System, method and apparatus for efficient management of S-PMSI resource in RSVP P2MP multicast networks

摘要

A method, apparatus, and machine readable storage medium is for management of an Inclusive Provider Multicast Service Interface (I-PMSI) tunnel for forwarding traffic for a given multicast flow is disclosed. Aspects of the method comprise: upon expiry of an S-PMSI_DELAY interval timer, switching the multicast flow from the I-PMSI tunnel to a Selective Provider Multicast Service Interface (S-PMSI) tunnel only if the number of active Source-to-Leaf (S2L) paths exceeds a defined first threshold of a number of S2L paths and otherwise resetting the S-PMSI_DELAY interval timer. Other aspects provide for switching the multicast flow from the I-PMSI tunnel to the S-PMSI tunnel only if the number of PE nodes associated with the S-PMSI tunnel interested in the multicast flow does not exceed a defined a second threshold. Other aspects, in the case of the S-PMSI tunnel being active, further comprise steps of switching the multicast flow from the S-PMSI tunnel to the I-PMSI tunnel if the number of S2L paths on S-PMSI in bypass exceeds a third defined threshold.

主权项

1. A method performed by a network device for management of an Inclusive Provider Multicast Service Interface (I-PMSI) tunnel configured to forward traffic for a multicast flow, the method comprising:
defining a first threshold of a number of Source-to-Leaf (S2L) paths; receiving an expiry indication of an interval timer; determining a number of active S2L paths within said I-PMSI tunnel; and upon receiving said indication, determining if said number of active S2L paths exceeds said first threshold, wherein the first threshold is greater than one; if said number of active S2L paths exceeds said first threshold, then switching said multicast flow from said I-PMSI tunnel to a Selective Provider Multicast Service Interface (S-PMSI) tunnel; and if said number of active S2L paths does not exceed said first threshold, then resetting said interval timer, wherein said number of active S2L paths and said first threshold represent numbers relative to a total number of S2L paths within said I-PMSI tunnel.