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PBB-TE Infrastructure Protection Switching Operation

Joint ITU-T/IEEE Workshop on The Future of Ethernet Transport (Geneva, 28 May 2010). PBB-TE Infrastructure Protection Switching Operation. Bob Sultan, Huawei Technologies. Topics. Review PBB-TE Forwarding The Infrastructure Segment and IPG Monitoring the Segment Provisioning an IPG

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PBB-TE Infrastructure Protection Switching Operation

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  1. Joint ITU-T/IEEE Workshop on The Future of Ethernet Transport(Geneva, 28 May 2010) PBB-TE Infrastructure Protection Switching Operation Bob Sultan, Huawei Technologies

  2. Topics • Review PBB-TE Forwarding • The Infrastructure Segment and IPG • Monitoring the Segment • Provisioning an IPG • Infrastructure Protection Switching

  3. PBB-TE Forwarding (ESP) FDB D Filtering Database (FDB) B <DA, VID> <DA, VID> Port Out Port Out <E, 7> P1 <E, 7> P2 P2 ESP X P2 A B D E P1 P1 C P2 P3 P1 FDB C P3 P3 <DA, VID> Port Out <E, 7> P3 • Ethernet Switched Path (ESP) forwarding is based on provisioned 2-tuple <Destination MAC, VLAN Identifier> and associated outbound local port;

  4. A pair of counterdirectional congruent PtP ESPs form a PtP Traffic Engineered Service Instance (TESI); IPS also applies to linear portions of PtMP TESIs; PBB-TE Forwarding (TESI) FDB D Filtering Database (FDB) B <DA, VID> <DA, VID> Port Out Port Out <E, 7> P1 <E, 7> P2 <A, 8> P2 <A, 8> P1 P2 ESP x P2 A B D E P1 P1 C P2 P3 P1 ESP y FDB C P3 TESI P3 <DA, VID> Port Out <E, 7> P3 <A, 8> P1 4 Geneva, 28 May 2010

  5. A segment is specified by a sequence of ports: Green: B.P2 – C.P1 – C.P3 – D.P2 Red: F.P2 – G.P1 – G.P2 – H.P2 Bridge terminating a segment contains exactly one port associated with that segment; Segment P2 ESP x P2 A B D E P1 P1 C P2 P3 P1 P3 P3 P1 P1 F P2 H P2 G P1 P2 5 Geneva, 28 May 2010

  6. The state of an Infrastructure Segment is monitored by a Maintenance Association (MA) specific to that Segment; Distinct type of MA; not the same as the PBB-TE MA associated with a TESI; Terminates at PBP vs. CBP; Down MEPs vs. Up MEPs; Segment Monitoring CCM CCM CCM CCM CCM CCM Green MEP Green MEP Green Segment MA A B D E C 6 Geneva, 28 May 2010

  7. Non-overlapping segments having the same pair of segment endpoint bridges (SEB) form an IPG; A Bridge maintains a table for each IPG terminating in that Bridge (just one shown in this figure); The table contains a list of 2-tuples representing traffic provisioned to follow one of the Infrastructure Segments which is known as the Working Segment; Infrastructure Protection Group (IPG) I J SEB SEB A B D E C Working Segment IPG IPG <I, 9> <J, 11> F H G <E, 7> <A, 6> 7 Geneva, 28 May 2010

  8. Protection Segment The Protection Segment provides an alternate path for traffic associated with the listed 2-tuples for the IPG; The IPG maintains the local port numbers associated with the Working and Protection Segments respectively; I J SEB SEB P2 P2 A B D E C Working Segment P3 P3 IPG IPG WS: P2 WS: P2 PS: P3 Protection Segment PS: P3 F H G <I, 9> <J, 11> <A, 6> <E, 7> 8 Geneva, 28 May 2010

  9. Protection Segment Provisioning Same list of 2-tuples at F, G, H; but provisioned as if traffic was forwarded on Protection Segment; FDB B <DA, VID> Port Out <E, 7> P2 <A, 8> P1 I J <J, 11> P2 <I, 9> P4 P4 P2 P2 A B D E C P1 P3 P3 IPG WS: P2 IPG P1 PS: P3 WS: P2 F H P2 G <I, 9> PS: P3 <A, 6> <J, 11> FDB F <E, 7> <DA, VID> Port Out <E, 7> P2 <A, 8> P1 <J, 11> P2 <I, 9> P1 9 Geneva, 28 May 2010

  10. Infrastructure Protection Switching Protection switch triggered by detection of state change in IPG Segment or manually; Requires FDB update only at endpoint bridges; Update only entries with 2-tuple in IPG list; FDB D FDB B <DA, VID> Port Out <DA, VID> Port Out P3 <E, 7> P1 <E, 7> P2 <A, 8> P2 P3 <A, 8> P1 I J <J, 11> P4 <J, 11> P2 P3 <I, 9> P2 <I, 9> P4 P3 P4 P4 P2 X P2 A B D E C P1 P1 P3 P3 IPG IPG WS: P2 WS: P2 P1 PS: P3 PS: P3 F H P2 G <I, 9> <J, 11> <A, 6> <E, 7> 10 Geneva, 28 May 2010

  11. Further Points The IPS State Machine is identical to the TESI Protection State Machine Except for the lowest-level functions that update the FDB outbound port values instead of changing the mapping from backbone service instance to BVID; The TESI Protection State Machine is similar, but not identical, to the G.8031 State Machine; IPS specifies optional M:1 protection, deployed by using an alternate Protection Segment when a Protection of higher priority is not available; IPS supports the nesting of IPGs but this requires appropriate provisioning of hold-off timer values; Further, the MA associated with the outer IPG must be provisioned to be protection switched by the inner IPG when a failure of the inner IPG occurs; 11 Geneva, 28 May 2010

  12. Thank You 12 Geneva, 28 May 2010

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