Dynamic instantiation of remote virtual extensible local area network tunnel end points acquired through a control protocol

Patent metadata

Field	Value
Publication number	US-9503277-B2
Application number	US-201414340079-A
Country	US
Kind code	B2
Filing date	Jul 24, 2014
Priority date	Jul 24, 2014
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A method is provided in one example embodiment and includes acquiring at a local network element information regarding a remote network element via a control protocol distribution method and refraining from instantiating the remote VTEP for the remote network element on the local network element until unicast traffic from the local network element to the remote network element via an overlay network has begun. The method may further include detecting unicast traffic from the local network element to the remote network element and subsequent to the detecting, instantiating the remote VTEP for the remote network element on the local network element. Some embodiments may include detecting cessation of the unicast traffic from the local network element to the remote network element and subsequent to the detecting cessation, uninstantiating the remote VTEP for the remote network element from the local network element.

First claim

What is claimed is:

1. A method, comprising:
acquiring at a local network element information regarding a remote network element via a control protocol distribution method;
refraining from instantiating a remote Virtual eXtensible Local Area Network Tunnel End Point (“VTEP”) for the remote network element on the local network element until unicast traffic from the local network element to the remote network element via an overlay network has begun;
detecting unicast traffic from the local network element to the remote network element;
subsequent to the detecting, instantiating the remote VTEP for the remote network element on the local network element
installing on the local network element a host route tied to the remote network element;
detecting whether the remote VTEP for the remote network element is instantiated on the local network element;
instantiating the remote VTEP for the remote network element on the local network element if instantiation of the remote VTEP for the remote network element on the local network element is not detected;
uninstantiating the remote VTEP for the remote network element from the local network element upon detection that all host routes to the remote network element are aged out on the local network element.

2. The method of claim 1 , wherein the detecting comprises:
punting a first packet of the unicast traffic from the local network element to the remote network element to a central processing unit (“CPU”) associated with the local network element, wherein the punting triggers the instantiating.

3. The method of claim 1 , further comprising:
detecting cessation of the unicast traffic from the local network element to the remote network element; and
subsequent to the detecting cessation, uninstantiating the remote VTEP for the remote network element from the local network element.

4. The method of claim 1 , wherein the installing is performed using conversational learning.

5. The method of claim 1 , wherein the local network element and the remote network element each comprises a Virtual eXtensible Local Area Network Tunnel End Point (“VTEP”).

6. The method of claim 1 wherein the protocol comprises Border Gateway Protocol (“BGP”).

7. The method of claim 1 wherein the overlay network is implemented using Virtual eXtensible Local Area Network (“VXLAN”) technology.

8. Non-transitory tangible media that includes code for execution and when executed by a processor is operable to perform operations comprising:
acquiring at a local network element information regarding a remote network element via a control protocol distribution method;
refraining from instantiating a remote Virtual eXtensible Local Area Network Tunnel End Point (“VTEP”) for the remote network element on the local network element until unicast traffic from the local network element to the remote network element via an overlay network has begun;
detecting unicast traffic from the local network element to the remote network element; and
subsequent to the detecting, instantiating the remote VTEP for the remote network element on the local network element;
installing on the local network element a host route tied to the remote network element;
detecting whether the remote VTEP for the remote network element is instantiated on the local network element;
instantiating the remote VTEP for the remote network element on the local network element if instantiation of the remote VTEP for the remote network element on the local network element is not detected;
uninstantiating the remote VTEP for the remote network element from the local network element upon detection that all host routes to the remote network element are aged out on the local network element.

9. The media of claim 8 , wherein the detecting comprises:
punting a first packet of the unicast traffic from the local network element to the remote network element to a central processing unit (“CPU”) associated with the local network element, wherein the punting triggers the instantiating.

10. The media of claim 8 , wherein the operations further comprise:
detecting cessation of the unicast traffic from the local network element to the remote network element; and
subsequent to the detecting cessation, uninstantiating the remote VTEP for the remote network element from the local network element.

11. The media of claim 8 , wherein the local network element and the remote network element each comprises a Virtual eXtensible Local Area Network Tunnel End Point (“VTEP”).

12. An apparatus, comprising:
a memory element configured to store data; and
a processor coupled to said memory element and operable to execute instructions associated with the data;
wherein said processor is configured to:
acquire information regarding a remote network element via a control protocol distribution method;
refrain from instantiating a remote Virtual eXtensible Local Area Network Tunnel End Point (“VTEP”) for the remote network element on a local network element until unicast traffic from the local network element to the remote network element via an overlay network has begun;
detect unicast traffic from the local network element to the remote network element;
subsequent to the detecting, instantiating the remote VTEP for the remote network element on the local network element;
install on the local network element a host route tied to the remote network element;
detect whether the remote VTEP for the remote network element is instantiated on the local network element;
instantiate the remote VTEP for the remote network element on the local network element if instantiation of the remote VTEP for the remote network element on the local network element is not detected;
uninstantiate the remote VTEP for the remote network element from the local network element upon detection that all host routes to the remote network element are aged out on the local network element.

13. The apparatus of claim 12 , wherein the detecting comprises:
punting a first packet of the unicast traffic from the local network element to the remote network element to a central processing unit (“CPU”) associated with the local network element, wherein the punting triggers the instantiating.

14. The apparatus of claim 12 , wherein the processor is further configured to:
detect cessation of the unicast traffic from the local network element to the remote network element; and
subsequent to the detecting cessation, uninstantiate the remote VTEP for the remote network element from the local network element.

15. The apparatus of claim 12 , wherein the local network element and the remote network element each comprise a Virtual eXtensible Local Area Network Tunnel End Point (“VTEP”) and the protocol comprises Border Gateway Protocol (“BGP”).

Assignees

• Cisco Tech Inc

Inventors

• Dong Liqin
• Yang Yibin
• Jin Di
• Zhou Xinggang
• Leung Siu-Man

Classifications

• H04L2012/4629

  using multilayer switching, e.g. layer 3 switching · CPC title

• H04L45/08

  Learning-based routing, e.g. using neural networks or artificial intelligence · CPC title

• H04L12/4633 Primary

  Interconnection of networks using encapsulation techniques, e.g. tunneling · CPC title

• H04L12/4641 Primary

  Virtual LANs, VLANs, e.g. virtual private networks [VPN] (LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272) · CPC title

• H04L45/021

  Ensuring consistency of routing table updates, e.g. by using epoch numbers · CPC title