Pseudowire Preferential Forwarding Status Bit, February 2013
- File formats:
- PROPOSED STANDARD
- RFC 4447
- Updated by:
- RFC 7771
- P. Muley, Ed.
M. Aissaoui, Ed.
- pwe3 (rtg)
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This document describes a mechanism for signaling the active and standby status of redundant Pseudowires (PWs) between their termination points. A set of Redundant PWs is configured between Provider Edge (PE) nodes in single-segment pseudowire (SS-PW) applications or between Terminating Provider Edge (T-PE) nodes in Multi-Segment Pseudowire (MS-PW) applications.
In order for the PE/T-PE nodes to indicate the preferred PW to use for forwarding PW packets to one another, a new status bit is defined. This bit indicates a Preferential Forwarding status with a value of active or standby for each PW in a redundant set.
In addition, a second status bit is defined to allow peer PE nodes to coordinate a switchover operation of the PW.
Finally, this document updates RFC 4447 by adding details to the handling of the PW status code bits in the PW Status TLV.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.