Pseudowire Preferential Forwarding Status Bit
RFC 6870, “Pseudowire Preferential Forwarding Status Bit”, is a Proposed Standard document published in February 2013 by P. Muley, M. Aissaoui. It updates RFC 4447. It has since been updated by RFC 7771. The canonical text is published by the RFC Editor.
Abstract
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.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 6870 is hosted at rfc-editor.org. Available in TXT,HTML.
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