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802.1aq Shortest Path Bridging Overview for IETF

802.1aq Shortest Path Bridging Overview for IETF. Don Fedyk dwfedyk@nortel.com Editor 802.1aq. Shortest Path Bridging Project Authorization Request. Scope :VLAN Bridges Shortest Path within a region Interwork with Spanning Tree Protocols, RSTP, MSTP bridges

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802.1aq Shortest Path Bridging Overview for IETF

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  1. 802.1aq Shortest Path Bridging Overview for IETF Don Fedyk dwfedyk@nortel.com Editor 802.1aq IETF 73 November 2008

  2. Shortest Path BridgingProject Authorization Request • Scope :VLAN Bridges • Shortest Path within a region • Interwork with Spanning Tree Protocols, RSTP, MSTP bridges • This standard specifies shortest path bridging of unicast and multicast frames, including protocols to calculate multiple active topologies that can share learnt station location information, and support of a VLAN by multiple, per topology, VLAN identifiers (VIDs). • Compatibility • This amendment will not change the conformance of IEEE Std 802.1Q to Std 802. Overview and Architecture, or its relationship to that specification. IETF 73 November 2008

  3. 802.1Q Data Planes We have a long standing Data Plane 1998 2005 2008 Standard Approved Supports Data Plane OAM (CFM, MIP, MEPs) IETF 73 November 2008

  4. Applicability IEEE 802.1aq Shortest Path Bridging (SPB) Shortest Path Backbone Bridging (SPBB) Large PBB Networks 2-1000 backbone bridges Small VLAN Networks 2-100 bridges Plug and play Efficient Low delay Backwards Compatible Carrier Grade Fast convergence Efficient use of resources B-VLAN Partitioned Forwarding Compatible E-Line, E-Tree, E-LAN Services Provider E-Line, E-Tree, E-LAN Services IETF 73 November 2008

  5. SPB & SPBB Common • IS-IS protocol for shortest path trees • Must identify the source of the frame • Use a Base VID for the SPT Region • Works Ships in the Night with other protocols on other VLANs • Supports an Internal Spanning Tree in an SPT Region • Faster convergence with Link State IETF 73 November 2008

  6. SPB • SPB (802.1Q compliant) • Uses VID for source identification, don’t own the C-MAC • Solution Attributes • VID Trees, one source per bridge, distributed in IS-IS • SVL learning of unicast forwarding supported • Solution Requirements • Must Interwork at edges with RSTP, MSTP • The region may default to a single instance MSTP (associated with the “Base VID”) if the VID allocation fails or detects errors • Must support loop prevention, may support ingress check IETF 73 November 2008

  7. SPT Region Payload Payload SPVID = 22 45 45 SA SA Base VID 22 DA DA SPVID = 45 Payload SPVID = 66 Payload SPVID = 44 22 CST SA IST DA SPVID = 71 22 Payload SA DA SPVID = 41 Payload 41 VID = 6 Payload SA Payload DA 22 41 SA 22 SA DA SA DA DA SPB Concepts IETF 73 November 2008

  8. SPBB • SPBB (Shortest Path Backbone Bridging) • Solution Attributes • Single VID for an SPT Region (may use VID Trees) • Does not use learning of B-MACs • Provider addresses will all be known allows for more efficient flooding (no B-MAC broadcast storms), • Reduction in forwarding space Shared Forwarding, • Solution Requirements • Must use Multicast loop Prevention, • Must use ingress check for unicast IETF 73 November 2008

  9. IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS SPBB Operation Shortest path between any two points is both the same and symmetrical for unicast and multicast BEB Backbone Edge Bridge BEB Backbone Core Bridge BCB BCB BCB BEB BEB “A” PBBN BEB BEB Shortest Path Tree from “A” IETF 73 November 2008

  10. IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS SPBB Shortest Path Tree to/from “A” Shortest path between any two points is both the same and symmetrical for unicast and multicast BEB Backbone Edge Bridge BEB Backbone Core Bridge BCB BCB BCB BEB BEB “A” PBBN All pairs shortest path computation performed in parallel BEB BEB Uses the full mesh network IETF 73 November 2008

  11. IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS IS-IS SPBB Multicast Groups I-SID 5 I-SID 5 MMAC for 5 from A BEB Backbone Edge Bridge BEB Backbone Core Bridge BCB BCB BCB BEB BEB “A” PBBN I-SID 5 BEB BEB I-SIDs define efficient subsets IETF 73 November 2008

  12. IEEE 802.1aq ProjectWhere are we now? • Topology Distribution • IS-IS • Loop Prevention • TAP or SPBB Multicast Loop Prevention • Loop Mitigation • Optional Forwarding change Ingress Check • SPVID allocation • Leverage link State • SPBB • Multicast Source Tree identification • SPVID or B-VID&Source DA • MRP and Link State • Path Computation • Convergence time/algorithms • MSTP/RSTP/STP backwards/forwards interoperability & coexistence • Provisioning • Tree types (Shared Trees or Tree per source, etc) • MIBs • Mis-provisioning • CFM • SPB CFM • SPBB CFM Only IS-IS need TLVs Documenting compliance Documenting options Proposals in works Document Both TBD Proposal in works Documented Clause 13 TBD TBD IETF 73 November 2008

  13. What do we need from IS-IS? • Some TLVs and Sub TLVS • Per SPT Region • BASE VID (IST) • Shortest path tree algorithm • Define Single VIDs • Per Bridge • Bridge Identifier • Per Base VID • Define SPVID • Bridge Priority • Supported Multicast Groups/I-SIDs • Supported Unicast • Per Port • Per Base VID • Link Metric, Port Priority IETF 73 November 2008

  14. Acknowledgements • Many other people have contributed to SPB over the course of the project so far • Mick Seaman (Original Editor and Current Co-editor) • Ali Sajassi, Norm Finn, Janos Farkas, Paul Bottorff, Jerome Chibault, Dave Allan, Nigel Bragg • Others in IEEE 802.1 Interworking Task Group IETF 73 November 2008

  15. Other information and Pointers • http://www.ieee802.org/1/ • http://www.ieee802.org/1/files/public/ • SPB-ISIS mailing list for SPB IS-IS related discussions • If you want to subscribe to the spb-isis list you can subscribe by sending to: spb-isis-request@ietf.org With subscribe in the body. IETF 73 November 2008

  16. B-MAC Backbone MAC BEB Backbone Edge Bridge BCB Backbone Core Bridge C-VID Customer VID CFM Connectivity Fault Management CST Common Spanning Tree ELINE Ethernet Point to Point Service ELAN Ethernet LAN Service ETREE Ethernet Hub and Spoke Service FDB Filtering Data Base I-SID (802.1ah) Service Identifier IGP Interior Gateway Protocol (Typically link state) IS-IS Intermediate System to Intermediate System (IGP) IST Internal Spanning Tree LAN Local Area Network MAC Media Access Control MACinMAC see PBB MEP Maintenance End point MIP Maintenance Intermediate point MMAC Multicast MAC MSTP Multiple Spanning tree protocol MMRP Multiple MAC Registration Protocol OAM Operations, Administration and Maintenance PB Provider Bridges IEEE 802.1ad PBB Provider Backbone Bridging IEEE 802.1ah PBB-TE PBB Traffic Engineering IEEE 802.1Qay QinQ see PB S-VID Service VID SPB Shortest Path Bridging IEEE 802.1aq SPBB Shortest Path Backbone Bridging SPT Shortest Path Tree STP Spanning tree protocol RSTP Rapid Spanning tree protocol TTL Time To Live VID VLAN Identifier VLAN Virtual LAN Glossary IETF 73 November 2008

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