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Application aware inter-chassis redundancy

  • US 10,210,058 B1
  • Filed: 09/30/2015
  • Issued: 02/19/2019
  • Est. Priority Date: 03/31/2015
  • Status: Active Grant
First Claim
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1. A service delivery gateway comprising:

  • a forwarding component that directs received packet flows to service chains, each of the service chains being a different ordered combination of one or more services in a plurality of services, wherein performance levels of the services are independent of an overall operational state of the service delivery gateway;

    a user interface configured to receive configuration information conforming to a syntax, the configuration information defining;

    one or more redundancy events that include critical events defined as failures or degradations in specific services in the plurality of services;

    a plurality of redundancy policies, wherein each respective redundancy policy of the plurality of redundancy policies specifies one or more of the redundancy events and one or more actions to take in response to an occurrence of the one or more redundancy events specified by the respective redundancy policy;

    a plurality of redundancy sets, the plurality of redundancy sets including a first redundancy set, wherein for each respective redundancy set of the plurality of redundancy sets;

    the configuration information defining the respective redundancy set specifies that the respective redundancy set corresponds to a group of one or more of the redundancy policies,the service delivery gateway is configured to operate in either a master redundancy state for the respective redundancy set or a standby redundancy state for the respective redundancy set; and

    a routing component configured to, in response to detecting occurrence of a particular redundancy event of the defined redundancy events specified by a particular redundancy policy of one of the one or more redundancy policies corresponding to the first redundancy set, trigger a transition from the service delivery gateway being in the master redundancy state for the first redundancy set to the service delivery gateway being in the standby redundancy state for the first redundancy set, wherein the routing component is configured such that, as part of triggering the transition, the routing component;

    in response to detecting the particular redundancy event, adds a signal-route to a Routing Information Base (RIB); and

    advertises the signal-route to routing protocol peer network devices, wherein the signal-route causes the routing protocol peer network devices to route traffic requiring services of one or more of the service chains to a second, different service delivery gateway.

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