents of the incoming data packets comprises:

determining whether the incoming data packets are voice packets or non-voice packets; and

determining whether the virtual local area network information corresponds to the contents of the incoming data packets.