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Re: [L3sm] New Version Notification for draft-wu-l3sm-rfc8049bis-03.txt

"Jan Lindblad (jlindbla)" <jlindbla@cisco.com> Wed, 11 October 2017 08:39 UTC

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From: "Jan Lindblad (jlindbla)" <jlindbla@cisco.com>
To: Qin Wu <bill.wu@huawei.com>
CC: "David Ball -X (daviball - ENSOFT LIMITED at Cisco)" <daviball@cisco.com>, l3sm <l3sm@ietf.org>
Thread-Topic: [L3sm] New Version Notification for draft-wu-l3sm-rfc8049bis-03.txt
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Date: Wed, 11 Oct 2017 08:38:19 +0000
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Subject: Re: [L3sm] New Version Notification for draft-wu-l3sm-rfc8049bis-03.txt
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[DB]
Yes, that makes sense.  Should they also be strict inequalities, or is it ok if l4-src-port is equal to lower-port?

[Qin]: Good comment, fixed with
“
must "'.' < '../ipv4-dst-port-range/lower-port' or '.' > '../ipv4-dst-port-range/upper-port'" {
”

I'm afraid this expression will not to what you expect. This compares a constant one letter string to another constant string, or:ed with a constant string compared to another constant string. This will be constantly true or false, and not depend on any configuration data. Also, the dot (.) object is treacherous. Except in some extremely odd cases, what you mean is actually current().

So I would propose
must "current() < ../ipv4-dst-port-range/lower-port or current() > ../ipv4-dst-port-range/upper-port" {

/jan

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