Retention of a sub-network connection home path

摘要

Embodiments of the present invention provide a method and system for reserving a connection's home path resources and restoring the connection on a link that includes a reserved priority bandwidth. A bandwidth advertisement indicating that the reserved priority bandwidth is available is analyzed and a restoration request requesting to route the connection on the link is sent. The reserved priority bandwidth is used to route the connection when the connection has a reserved home path on the link. When the connection has a reserved home path not on the link, a determination is made as to whether a normal priority bandwidth on the link is available and whether the connection is unrestorable on another link. The reserved priority bandwidth is used to temporarily route the connection when normal priority bandwidth on the link is unavailable and the connection is unrestorable on another link.

主权项

1. A method for restoring a connection from a protection path after a path failure, the method comprising:
establishing a home path for a connection, the home path having a first normal priority bandwidth assigned to the connection and a first reserved priority bandwidth assigned to the connection; routing the connection to a protection path in response to a failure of the home path, the protection path being different than the home path; detecting correction of the failure of the home path; sending a restoration request requesting to route the connection on the home path in response to the detected correction of the failure of the home path; and when the home path has a second connection using the first normal priority bandwidth after the restoration request is sent:
using the first reserved priority bandwidth to route the connection; and when the home path has the second connection using the first normal priority bandwidth and a third connection using the first reserved priority bandwidth after the restoration request is sent:
determining whether the connection is unrestorable on an alternative normal priority bandwidth of a plurality of alternative home paths; andusing an alternative reserved priority bandwidth of one of the plurality of alternative home paths to temporarily route the connection.