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TRILL Working Group

TRILL Working Group. From draft 03 to draft 04 Dinesh Dutt, Cisco Silvano Gai, Nuova Radia Perlman, Sun. Agenda. Bridge vs RBridge: Reuse/Specify SVL vs IVL ST compatibility: to which extent? Other 802.1 protocols compatibility? IS-IS TLV formats. Bridge vs RBridge: Reuse/Specify.

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TRILL Working Group

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  1. TRILL Working Group From draft 03 to draft 04 Dinesh Dutt, Cisco Silvano Gai, Nuova Radia Perlman, Sun 68th IETF - Prague

  2. Agenda • Bridge vs RBridge: Reuse/Specify • SVL vs IVL • ST compatibility: to which extent? • Other 802.1 protocols compatibility? • IS-IS TLV formats From draft 03 to draft 04

  3. Bridge vs RBridge: Reuse/Specify • Data Plane • What is leveraged from .1Q and what is new • Learning • Do we support IVL and SVL? • Control Plane • What versions of STP will we support • What about non-STP protocols such as GARP, GVRP etc. From draft 03 to draft 04

  4. Data Plane (1) LLC LLC Ingress Rules Ingress Rules Port State Port State Forwarding Process EISS EISS Filtering Database Bridge Port TX/RX Bridge Port TX/RX ISS ISS 802.n 802.n LAN LAN Reuse Specify Not Sure From draft 03 to draft 04

  5. Data Plane (2) • From IEEE 802.1Q, TRILL uses: • Bridge port transmit and receive • EISS • It includes port-and-protocol-based VLAN classification • Port States • no new states are defined • Ingress Rule / Egress Rule From draft 03 to draft 04

  6. EISS (Enhanced Internal Sublayer Service) • API that provides a normalized frame (independent of tagging) to the forwarding process: • Shall we assume that the RBridge’s interface is the same ? • Assumes that TRILL header encap/decap is part of forwarding process EM_UNITDATA.indication ( destination_address, source_address, mac_service_data_unit, priority, vlan_identifier, frame_check_sequence, canonical_format_indicator, rif_information (optional) ) EM_UNITDATA.request ( destination_address, source_address, mac_service_data_unit, priority, vlan_identifier, frame_check_sequence, canonical_format_indicator, rif_information (optional) ) From draft 03 to draft 04

  7. Data Plane (3) • TRILL specifies: • Forwarding Process • Includes Encap/Decap of shim header • Filtering database extension to: • Support TRILL encap decision • Identify Egress RBridge • Identify distribution tree for multi-destination frames • Identify encapsulation and address to reach Next Hop Rbridge From draft 03 to draft 04

  8. Learning (1) IS-IS LLC LLC Ingress Rules Ingress Rules EISS EISS Filtering Database Bridge Port TX/RX Bridge Port TX/RX ISS ISS 802.n 802.n LAN LAN Reuse Specify Not Sure From draft 03 to draft 04

  9. Learning (2) IEEE 802.1Q distinguishes between VID: VLAN ID FID: Filtering ID This allows: IVL (Independent VLAN learning): one VID equal one FID SVL (Shared VLAN learning): multiple VIDs map to one FID TRILL assumes the IVL model It announces through IS-IS {MAC Address, VID} pairs learnt locally Does TRILL care about IVL and SVL issues or not ? SVL has not been fully investigated Should TRILL additionally announce FID to VID association ? From draft 03 to draft 04

  10. Control Plane (1) IS-IS ST (per port) LLC LLC Ingress Rules Ingress Rules Port State + + Port State EISS EISS Filtering Database Bridge Port TX/RX Bridge Port TX/RX ISS ISS 802.n 802.n LAN LAN Reuse Specify Not Sure From draft 03 to draft 04

  11. Control Plane (2) • TRILL adds IS-IS • Need to formally specify IS-IS TLVs • The port state is controlled by: • Designated RBridge election • Spanning Tree • We need a ST per port per VLAN • Different from classical ST that is common to all ports • We need to add an algorithm to combine the ST state and the DR state into a port State From draft 03 to draft 04

  12. Spanning Trees (1) • Which styles does TRILL support: • STP – YES • RSTP – YES • MSTP - ??? Since the original Spanning Tree Protocol (STP) has been removed from the 2004 revision of IEEE Std 802.1D, an implementation of RSTP is required for any claim of conformance for an implementation of IEEE Std 802.1Q-2003 that refers to the current revision of IEEE Std 802.1D unless that implementation includes the Multiple Spanning Tree Protocol (MSTP) specified in IEEE Std 802.1Q-2003. MSTP is based on RSTP, extended to provide support for multiple spanning trees. From draft 03 to draft 04

  13. Other Restrictions ofthe first version of TRILL • No support for: • GARP and its derivatives such as GVRP, GMRP • RIF (Routing Information) • CFI different from 0 From draft 03 to draft 04

  14. ARP/ND • Is ARP/ND support mandatory for an RBridge ? • One suggestion : • TRILL MUST provide mechanisms to carry this information in IS-IS, if known • To avoid interoperability issues • TRILL SHOULD NOT specify how to learn it • TRILL SHOULD NOT specify proxy ARP/ND behavior • TRILL implementation may decide to optimize ARP/ND • ARP/ND optimization and such can be called out in a separate draft From draft 03 to draft 04

  15. IS-IS TLV Formats • draft-ward-l2isis-01.txt has expired • Need to restart and finalize TLV formats From draft 03 to draft 04

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