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TRILL Option Improvements

This document outlines critical improvements to the TRILL (Transparent Interconnection of Lots of Links) protocol’s Bit Option area and TLV (Type-Length-Value) structure. Key updates include a fixed location for the Flow ID, enhancements for more efficient parsing of TLV options, and new bit indicators for option presence. Implementations are suggested for both non-critical and critical options in ingress-to-egress and hop-by-hop scenarios. Notably, the ECN (Explicit Congestion Notification) will be integrated into the TRILL header, aligning it with the IP header for consistency. These improvements aim to streamline operations and enhance performance.

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TRILL Option Improvements

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  1. TRILL Option Improvements VishwasManral IP Infusion vishwas.ietf@gmail.com

  2. Bit Option Area Improvements • Fixed location for Flow ID so it will be easier to use in the fast path • Bits to indicate presence of different types of TLV options to reduce need to parse TLV Area • Bit Area expansion bit • Fix store back of ECN

  3. Bit Option Area Improvements • Format of Bit Options Area Flow ID C. I-t-E Bits NC. I-t-E Bit 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 Bit Options Flow ID Valid Bit Critical Ingress-to-Egress Summary Bit Critical Hop-by-Hop Summary Bit

  4. Bit Option Area Improvements • A “Critical Hop-by-Hop TLV Option Present” bit is not needed because you can just check the top two bits of the first byte of the TLV Options area if OpLng is big enough. • If “More Bit Options” bit is a one, there are 4 bytes of additional bit options as follows: Critical Hop-by-Hop Non-Critical Hop-by-Hop Critical Ingress-to-Egress Non-Critical Ingress-to-Egress

  5. TLV Improvements • Length in units of 4-bytes, since TLV options are 32-bit aligned • No currently proposed option makes use of the current 1-byte granularity of the length field • Result is a bigger Type field

  6. TLV Improvements • Format of TLV Options • Red = Changed Value …….. Length in 4-Byte Units “Type” Mutable Non-Critical Ingress-to-Egress

  7. ECN Option Improvement • ECN (Explicit Congestion Notification): optionally indicated in TRILL Header Bit Option area. Copied to TRILL Header from IP Header on ingress and copied to IP Header from TRILL Header on egress. • Change to be the same as IPsec tunneling and to copy back on egress only if IP Header indicates ECT(0) or ECT(1).

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