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The Current TRILL Header Option Feature

This document outlines the detailed specifications for TRILL (Transparent Interconnection of Lots of Links) header options. It describes the arrangement of options within the TRILL header, including critical and non-critical options, hop-by-hop versus ingress-to-egress processing, and the encoding format utilized. The Op-Length field accommodates a maximum options area of 124 bytes, and alignment requirements are specified for 32-bit structures. The material is derived from the draft-ietf-trill-rbridge-options-03.txt, serving as a foundation for this technical overview.

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The Current TRILL Header Option Feature

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  1. The Current TRILL Header Option Feature Donald E. Eastlake, 3rd 155 Beaver Street Milford, MA, 01757 USA <d3e3e3@gmail.com> TRILL Header Options

  2. Decided and Set in Concrete • There will be a TRILL options feature with options appearing between the fixed length part of the TRILL Header and the encapsulated frame. • The Op-Length field in the TRILL Header is 5 bits and is in units of 4 bytes so the maximum options area is 124 bytes. Zero indicates no options are present. TRILL Header Options

  3. Decided and Set in Concrete • TRILL Header TRILL Ethertype V R M OpLng Hop Egress RBridge Nickname Ingress RBridge Nickname Options (if any) … Size TRILL Header Options

  4. Decided and Set in Concrete • There will be a way to distinguish whether an option is • Critical or non-critical • Hop-by-hop or ingress-to-egress • If the Op-Length field is non-zero, the top two bits of the first byte of the options area indicate the presence of a critical hop-by-hop and the presence of a critical ingress-to-egress option. TRILL Header Options

  5. Other Decided Issues • Options will be 32-bit aligned. • There will be an area of bits encoded options followed by an area of TLV encoded options. • The TLV encoded options must be in the following order: • Critical hop-by-hop options • Non-critical hop-by-hop options • Critical ingress-to-egress options • Non-critical ingress-to-egress options TRILL Header Options

  6. Details in Current Draft • Format of Bit Encoded Options Area Critical Hop-by-Hop Non-Critical Hop-by-Hop Critical Ingress-to-Egress Non-Critical Ingress-to-Egress Critical Ingress-to-Egress Summary Bit Critical Hop-by-Hop Summary Bit TRILL Header Options

  7. Details in Current Draft (cont.) • Format of TLV Encoded Options Value …….. Length in Bytes “Type” Mutable Non-Critical Ingress-to-Egress TRILL Header Options

  8. Current Drafts • Material above in this presentation is fromdraft-ietf-trill-rbridge-options-03.txt which also gives details of a couple of initial options • Additional suggested options are in the following document, which is just a holding location and not intended to advance to RFC:draft-eastlake-trill-rbridge-more-options-01.txt TRILL Header Options

  9. END Donald E. Eastlake, 3rd 155 Beaver Street Milford, MA, 01757 USA <d3e3e3@gmail.com> TRILL Header Options

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