1. TRILL Header Extension Simplifications Donald Eastlake 3 rd Huawei Technologies d3e3e3@gmail.com 1July 2011

2. TRILL Data Frame Format 2 Link Specific Header TRILL Header Inner Ethernet DA Inner Ethernet SA Link Specific Trailer Payload VLAN Tag Inner Frame Header Extensions July 2011

3. Table of Contents Current Header Extensions/Options – draft-ietf-trill-rbridge-options-05.txt Proposed Changes Summary of Proposal 3July 2011

4. Current TRILL Header 4 Flags OpLen Hops Nicknames | | 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. Flow ID More Flags July 2011

5. Current Header Extensions First 32 Bits Present if Ext/OpLng in TRILL Header > 0 5 Flow ID, Non-zero if valid C. H-b-H Bits Critical Hop-by-Hop Summary Bit Critical Ingress-to-Egress Summary Bit More Extended Flags Critical Ingress-to-Egress TLV Option Present Non-Critical Ingress-to-Egress TLV Option Present Non-Critical Hop-by-Hop TLV Option Present NC. H-b-H Bits C. I-t-E Bits NC. I-t-E Bit Specified in base protocol Alert ECN July 2011

6. Current Header Extensions Second 32 Bits If More Extended Flags bit is a one, there are 4 bytes of additional extended header flags as follows: Non-Critical Ingress-to-Egress Critical Ingress-to-Egress Non-Critical Hop-by-Hop Critical Hop-by-Hop 6July 2011

7. Current TLV Format Format of TLV Extensions Value …….. Length in 4-Byte Units Type Mutable Non-Critical Ingress-to-Egress 7July 2011

8. Table of Contents Current Header Extensions/Options Proposed Changes Summary of Proposal 8July 2011

9. Proposed TRILL Header 9 Flags OpLen Hops Nicknames | | | | Flags. 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. AlertECN July 2011

10. Proposed Header Extended Flag Bits Present if Ext/OpLng in TRILL Header > 0 10 C. H-b-H Bits Critical Hop-by-Hop Summary Bit Critical Ingress-to-Egress Summary Bit Critical Border RBridge Summary Bit NC. H-b-H Bits C. I-t-E Bits NC. I-t-E Bit Specified in base protocol Alert July 2011 NC. Border Bits C. Border Bits ECN

11. Proposed TLV Format Format of TLV Extensions Value …….. Length in 4-Byte Units Type Mutable Non-Critical 11July 2011 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 12July 2011

13. Proposed Actions Drop Flow-ID Field for now Drop 2 nd 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 13July 2011

14. END Donald Eastlake 3 rd Huawei Technologies d3e3e3@gmail.com 14July 2011