Subject: Re: [Srcomp] The proposal text of Reference Scenarios of the analysis draft from Darren

From: Ron Bonica <[email-masked]>
Date: Tue, 2 Mar 2021 16:32:42 +0000

Folks,

I believe that the analysis should include three independent variables and one dependent variable. The independent variables are:

  *   Number of segments in the SR path
  *   Size of the SRv6 block from which all locators are drawn
  *   SID size

The dependent variable is compression efficiency.

This analysis yields eight tables. These are:

  *   CSID-16
  *   CSID-32
  *   CRH-16
  *   CRH-32
  *   VSID-16
  *   VSID-32
  *   UID-16
  *   UID-32

The numbers 16 and 32 reflect Section 4.4.4 of the requirements document.

In each table, the columns represent:

  *   Path containing 1 segment
  *   Path containing 2 segments
  *   .......
  *   Path containing 16 segments

The number 16 reflects Section 4.2.3 of the requirements document

In each table the rows represent:

  *   SRv6 block is /8
  *   SRv6 block is /16
  *   SRv6 block is /32
  *   SRv6 block is /48

These numbers modulate the addressing requirement that we will discuss tomorrow.

                                                                                                 Ron

Juniper Business Use Only
From: Srcomp <[email-masked]> On Behalf Of Weiqiang Cheng
Sent: Wednesday, February 24, 2021 7:43 AM
To: [email-masked]
Subject: [Srcomp] The proposal text of Reference Scenarios of the analysis draft from Darren

[External Email. Be cautious of content]

Hi Team,
As we discussed before, we can begin to review the proposal text of Reference Scenarios of the analysis draft from Darren.
Hope we can get closure soon and add the scenarios to the revision-01 when the submission window is open.

2.1. Encapsulation Header Size

The compression proposal MUST reduce the size of the SRv6 encapsulation header.

Encapsulation header size is evaluated against multiple reference scenarios.

2.1.1. Reference Scenario 1

A service provider offers a VPN service with underlay optimization in the SR domain.
*         Hosts H1 and H2 are located in two different sites of a VPN customer.
*         Edge nodes E3 and E4 encapsulate/decapsulate traffic between H1 and H2 to provide the VPN service.
*         A VPN SID is added to the encapsulation between E3 and E4.
*         An SR policy is applied consisting of 2 transport SIDs per domain.
*         The resulting segment list is described as 3D(2T).V (3 domains, 2 transport SIDs per domain, one VPN SID)
o    It contains at least 7 SIDs,
o    some proposals may require more SIDs be added to:
?  traverse domains
?  reach the egress node
*         This reference scenario is considered for different sub-domain sizes (i.e. number of routers in the sub-domain)
o    Proposals offering 16 or 32-bit segment sizes are evaluated.
o    A 48-bit SRv6 block size is used.

This scenario results in E and ES for 16-bit and 32-bit variants of each proposal.
16-bit SIDs
CSID
CRH
VSID
UIDSR
E(3D(2T).V)
64 octets
64 octets
72 octets
ES(3D(2T).V)
55.6%
55.6%
50%

32-bit SIDs
CSID
CRH
VSID
UIDSR
E(3D.2T.V)
80 octets
80 octets
80 octets
ES(3D.2T.V)
44.4%
44.4%
44.4%

Conclusion: In this scenario CSID and CRH performs better than other proposals

2.1.2. Reference Scenario Set 1-30

Twenty nine additional scenarios are generated using the same parameters as scenario 1 (D,T,V) by:
*         Varying the number of sub-domains in which traffic engineering is required (1 to 3).
*         Varying the number of transport SID per sub-domain (0 to 15), such that a scenario's segment list does not exceeding 16 SIDs (including the VPN SID).

This results in a total of thirty segment lists, six for 3D(0..5T).V, eight for 2D(0..7T).V, and sixteen for 1D(0..15T).V

The average encapsulation savings across all scenarios, for 16-bit and 32-bit variants of each proposal is documented in the following tables.
16-bit SIDs
CSID
CRH
VSID
UIDSR
Average ES
51.3%
49.7%
45.9%

32-bit SIDs
CSID
CRH
VSID
UIDSR
Average ES
40.1%
39.4%
42.7%

Conclusion: In this scenario set, CSID and VSID perform better than other proposals.