ITUTG8032-ERPS协议介绍.ppt
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1、G.8032Ethernet Ring Protection OverviewMarch,2008ITU-T Q9 SG 15AgendaG.8032 Recommendation IntroductionG.8032 Objectives and PrinciplesG.8032 ConceptsG.8032 Protection SwitchingG.8032 R-APS MessagesG.8032 Items Under Study2ITU-T SG15/Q9 G.8032 RecommendationG.8032 Recommendation consented February 2
2、008This Recommendation 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.JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDE
3、CJANFEBMAR200620072008G.8032 Proposals G.8032 Proposals and Contributionsand ContributionsG.8032 Converged ProposalsG.8032 Converged ProposalsG.8032 ERP Work G.8032 ERP Work Item Approved in Item Approved in ITU-TITU-TG.8032 Objective,G.8032 Objective,Principles,and Principles,and Requirements Setti
4、ngRequirements SettingG.8032 Recommendation G.8032 Recommendation ConsentConsent3G.8032 Objectives and PrinciplesUse of standard 802 MAC and OAM frames around the ring.Uses standard 802.1Q(and amended Q bridges),but with xSTP disabled.Ring nodes supports standard FDB MAC learning,forwarding,flush be
5、haviour 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 t
6、ypical rings.Total communication for the protection mechanism should consume a very small percentage of total available bandwidth.4G.8032 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 connecte
7、d to RPL that blocks traffic on RPL during Idle state and unblocks during Protected state Link Monitoring Links of ring are monitored using standard ETH CC OAM messages(CFM)Signal Fail(SF)Signal Fail is declared when ETH trail signal fail condition is detected No Request(NR)No Request is declared wh
8、en there are no outstanding conditions(e.g.,SF,etc.)on the node Ring APS(R-APS)Messages Protocol messages defined in Y.1731 and G.8032 Automatic Protection Switching(APS)Channel-Ring-wide VLAN used exclusively for transmission of OAM messages including R-APS messages5G.8032 Timers G.8032 specifies t
9、he use of different timers to avoid race conditions and unnecessary switching operationsWTR(Wait to Restore)Timer Used by the RPL Owner to verify that the ring has stabilized before blocking the RPL after SF RecoveryHold-off Timers Used by underlying ETH layer to filter out intermittent link faultsF
10、aults will only be reported to the ring protection mechanism if this timer expires6Controlling the Protection Mechanism Protection switching triggered by Detection/clearing of Signal Failure(SF)by ETH CC OAMRemote requests over R-APS channel(Y.1731)Expiration of G.8032 timers R-APS requests control
11、the communication and states of the ring nodesTwo basic R-APS messages specified -R-APS(SF)and R-APS(NR)RPL Owner may modify the R-APS(NR)indicating the RPL is blocked:R-APS(NR,RB)Ring nodes may be in one of two statesIdle normal operation,no link/node faults detected in ringProtecting Protection sw
12、itching in effect after identifying a signal fault7A.Physical topology has all nodes connected in a ringB.ERP guarantees lack of loop by blocking the RPL(link between 6&1 in figure)C.Logical topology has all nodes connected without a loop.D.Each link is monitored by its two adjacent nodes using ETH
13、CC OAM messagesE.Signal Failure as defined in Y.1731,is trigger to ring protectionLoss of ContinuityServer layer failure(e.g.Phy Link Down)RPL OwnerRPLETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCETH-CCPhysicaltopologyLogicaltopology126435RPL126435Ring Idle State8Protection Swit
14、ching Link FailureA.Link/node failure is detected by the nodes adjacent to the failure.B.The nodes adjacent to the failure,block the failed link and report this failure to the ring using R-APS(SF)messageC.R-APS(SF)message triggersRPL Owner unblocks the RPLAll nodes perform FDB flushingD.Ring is in p
15、rotection stateE.All nodes remain connected in the logical topology.PhysicaltopologyLogicaltopology126435RPL126435RPL126435126435RPL OwnerRPLR-APS(SF)R-APS(SF)R-APS(SF)R-APS(SF)9Protection Switching Failure RecoveryA.When the failed link recovers,the traffic is kept blocked on the nodes adjacent to
16、the recovered linkB.The nodes adjacent to the recovered link transmit R-APS(NR)message indicating they have no local request present C.When the RPL Owner receives R-APS(NR)message it Starts WTR timerD.Once WTR timer expires,RPL Owner blocks RPL and transmits R-APS(NR,RB)messageE.Nodes receiving the
17、message perform a FDB Flush and unblock their previously blocked portsF.Ring is now returned to Idle stateRPL OwnerRPLR-APS(NR)R-APS(NR)R-APS(NR)R-APS(NR)R-APS(NR,RB)R-APS(NR,RB)PhysicaltopologyLogicaltopology126435RPL126435126435RPL12643510Signaling Channel Information ERP uses R-APS messages to ma
18、nage and coordinate the protection switching R-APS defined in Y.1731-OAM common fields are defined in Y.1731.Version 00000 for this version of RecommendationOpCode defined to be 40 in Y.1731Flags 00000000 should be ignored by ERP1234876543218765432187654321876543211MELVersion(0)OpCode(R-APS=40)Flags
19、(0)TLV Offset(32)5R-APSSpecificInformation(32octets).37optional TLV starts here;otherwise End TLVlastEndTLV(0)Defined by Y.1731Defined by G.8032Non-specified content11R-APS Specific Information Specific information(32octets)defined by G.8032Request/Status(4bits)1011=SF|0000=NR|Other=FutureStatus RB(
20、1bit)Set when RPL is blocked(used by RPL Owner in NR)Status DNF(1bit)Set when FDB Flush is not necessary(Future)NodeID(6octets)MAC address of message source node(Informational)Reserved1(4bits),Status Reserved(6bits),Reserved2(24octets)-Future development123487654321876543218765432187654321Request/St
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- ITUTG8032 ERPS 协议 介绍
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