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MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection draft-ceccarelli-mpls-tp-p2mp-ring Yaacov Weingarten ) Stewart.

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Presentation on theme: "MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection draft-ceccarelli-mpls-tp-p2mp-ring Yaacov Weingarten ) Stewart."— Presentation transcript:

1 MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection draft-ceccarelli-mpls-tp-p2mp-ring Yaacov Weingarten (yaacov.weingarten@nsn.com ) Stewart Bryant (stbryant@cisco.com), Nurit Sprecher (nurit.sprecher@nsn.com), Daniele Ceccarelli (daniele.ceccarelli@ericsson.com) Diego Caviglia (diego.caviglia@ericsson.com)

2 MPLS-TP Criteria for dedicated ring protection MPLS-TP Requirements identifies five criteria for defining a special protection mechanism for a specific topology Minimize the number of OAM entities needed to trigger the protection Minimize the number of recovery objects needed Minimize number of labels required Minimize number of control and management plane transactions during a recovery operation In presence of control plane, minimize impact of signaling and routing information exchanged Note – no requirement has been identified to be specific to a ring topology

3 Status of the drafts Have agreed to merge the current drafts into a single applicability document Define the problem statement – Need to address p2p and p2mp LSPs that cross a MPLS-TP ring Need to address both link failure and node failure in the ring Show how we can present solutions that are dependent upon existing mechanisms without the need to add any new mechanisms The proposed solutions that fulfill the requirements and achieve the behavior of the criteria defined in the TP requirements

4 P2P solution - Steering Trigger switching Run OAM sessions on PST and alternate PST from each node to each other node (O(2n) sessions per node) Use AIS functionality to notify ingress MEP Ingress node transmits protected traffic on working or recovery PST Identical to 1:1 linear protection, turning the ring into a lower layer protected span CBA DEF Working segment (PST) Recovery segment (PST)

5 P2MP – Option 1 – 1+1 protection Replicate data on both the working and recovery PST Each node needs to forward packet and examine local copy of stack to identify packets to egress Each egress decides on basis of strength of signal which data to use No need for coordination between the egress and ingress CBA EFG Working PST Recovery PST D H Cont Recovery PST

6 P2MP – Option 2 – ROM FRR Optimize wrapping of p2mp by configuring alternate paths for each protected element N alternate paths configured for each LSP Support local switching that is wrapped until farthest egress Appropriate for specific applications (e.g. Video distribution in metro rings) OMS 2400 A B C D E F DSLAM2 DSLAM3 p2mp working LSP (cw) p2mp protection LSP (ccw)

7 Conclusions and Next Steps Develop applicability draft to propose solutions based on existing MPLS survivability technologies that Optimize: The numbers of OAM Sessions, Number of alternate labels The bandwidth usage Work within the labeling mechanism of MPLS-TP There are still additional (4-5) ring protection drafts – need to unify these with the proposal some of these are very similar Invite all authors to: Spend the time to read our ID and check if they are fine with it join forces and produce single draft Final draft to WG draft


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