文档介绍：Ring Protection Overview March, 2008 ITU-T Q9 – SG 15
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Agenda
mendation Introduction
Objectives and Principles
Concepts
Protection Switching
R-APS Messages
Items Under Study
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ITU-T SG15/Q9 mendation
mendation consented February 2008
This mendation defines the APS protocol and protection switching mechanisms for ETH layer ring topologies. Included are details pertaining to bridged ring protection characteristics, architectures and the ring APS protocol.
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Proposals and Contributions
Converged Proposals
ERP Work Item Approved in ITU-T
Objective, Principles, and Requirements Setting
mendation Consent
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Objectives and Principles
Use of standard 802 MAC and OAM frames around the ring. Uses standard (and amended Q bridges), but with xSTP disabled.
Ring nodes supports standard FDB MAC learning, forwarding, flush behaviour and port blocking/unblocking mechanisms.
Prevents loops within the ring by blocking one of the links (either a pre-determined link or a failed link).
Monitoring of the ETH layer for discovery and identification of Signal Failure (SF) conditions.
Protection and recovery switching within 50 ms for typical rings.
munication for the protection mechanism should consume a very small percentage of total available bandwidth.
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Terms and Concepts
Ring Protection Link (RPL) – Link designated by mechanism that is blocked during Idle state to prevent loop on Bridged ring
RPL Owner – Node connected to RPL that blocks traffic on RPL during Idle state and unblocks during Protect