[Idr] locator length : draft-li-idr-flowspec-srv6

Huaimo Chen <huaimo.chen@futurewei.com> Fri, 12 March 2021 14:52 UTC

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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
CC: "idr@ietf.org" <idr@ietf.org>, Lizhenbin <lizhenbin@huawei.com>
Thread-Topic: locator length : draft-li-idr-flowspec-srv6
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Date: Fri, 12 Mar 2021 14:51:55 +0000
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Subject: [Idr] locator length : draft-li-idr-flowspec-srv6
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Hi Joel,

    Thank you very much for your comment during the IETF 110.

    Regarding to the lengths of locator(LOC)s and function(FUNCT)s in SIDs,
RFC8986 says that the locator length, is flexible, and an operator is free
to use the locator length of their choice. This seems indicating that the
operator can select the length for the locator. After their selection, the
the locator length is determined/fixed. This is illustrated by examples
in RFC8986.

    One example in the beginning of section 3.2 is as follows:
       For example, a network operator may:
          Assign block B::/48 to the SR domain
          Assign a unique B:N::/64 block to each SRv6-enabled node in the domain.
After this assignment, the length of the locators of the SIDs in the domain
is 64 bits.

    In the end of section 3.2, the text shows the Function fields of SIDs.
The length of function(FUNCT)s is 16 bits.

    When a SID is used in the domain, its locator length and function length
should have been determined.

    When an operator configures a SRv6 flow specification, involving
a SID or a group of SIDs, s/he should have known the locator length and
function length in the SID(s).

Best Regards,
Huaimo