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FAST CONVERGENCE IN VXLAN NETWORK USING BIDIRECTIONAL FORWARD DETECTION

IP.com Disclosure Number: IPCOM000241010D
Publication Date: 2015-Mar-18
Document File: 3 page(s) / 53K

Publishing Venue

The IP.com Prior Art Database

Related People

Bo Sun: AUTHOR [+4]

Abstract

Fast convergence is achieved in a Virtual Extensible Local Area Network (VxLAN) network. The configuration of Bidirectional Forward Detection (BFD) on a VxLAN Tunneling Endpoint (VTEP) is simplified. BFD enabled on a VTEP will provide local access status to a remote source VTEP. Also, BFD enable on a VTEP will provide remote VTEP status to local access.

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FAST CONVERGENCE IN VXLAN NETWORK USING BIDIRECTIONAL FORWARD DETECTION

AUTHORS:

 Bo Sun Jeffrey Cai

Peng Wang Yu Jiang

CISCO SYSTEMS, INC.

ABSTRACT

    Fast convergence is achieved in a Virtual Extensible Local Area Network (VxLAN) network. The configuration of Bidirectional Forward Detection (BFD) on a VxLAN Tunneling Endpoint (VTEP) is simplified. BFD enabled on a VTEP will provide local access status to a remote source VTEP. Also, BFD enable on a VTEP will provide remote VTEP status to local access.

DETAILED DESCRIPTION

     Virtual Extensible Local Area Network (VxLAN) is a technology useful to build a Layer 2 (L2) virtualization network. VxLAN can offer the capacity of creating of large number of small logical segments, well beyond the traditional IEEE 802.1Q standard limit, which is 4000.

    Without a control plane, VxLAN uses flooding/learning to build a Media Access Control (MAC) table on VxLAN devices, and each VxLAN Tunneling Endpoint (VTEP) maps to a multicast group for Broadcast, Unknown unicast and Multicast (BUM) traffic. Normally, the aging time of a MAC address needs several minutes (default is 5 minutes). This means that when there is a remote failure, traffic is still sent to this "black hole" for a relatively long time until a MAC table refresh occurs based on new incoming traffic or by an aging timer.

Copyright 2015 Cisco Systems, Inc.

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    A long failover detection time will cause traffic loss even if there is a redundancy gateway device. If a VTEP has a redundancy node, fast switchover to an available redundant VTEP will prevent this undesirable situation.

    There are two challenges. First, when adding a new VTEP into a topology, there is a need to do static Bidirectional Forward Detection (BFD) configuration on all other nodes. Second, BFD enabled in an overlay network interface may NOT be used to indicate a VTEP forwarding state.

    Accordingly, techniques are presented herein to use multicast BFD to implement VTEP auto discovery and automatically setup a BFD session between VTEPs. BFD enabled on a VTEP provides local VTEP forwarding state to a remote VTEP by a multicast BFD message.

    A remote active VTEP l...