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Re: [Idr] I-D Action: draft-ietf-idr-rpd-05.txt

Huaimo Chen <huaimo.chen@futurewei.com> Sat, 04 July 2020 02:37 UTC

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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Robert Raszuk <robert@raszuk.net>
CC: "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] I-D Action: draft-ietf-idr-rpd-05.txt
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Date: Sat, 04 Jul 2020 02:37:37 +0000
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-rpd-05.txt
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Hi Robert,

    Thank you very much for your comments.

    Our answers/explanations are inline below with prefix [HC].

Best Regards,
Huaimo on behalf of authors
________________________________
From: Robert Raszuk <robert@raszuk.net>
Sent: Wednesday, July 1, 2020 5:21 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: idr@ietf.org <idr@ietf.org>
Subject: Re: [Idr] I-D Action: draft-ietf-idr-rpd-05.txt

Hi,

I have two small suggestions about this document.

1.

I think current suggestion of NLRI content to include peer IP address is very unfortunate. I would recommend to replace it with either sender IP address or policy group ID.

Why ? As the target of the policy will be already included in the wide communities and may conflict or extend the currently defined NLRI value.

For example if you ask to apply policy X to ASN 100 it does not matter what peer address is.

If you need policy to be applicable to a specific peering point just also encode it consistently within the wide community itself.

[HC]: When a router A receives a policy X (say from a controller), router A may have a few other peers. The peer IP address indicates a specific peer (of router A) among these few peers to which the policy applies if the address is not 0. If the address is 0, the policy applies to all these peers. Using the peer IP address to indicate a specific peer for the policy can eliminate the unnecessary work that the others do to process and filter the policy. This may improve the efficiency.

2.

While the text is clear that such policy would apply to inbound and outbound peers I think it would be good to state that this is about external policy propagation.

Unless you also intend to push internal policies which would be a completely different game.

[HC]: We will state something like it is about external policy propagation in general.

Many thx,
R.

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