CA2534510C - Virtual network device - Google Patents

Virtual network device Download PDF

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Publication number
CA2534510C
CA2534510C CA2534510A CA2534510A CA2534510C CA 2534510 C CA2534510 C CA 2534510C CA 2534510 A CA2534510 A CA 2534510A CA 2534510 A CA2534510 A CA 2534510A CA 2534510 C CA2534510 C CA 2534510C
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Prior art keywords
chassis
virtual switch
master
switch
slave
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CA2534510A
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French (fr)
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CA2534510A1 (en
Inventor
Michael Smith
Ali Golshan
Jeffrey Ym Wang
Neelima Mehta
Venkatesh Janakiraman
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Cisco Technology Inc
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Cisco Technology Inc
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Publication of CA2534510A1 publication Critical patent/CA2534510A1/en
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/58Association of routers
    • H04L45/586Association of routers of virtual routers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00Packet switching elements
    • H04L49/70Virtual switches
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08Configuration management of networks or network elements
    • H04L41/0803Configuration setting
    • H04L41/0806Configuration setting for initial configuration or provisioning, e.g. plug-and-play
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08Configuration management of networks or network elements
    • H04L41/0803Configuration setting
    • H04L41/0813Configuration setting characterised by the conditions triggering a change of settings
    • H04L41/082Configuration setting characterised by the conditions triggering a change of settings the condition being updates or upgrades of network functionality
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/40Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities

Abstract

Method and devices are provided to form virtual switches for data networks. As noted above, the term "switch" as used herein will apply to switches, routers and similar network devices. Each virtual switch acts as a single logical unit, while encompassing at least two physical chassis. Accordingly, each virtual switch may be treated as a single point of management. Each virtual switch includes a master chassis and at least one slave chassis. The master chassis is configured to control the slave chassis. The master chassis includes at least one master supervisor card and the slave chassis includes at least one slave supervisor card. The master chassis and the slave chassis communicate via a virtual switch link according to a virtual switch link protocol.

Claims (34)

Claims:
1. A virtual switch for a network, the virtual switch comprising:
a master chassis comprising:
a first plurality of linecards; and a first master supervisor card for controlling the first plurality of linecards; and a slave chassis under the control of the master supervisor card, the slave chassis comprising:
a second plurality of linecards; and a slave supervisor card; and a virtual switch link for communication between the master chassis and the slave chassis, wherein the master chassis and the slave chassis communicate according to a virtual switch link protocol for logically extending a data plane of the master chassis to that of the slave chassis.
2. The virtual switch of claim 1, wherein the virtual switch link comprises a control virtual switch link and a data virtual switch link.
3. The virtual switch of claim 1, wherein the virtual switch link comprises a plurality of physical links combined to form a logical link.
4. The virtual switch of claim 1, wherein a packet header according to the virtual switch link protocol comprises a field indicating whether a packet has traversed the virtual switch link.
5. The virtual switch of claim 1, wherein the virtual switch link is used to synchronize routing tables of the master chassis and the slave chassis.
6. The virtual switch of claim 2, wherein the control virtual switch link extends an internal Out-of-Band Channel to communicate between the master chassis and the slave chassis.
7. The virtual switch of claim 2, wherein the data virtual switch link extends an internal chassis data plane to communication between the master chassis and the slave chassis.
8. The virtual switch of claim 2, wherein the master supervisor communicates with the slave supervisor via inband messaging on the control virtual switch link.
9. The virtual switch of claim 2, wherein the control virtual switch link is brought on-line first and is used to determine which chassis will be the master chassis.
10. The virtual switch of claim 2, wherein a single physical link combines the control virtual switch link and the data virtual switch link.
11. The virtual switch of claim 2, wherein the control virtual switch link and the data virtual switch link are formed from separate physical links.
12. A master chassis configured to control a virtual switch for a network, the master chassis comprising:
a first plurality of linecards; and a master supervisor card for controlling the first plurality of linecards and a slave chassis, the master supervisor card communicating with the slave chassis via a virtual switch link protocol that logically extends a data plane of the master chassis to that of the slave chassis.
13. A method of forming a virtual switch from a plurality of physical switches in a network, the method comprising:
configuring a first physical switch as a master switch for controlling the virtual switch;
configuring a second physical switch as a slave switch under the control of the master switch;
forming a virtual switch link for communication between the master switch and the slave switch;
causing the master switch and the slave switch to communicate via a virtual switch link protocol; and extending a first data plane of the master switch to include a second data plane of the slave switch according to communication between the master switch and the slave switch via the virtual switch link protocol.
14. The method of claim 13, wherein a packet header according to the virtual switch link protocol comprises a source port identifier.
15. The method of claim 13, wherein a packet header according to_the virtual switch link protocol comprises a destination port index.
16. The method of claim 13, wherein a packet header according to the virtual switch link protocol comprises source flood information.
17. The method of claim 13, wherein a packet header according to the virtual switch link protocol comprises VLAN information.
18. The method of claim 13, wherein the virtual switch link protocol is used by the first and second physical switches to indicate whether an access control list should be applied to a frame.
19. The method of claim 13, wherein the virtual switch link protocol is used by the first and second physical switches to indicate whether a QoS designation should be applied to a frame.
20. The method of claim 13, wherein the virtual switch link protocol is used by the first and second physical switches to indicate whether a frame is a MAC notification frame.
21. The method of claim 13, wherein a packet header according to the virtual switch link protocol comprises data plane priority information for a frame.
22. The method of claim 13, further comprising forming the virtual switch link from a plurality of physical links acting as a single logical link.
23. The method of claim 13, further comprising forming the virtual switch link to include a data virtual switch link and a control virtual switch link.
24. The method of claim 13, further comprising:
updating layer 2 forwarding tables in the master chassis;
updating layer 2 forwarding tables in the slave chassis; and correcting inconsistencies between the layer 2 forwarding tables in the master chassis and the layer 2 forwarding tables in the slave chassis.
25. The method of claim 13 wherein the step of forming the virtual switch link comprises combining a data virtual switch link and a control virtual switch link on a single physical link.
26. The method of claim 23, further comprising:

updating layer 2 forwarding tables in the master chassis;
updating layer 2 forwarding tables in the slave chassis; and correcting inconsistencies between the layer 2 forwarding tables in the master chassis and the layer 2 forwarding tables in the slave chassis according to frames transmitted on the data virtual switch link.
27. The method of claim 26, wherein the frames are MAC notification frames.
28. An apparatus for forming a virtual switch from a plurality of physical switches in a distribution layer or a core layer of a network, the apparatus comprising:
means for configuring a first physical switch as a master switch for controlling the virtual switch;
means for configuring a second physical switch as a slave switch under the control of the master switch;
means for forming a virtual switch link for communication between the master switch and the slave switch; and means for causing the master switch and the slave switch to communicate via a virtual switch link protocol that logically extends a first data plane of the master switch to that of the slave switch.
29. A computer readable medium, having stored thereon instructions for controlling a plurality of physical switches of a network, the instructions when executed by a processor cause the processor to perform the following steps:
configuring a first physical switch as a master switch for controlling the virtual switch;
configuring a second physical switch as a slave switch under the control of the master switch;
forming a virtual switch link for communication between the master switch and the slave switch;
causing the master switch and the slave switch to communicate via a virtual switch link protocol; and extending a first data plane of the master switch to include a second data plane of the slave switch according to communication between the master switch and the slave switch via the virtual switch link protocol.
30. A method of initializing a virtual switch, comprising:
performing a handshake sequence between a first chassis and a second chassis via a virtual a virtual switch link between the first chassis and the second chassis, the first chassis and the second chassis being redundant switches of a data network;
and determining whether the first chassis or the second chassis will be a master chassis for controlling a virtual switch comprising the first chassis and the second chassis; and extending a first data plane of the master chassis to include a second data plane of a non-master chassis according to communication between the first chassis and the second chassis via the virtual switch link according to a virtual switch link protocol.
31. The method of claim 30, wherein the handshake sequence includes exchanging information selected from the group consisting of a hardware version of a supervisor; a chassis identifier; a chassis number; a software version of each supervisor in a chassis;
hardware values for a slot in a chassis; and a slot/port of a remote endpoint for a particular link between the first chassis and the second chassis.
32. The method of claim 30, further comprising the step of forming a control virtual switch link of the virtual switch according to information exchanged during the handshake sequence.
33. The method of claim 32, further comprising the step of ascertaining whether a physical link that will become a data virtual switch link is connected to both the first chassis and the second chassis.
34. The method of claim 33, further comprising the step of forming a data virtual switch link of the virtual network device if the ascertaining step indicated that the physical link was connected to both the first chassis and the second chassis.
CA2534510A 2003-09-18 2004-09-08 Virtual network device Active CA2534510C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/666,306 US7751416B2 (en) 2003-09-18 2003-09-18 Virtual network device
US10/666,306 2003-09-18
PCT/US2004/029553 WO2005029784A2 (en) 2003-09-18 2004-09-08 Virtual network device

Publications (2)

Publication Number Publication Date
CA2534510A1 CA2534510A1 (en) 2005-03-31
CA2534510C true CA2534510C (en) 2010-04-13

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US (1) US7751416B2 (en)
EP (1) EP1665652B1 (en)
CN (1) CN100583811C (en)
AT (1) ATE416537T1 (en)
AU (1) AU2004305790B2 (en)
CA (1) CA2534510C (en)
DE (1) DE602004018166D1 (en)
DK (1) DK1665652T3 (en)
WO (1) WO2005029784A2 (en)

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