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Re: [Srcomp] Section 3.4 Scalability Requirements

Ron Bonica <rbonica@juniper.net> Wed, 12 May 2021 15:30 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: "Darren Dukes (ddukes)" <ddukes=40cisco.com@dmarc.ietf.org>, "srcomp@ietf.org" <srcomp@ietf.org>
Thread-Topic: Section 3.4 Scalability Requirements
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Date: Wed, 12 May 2021 15:30:32 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/srcomp/ksJVMTYmJl_N6T8dbTr2BcRg1ZM>
Subject: Re: [Srcomp] Section 3.4 Scalability Requirements
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Folks,

I think that we are wrestling with this issue too vigorously. The following text would suffice.

"The 32-bit variants of all proposals support this scale of prefix, adjacency and services at a node. The 16-bit variants all support a similar but lesser degree of scaling".

The bitter truth is that there is no way to fit 1,000,000 pieces of information in fewer than 20 bits. Each proposal has some clever method of encoding 1.000,000 pieces of information in two 16-bit SIDS. But there is no difference between two 16-bit SIDs and a single 32-bit SID.

                                                                                               Ron





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From: Srcomp <srcomp-bounces@ietf.org> On Behalf Of Darren Dukes (ddukes)
Sent: Wednesday, May 12, 2021 7:07 AM
To: srcomp@ietf.org
Subject: [Srcomp] Section 3.4 Scalability Requirements

[External Email. Be cautious of content]

Below is the discussion text that we should include in this section:

The 32-bit variants of all proposals support this scale of prefix, adjacency and services at a node.

Each proposals 16-bit variant has some ability to support the required scale.  All proposals can encode at least 2^16 prefix, adjacency and service segments.  However each proposal has various ways of supporting some larger scale per node if required.

CRH 16-bit proposes the encoding of the ultimate segment in a TPF destination option instead of the CRH.  This supports service segments with greater scale.

VSID proposes the combination of multiple vSIDs, or the use of multiple SRv6 blocks.  This supports adjacency and service segments with greater scale.

CSID 16-bit variant uses a LIB for adjacency and service segments, the LIB allows local definition of SIDs longer than 16-bits when needed.  This supports adjacency and service segments with greater scale.

UIDSR - ShaoFu?

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