Service plane triggered fast reroute protection

摘要

Techniques are described for detecting failure or degradation of a service enabling technology function independent from an operational state of a service node hosting the service enabling technology function. For example, a service node may provide one or more service enabling technology functions, and service engineered paths may be traffic-engineered through a network to service node network devices that host a service enabling technology function. A monitor component at the service layer of the service node can detect failure or degradation of one or more service enabling technology functions provided by the service node. The monitor component reports detection of failure or degradation to a fault detection network protocol in a forwarding plane of the service node. The fault detection network protocol communicates with an ingress router of a service engineered path to trigger fast reroute by the ingress of traffic flows to bypass the affected service enabling technology function.

主权项

1. A method comprising:
by a service node, applying a service to network traffic received at a service plane of the service node via a primary service engineered path, wherein the service node operates as an egress device of the primary service engineered path; detecting, at the service plane of the service node, that a performance level of the service differs from an expected performance level of the service by at least a threshold amount, wherein the performance level of the service is independent of an overall operational state of the service node; outputting a notification from the service plane to a fault detection network protocol in a forwarding plane of the service node in response to determining that the detected performance level of the service differs from the expected performance level by at least the threshold amount; and in response to receiving notification from the service plane, outputting, by the fault detection network protocol, a control message to a router on the primary service engineered path, wherein the control message notifies the router to reroute network traffic to a second instance of the service provided at a second service node reachable by a backup service engineered path.