CA2562013A1 - Distributed forwarding in virtual network devices - Google Patents

Distributed forwarding in virtual network devices Download PDF

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Publication number
CA2562013A1
CA2562013A1 CA002562013A CA2562013A CA2562013A1 CA 2562013 A1 CA2562013 A1 CA 2562013A1 CA 002562013 A CA002562013 A CA 002562013A CA 2562013 A CA2562013 A CA 2562013A CA 2562013 A1 CA2562013 A1 CA 2562013A1
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CA
Canada
Prior art keywords
packet
virtual network
network device
destination address
interface
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Granted
Application number
CA002562013A
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French (fr)
Other versions
CA2562013C (en
Inventor
Sitaram Dontu
Faisal Mushtaq
Sheeram Bhide
Michael R. Smith
Ali Golshan
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Cisco Technology Inc
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Individual
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Publication of CA2562013A1 publication Critical patent/CA2562013A1/en
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Publication of CA2562013C publication Critical patent/CA2562013C/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/18—Loop-free operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/58—Association of routers
    • H04L45/586—Association of routers of virtual routers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H04L45/742—Route cache; Operation thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0806—Configuration setting for initial configuration or provisioning, e.g. plug-and-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0813—Configuration setting characterised by the conditions triggering a change of settings
    • H04L41/082—Configuration setting characterised by the conditions triggering a change of settings the condition being updates or upgrades of network functionality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/12—Discovery or management of network topologies
    • H04L41/122—Discovery or management of network topologies of virtualised topologies, e.g. software-defined networks [SDN] or network function virtualisation [NFV]

Abstract

A virtual network device sub-unit (122(1), 122(2)) includes an interface (320(1), 320(2), 320(3), 320(4)) to a virtual network device link (360) and a distributed forwarding module (312(1), 312(2)). The interface (320(1), 320(2), 320(3), 320(4)) receives a packet, and the distributed forwarding module (312(1), 312(2))forwards the packet received by the interface (320(1), 320(2), 320(3), 320(4)). The distributed forwarding module (312(1), 312(2)) performs an ingress lookup if the packet includes a multicast destination address and an egress lookup if the packet includes a unicast destination address. If the packet includes a multicast destination address, the distributed forwarding module replicates the packet for each of several outgoing VLANs associated with the multicast destination address. If an additional multicast packet is received via an interface (320(1), 320(2), 320(3), 320(4)) that is not coupled to a virtual network device link (306), the distributed forwarding module (312(1), 312(2)) sends at most one copy of the additional multicast packet via the virtual network device link (360).

Claims (28)

WHAT IS CLAIMED IS:
1. A method, comprising:
receiving a packet via a virtual network device link, the packet comprising a unicast destination address; and performing an egress lookup for the packet in response to the receiving the packet.
2. The method of claim 1, wherein a header associated with the packet is also received via the virtual network device link; and the header comprises a destination identifier.
3. The method of claim 2, further comprising:
sending the packet and the header to another line card if a non-primary entry corresponding to the unicast destination address is found during the egress lookup.
The method of claim 2, further comprising:
if a primary entry corresponding to the unicast destination address is found during the egress lookup:
sending the packet from an interface identified by the primary entry.
5. The method of claim 4, further comprising:
sending a notification via the virtual network device link if the destination identifier comprised in the header does not match a destination identifier comprised in the primary entry, wherein the notification identifies the unicast destination address as corresponding to the destination identifier comprised in the primary entry.
6. The method of claim 5, wherein the packet is only sent from the interface if the interface is not comprised in an uplink interface bundle.
7. The method of claim 1, further comprising:
receiving a second packet, the second packet comprising a multicast destination address; and sending at most one copy of the second packet to a virtual network device sub-unit via a virtual network device link, the virtual network device sub-unit comprised in a virtual network device.
8. The method of claim 7, further comprising:
receiving a third packet via the virtual network device link, the third packet comprising a second multicast destination address; and replicating the third packet for each of a plurality of outgoing VLANs (Virtual Local Area Networks) associated with the second multicast destination address.
9. A method comprising:
receiving a packet via a virtual network device link;
performing one of an ingress lookup and an egress lookup for the packet, wherein the ingress lookup is performed for the packet if the packet includes a multicast destination address; and the egress lookup is performed for the packet if the packet includes a unicast destination address.
10. A system comprising:
an interface to a virtual network device link, wherein the interface is configured to receive a packet; and a distributed forwarding module coupled to the interface, wherein the distributed forwarding module is configured to forward the packet, and the distributed forwarding module is configured to perform an egress lookup for the packet if the packet includes a unicast destination address
11. The system of claim 10, wherein the distributed forwarding module is configured to perform an ingress lookup for the packet if the packet includes a multicast destination address.
12. The system of claim 11, further comprising:
a second interface configured to receive a second packet, wherein the second packet comprises a second multicast address, and the distributed forwarding module is configured to send at most one copy of the second packet via the virtual network device link.
13. The system of claim 10, wherein a header associated with the packet is also received via the virtual network device link, the header comprises a destination identifier, and the packet comprises the unicast destination address, and the distributed forwarding module is configured to send the packet and the header to another line card if a non-primary entry corresponding to the unicast destination address is found during the egress lookup.
14. The system of claim 13, wherein the distributed forwarding module is configured to send a notification via the virtual network device link if a destination identifier comprised in the header does not match a destination identifier comprised in the primary entry, and the notification identifies the unicast destination address as corresponding to the destination identifier comprised in the primary entry.
15. A system comprising:

means for receiving a packet via a virtual network device link, the packet comprising a unicast destination address; and means for performing an egress lookup for the packet.
16. The system of claim 15, wherein a header associated with the packet is also received via the virtual network device link, the header comprises a destination identifier obtained by performing an ingress lookup for the packet.
17. The system of claim 16, further comprising:
means for sending the packet and the header to another line card if a non-primary entry corresponding to the unicast destination address is found during the egress lookup.
18. The system of claim 16, further comprising:
means for sending the packet from an interface identified by a primary entry, if the primary entry corresponding to the unicast destination address is found during the egress lookup.
19. The system of claim 18, further comprising:
means for sending a notification via the virtual network device link if the destination identifier comprised in the header does not match a destination identifier comprised in the primary entry, wherein the notification identifies the unicast destination address as corresponding to the destination identifier comprised in the primary entry.
20. The system of claim 18, wherein the packet is only sent from the interface if the interface is not comprised in an uplink interface bundle.
21. The system of claim 16, further comprising:

means for receiving a second packet, the second packet comprising a multicast destination address; and means for sending at most one copy of the second packet to a virtual network device sub-unit via a virtual network device link, the virtual network device sub-unit comprised in a virtual network device.
22. A computer readable medium comprising program instructions executable to:
detect reception of a packet via a virtual network device link, the packet comprising a unicast destination address; and perform an egress lookup for the packet.
23. The computer readable medium of claim 22, wherein a header associated with the packet is also received via the virtual network device link, the header comprises a destination identifier.
24. The computer readable medium of claim 23, wherein the program instructions are further executable to:
send the packet and the header to another line card if a non-primary entry corresponding to the unicast destination address is found during the egress lookup.
25. The computer readable medium of claim 23, wherein the program instructions are further executable to:
send the packet from an interface identified by a primary entry, if the primary entry corresponding to the unicast destination address is found during the egress lookup.
26. The computer readable medium of claim 25, wherein the program instructions are further executable to:
send a notification via the virtual network device link if the destination identifier comprised in the header does not match a destination identifier comprised in the primary entry, wherein the notification identifies the unicast destination address as corresponding to the destination identifier comprised in the primary entry.
27. The computer readable medium of claim 25, wherein the packet is only sent from the interface if the interface is not comprised in an uplink interface bundle.
28. The computer readable medium of claim 23, wherein the program instructions are further executable to:

detect reception of a second packet, the second packet comprising a multicast destination address; and send at most one copy of the second packet to a virtual network device sub-unit via a virtual network device link, the virtual network device sub-unit comprised in a virtual network device.
CA2562013A 2004-04-16 2005-04-05 Distributed forwarding in virtual network devices Active CA2562013C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/826,888 US7839843B2 (en) 2003-09-18 2004-04-16 Distributed forwarding in virtual network devices
US10/826,888 2004-04-16
PCT/US2005/011588 WO2005107188A1 (en) 2004-04-16 2005-04-05 Distributed forwarding in virtual network devices

Publications (2)

Publication Number Publication Date
CA2562013A1 true CA2562013A1 (en) 2005-11-10
CA2562013C CA2562013C (en) 2013-01-15

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Country Status (6)

Country Link
US (1) US7839843B2 (en)
EP (1) EP1757037B1 (en)
CN (1) CN1939004B (en)
AU (1) AU2005239568B2 (en)
CA (1) CA2562013C (en)
WO (1) WO2005107188A1 (en)

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US20050163115A1 (en) 2005-07-28
US7839843B2 (en) 2010-11-23

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