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RE: Size of CR in CRH

Robert Raszuk <robert@raszuk.net> Wed, 20 May 2020 22:19 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 21 May 2020 00:19:33 +0200
Message-ID: <CAOj+MMFsy=dDciY=TMwSf75CZCr_i1Mfv6oUiPs5U6hT2Bq94w@mail.gmail.com>
Subject: RE: Size of CR in CRH
To: Ron Bonica <rbonica@juniper.net>
Cc: 6man <6man@ietf.org>
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HI,

So just to make sure I understand this analogy of 16 bit -- 2^16 = 65536
nodes. I think this is only on paper.

Imagine I have 1000 routers so if I divide the 16 bit space by 1000 I get
at most 65 local node behaviours if anyone would like to embed such into
the SID.

That means that if my router have more then 65 interfaces I am not able to
steer packets by src route out of my router ... I must always depend on the
lookup of next SID how to forward the packets.

That also means that if I want to apply any form of NP in segment endpoint
I am quite limited to the number of local functions I could use.

To conclude - Let me restate to what I and others already said - flat SID
space domain wide in mapping plane is a mistake. Yes this is like MPLS, but
this does not make it great again due to that legacy.

Many thx,
R.

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