Trill option improvements
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TRILL Option Improvements. Vishwas Manral IP Infusion [email protected] 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

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TRILL Option Improvements

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Trill option improvements

TRILL Option Improvements

VishwasManral

IP Infusion

[email protected]


Bit option area improvements

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


Bit option area improvements1

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


Bit option area improvements2

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


Tlv improvements

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


Tlv improvements1

TLV Improvements

  • Format of TLV Options

    • Red = Changed

Value ……..

Length in 4-Byte Units

“Type”

Mutable

Non-Critical

Ingress-to-Egress


Ecn option improvement

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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