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Re: [spring] How CRH support SFC/Segment Endpoint option?

Ron Bonica <rbonica@juniper.net> Fri, 22 May 2020 14:16 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: "Chengli (Cheng Li)" <c.l@huawei.com>, 6man <6man@ietf.org>, "spring@ietf.org" <spring@ietf.org>
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Thread-Topic: How CRH support SFC/Segment Endpoint option?
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Date: Fri, 22 May 2020 14:16:38 +0000
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Subject: Re: [spring] How CRH support SFC/Segment Endpoint option?
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Cheng,

The sole purpose of a Routing header is to steer a packet along a specified path to its destination. It shouldn't attempt to do any more than that.

The CRH does not attempt to deliver service function information to service function instances. However, it is compatible with:


  *   The Network Service Header (NSH)
  *   The Destination Options header that precedes the Routing header

Both of these can be used to deliver service function information to service function instances.

                                                                                                                     Ron




Juniper Business Use Only
From: Chengli (Cheng Li) <c.l@huawei.com>
Sent: Friday, May 22, 2020 2:56 AM
To: 6man <6man@ietf.org>; spring@ietf.org; Ron Bonica <rbonica@juniper.net>
Cc: spring@ietf.org
Subject: How CRH support SFC/Segment Endpoint option?

[External Email. Be cautious of content]

Hi Ron,

When reading the CRH draft, I have a question about how CRH support SFC?

For example, we have a SID List [S1, S2, S3, S4, S5], and S3 is a SFC related SID, how to indicate that? By PSSI? [1]

But how to know which segment endpoint node/egress node should process this PSSI? At the beginning of the SRm6 design, this is described in [2]. But you deleted the containers [2].

Without that, I don't really understand how SFC can be supported.


Best,
Cheng



[1]. https://tools.ietf.org/html/draft-bonica-spring-sr-mapped-six-01#section-4.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-bonica-spring-sr-mapped-six-01*section-4.1__;Iw!!NEt6yMaO-gk!UD4vf0darQ9cskFhH1fJ9jwZJ-nIciQxgVnf1219YuyyaNcgvNdRUdkjwP15i-Xa$>
[2]. https://tools.ietf.org/rfcdiff?url2=draft-bonica-6man-seg-end-opt-04.txt<https://urldefense.com/v3/__https:/tools.ietf.org/rfcdiff?url2=draft-bonica-6man-seg-end-opt-04.txt__;!!NEt6yMaO-gk!UD4vf0darQ9cskFhH1fJ9jwZJ-nIciQxgVnf1219YuyyaNcgvNdRUdkjwNmXwyHT$>.

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