System and method for reducing traffic loss while using loop free alternate routes for multicast only fast reroute (mofrr)
AssigneeAlcatel-Lucent USA Inc.
InventorsJAYANT KOTALWAR, JAISHAL SHAH
Life of this patent
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Abstract
A system, method and apparatus for adapting operation of a router configured to receive commonly sourced traffic via primary and secondary Upstream Multicast Hop (UMH) links, wherein the secondary path is cached for a predetermined period of time to avoid data loss upon restoration of the primary path.
Claims14
A method for use at a router configured to receive commonly sourced traffic via a first link associated with a primary path Upstream Multicast Hop (UMH) and a second link associated with a secondary path UMH, the method comprising:
- in response to detecting a primary path error, adapting a forwarding plane to forward traffic associated with the secondary path UMH and caching the secondary path UMH as a primary path UMH;
- and
- in response to detecting a primary path restoration, starting a timer and adapting the forwarding plane to continue forwarding traffic associated with the secondary path UMH until the occurrence of the expiry of said timer or the arrival of traffic from the primary path UMH.
A telecom network element configured to receive commonly sourced traffic via a first link associated with a primary path Upstream Multicast Hop (UMH) and a second link associated with a secondary path UMH, the telecom network element comprising a processor configured for:
- in response to detecting a primary path error, adapting a forwarding plane to forward traffic associated with the secondary path UMH and caching the secondary path UMH as a primary path UMH;
- and
- in response to detecting a primary path restoration, starting a timer and adapting the forwarding plane to continue forwarding traffic associated with the secondary path UMH until the occurrence of the expiry of said timer or the arrival of traffic from the primary path UMH.
A tangible and non-transient computer readable storage medium storing instructions which, when executed by a computer, adapt the operation of the computer to provide a method for use at a router configured to receive commonly sourced traffic via a first link associated with a primary path Upstream Multicast Hop (UMH) and a second link associated with a secondary path UMH, the method comprising:
- in response to detecting a primary path error, adapting a forwarding plane to forward traffic associated with the secondary path UMH and caching the secondary path UMH as a primary path UMH;
- and
- in response to detecting a primary path restoration, starting a timer and adapting the forwarding plane to continue forwarding traffic associated with the secondary path UMH until the occurrence of the expiry of said timer or the arrival of traffic from the primary path UMH.
A computer program product wherein computer instructions, when executed by a processor in a telecom network element, adapt the operation of the telecom network element to provide a method for use at a router configured to receive commonly sourced traffic via a first link associated with a primary path Upstream Multicast Hop (UMH) and a second link associated with a secondary path UMH, the method comprising:
- in response to detecting a primary path error, adapting a forwarding plane to forward traffic associated with the secondary path UMH and caching the secondary path UMH as a primary path UMH;
- and
- in response to detecting a primary path restoration, starting a timer and adapting the forwarding plane to continue forwarding traffic associated with the secondary path UMH until the occurrence of the expiry of said timer or the arrival of traffic from the primary path UMH.
Dependencies are inferred from the claim text.