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TRILL Header Extension Simplifications

TRILL Header Extension Simplifications. Donald Eastlake 3 rd Huawei Technologies d3e3e3@gmail.com. TRILL Data Frame Format. Link Specific Header. TRILL Header. Header Extensions. Inner Ethernet DA. Inner Ethernet SA. Inner Frame. VLAN Tag. Payload. Link Specific Trailer.

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TRILL Header Extension Simplifications

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  1. TRILL Header Extension Simplifications Donald Eastlake 3rd Huawei Technologies d3e3e3@gmail.com

  2. TRILL Data Frame Format Link Specific Header TRILL Header Header Extensions Inner Ethernet DA Inner Ethernet SA Inner Frame VLAN Tag Payload Link Specific Trailer

  3. Table of Contents • Current Header Extensions/Options • draft-ietf-trill-rbridge-options-05.txt • Proposed Changes • Summary of Proposal

  4. Current TRILL Header Flags OpLen Hops Nicknames | | Flags . Flow ID More Flags TLV Extensions Critical Summary bits indicate if it is safe for a transit or egress RBridge that does not implement any extensions to process the frame.

  5. Current Header ExtensionsFirst 32 Bits • Present if Ext/OpLng in TRILL Header > 0 Alert ECN Flow ID, Non-zero if valid NC. I-t-E Bit C. I-t-E Bits C. H-b-H Bits Non-Critical Ingress-to-Egress TLV Option Present NC. H-b-H Bits Critical Ingress-to-Egress TLV Option Present Non-Critical Hop-by-Hop TLV Option Present More Extended Flags Critical Ingress-to-Egress Summary Bit Specified in base protocol Critical Hop-by-Hop Summary Bit

  6. Current Header ExtensionsSecond 32 Bits • If “More Extended Flags” bit is a one, there are 4 bytes of additional extended header flags as follows: Critical Hop-by-Hop Non-Critical Hop-by-Hop Critical Ingress-to-Egress Non-Critical Ingress-to-Egress

  7. Current TLV Format • Format of TLV Extensions Value …….. Length in 4-Byte Units “Type” Mutable Non-Critical Ingress-to-Egress

  8. Table of Contents • Current Header Extensions/Options • Proposed Changes • Summary of Proposal

  9. Proposed TRILL Header Flags OpLen Hops Nicknames | | || Flags . Alert ECN TLV Options Critical Summary bits indicate if it is safe for a transit, egress, or border RBridge that does not implement any extensions to process the frame.

  10. Proposed Header ExtendedFlag Bits • Present if Ext/OpLng in TRILL Header > 0 Alert ECN NC. I-t-E Bit C. I-t-E Bits C. Border Bits C. H-b-H Bits NC. H-b-H Bits NC. Border Bits Critical Border RBridge Summary Bit Critical Ingress-to-Egress Summary Bit Specified in base protocol Critical Hop-by-Hop Summary Bit

  11. Proposed TLV Format • Format of TLV Extensions Value …….. Length in 4-Byte Units “Type” Non-Critical Mutable 0 – hop-by-hop 1 – border RBridge 2 – ingress-egress 3 – reserved

  12. Table of Contents • Current Header Extensions/Options • Proposed Changes • Summary of Proposal

  13. Proposed Actions • Drop Flow-ID Field for now • Drop 2nd 32-bits of Extended Flags • Add “border” summary bit and TLV extension bit to accommodate possible future extension of TRILL to multi-level • Issue Working Group Last Call

  14. END Donald Eastlake 3rd Huawei Technologies d3e3e3@gmail.com

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