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Network liveliness detection using session-external communications

  • US 9,407,526 B1
  • Filed: 02/09/2015
  • Issued: 08/02/2016
  • Est. Priority Date: 12/31/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • generating, by an application executing on a routing engine that executes at least one routing protocol to control operation of a router, a packet, wherein the packet is a non-bidirectional forwarding detection (BFD) packet that does not encapsulate a BFD packet;

    receiving, by a packet forwarding engine of the router from the routing engine, the packet;

    forwarding, by the packet forwarding engine via a network interface coupled to the packet forwarding engine, the packet; and

    refreshing, by the packet forwarding engine in response to determining the packet is destined for a peer network device with which the router has a BFD session and without sending a BFD packet, a transmit timer for the BFD session that defines a transmission interval for sending BFD packets from the router to the peer network device.

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