[Pce] 答复: A pending item for draft-peng-pce-entropy-label-position

xiong.quan@zte.com.cn Mon, 27 July 2020 06:22 UTC

Date: Mon, 27 Jul 2020 14:22:13 +0800
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From: xiong.quan@zte.com.cn
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Subject: [Pce] 答复: A pending item for draft-peng-pce-entropy-label-position
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Hi Dhruv and Stephane,

Thanks for your review and comments!

I appreciated the comments from you last meeting and updated the draft this meeting.

Multiple <ELI, EL> pairs MAY be inserted in the SR-MPLS label stack as defined in RFC8662 secssion 7.1.

So from implementation view, the ingress MUST support the capability of inserting multiple ELI/ELs.

And in case of inter-domain scenario, PCE would be useful for computing both SR path and the placement of entropy labels.

So I agree with you. We need to extend the capability at ingress node in control plane. But I think the capability is no need to be advertised by IGP protocol.

PCE might not be aware of the capability of ingress to push ELI/EL pairs. We should add the capability in OPEN message from PCC to PCE.

There are two options for us.

A, add a new bit to indicate the capability of ingress to push ELI/EL pairs.

B, reuse the E (ELP) bit to indicate the capability of inserting multiple ELI/EL pairs at PCC and support the SR path with ELP from PCE when PCC send OPEN message to PCE.

I updated the draft as the option 2. Could you please tell me what is your suggestion?

And any comments are welcome!

Thanks,

Quan

原始邮件

发件人：DhruvDhody <dhruv.ietf@gmail.com>
收件人：draft-peng-pce-entropy-label-position@ietf.org <draft-peng-pce-entropy-label-position@ietf.org>;slitkows.ietf@gmail.com <slitkows.ietf@gmail.com>;
抄送人：pce@ietf.org <pce@ietf.org>;
日 期 ：2020年07月26日 19:56
主 题 ：A pending item for draft-peng-pce-entropy-label-position

Hi Authors, Stephane,

In the last meeting [1], Stephane mentioned that the PCE is unaware of
the PCC's capability to push ELI/EL pairs and thus questioned the
usability of your I-D. He mentioned that existing information in
IGP/BGP-LS i.e. MSD, ELC, ERLD does not tell the PCC's capability to
push ELI/EL pairs.

The current draft has a single bit ELP -

A PCC sets this flag to 1 to
indicate that it supports the capability of inserting multiple ELI/EL
pairs and and supports the results of SR path with ELP from PCE.

I want to confirm if this bit and BMI-MSD enough? If not, what else?
It would be good if this can be discussed here or during the meeting.

Thanks!
Dhruv

[1] https://datatracker.ietf.org/doc/minutes-106-pce/

[Pce] A pending item for draft-peng-pce-entropy-l… Dhruv Dhody
[Pce] 答复: A pending item for draft-peng-pce-entro… xiong.quan