Re: [pim] comments on draft-ietf-pim-null-register-packing-09

"Ananya Gopal (ananygop)" <ananygop@cisco.com> Fri, 10 September 2021 20:38 UTC

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From: "Ananya Gopal (ananygop)" <ananygop@cisco.com>
To: Stig Venaas <stig@venaas.com>, "zhang.zheng" <zhang.zheng@zte.com.cn>
CC: "vkamath@vmware.com" <vkamath@vmware.com>, "Ramakrishnan Chokkanathapuram Sundaram (ramaksun)" <ramaksun@cisco.com>, "rbanthia@apstra.com" <rbanthia@apstra.com>, "pim@ietf.org" <pim@ietf.org>
Thread-Topic: [pim] comments on draft-ietf-pim-null-register-packing-09
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pim/zVw4tB3Rm8RsfcHagz78c7XbkzY>
Subject: Re: [pim] comments on draft-ietf-pim-null-register-packing-09
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Hi Stig and WG,

I will post the latest version by end of day tomorrow.

Thanks,
Ananya

From: Stig Venaas <stig@venaas.com>
Date: Friday, September 10, 2021 at 1:33 PM
To: zhang.zheng <zhang.zheng@zte.com.cn>
Cc: vkamath@vmware.com <vkamath@vmware.com>om>, Ramakrishnan Chokkanathapuram Sundaram (ramaksun) <ramaksun@cisco.com>om>, rbanthia@apstra.com <rbanthia@apstra.com>om>, Ananya Gopal (ananygop) <ananygop@cisco.com>om>, pim@ietf.org <pim@ietf.org>
Subject: Re: [pim] comments on draft-ietf-pim-null-register-packing-09
Hi Sandy and authors

Thanks a lot for your input Sandy. I don't think there has been any
follow-up by the authors.

Authors, can you please respond to this? It looks like some changes
may be needed, or do you believe the latest version addresses any
concerns?

My understanding is that packing only applies to null-register, while
it makes sense to use the P-bit also in data registers.

Thanks,
Stig


On Sun, May 23, 2021 at 7:52 PM <zhang.zheng@zte.com.cn> wrote:
>
> Hi authors,
>
> Thank you for the 09 version update! The version makes more clear about the function.
>
> I have some comments for the new 09 version:
>
> 1. In the combinations 1 in section 5, there is
>
> "As specified in [[RFC7761]], the DR sends PIM Null-Register
>
>           messages towards the RP when a new source is detected."
>
> I noticed that the "Register messages" has been changed to "Null-Register messages". The change seems like to be confusion.
>
> Because "when a new source is detected", the DR sends data-register to the RP other than null-register.
>
> After the RP builds the tree to the DR, RP can set the P-bit in the register-stop message sent to the DR, that is the RP can set the P-bit when it starts to send register-stop to the DR.
>
> So IMO in this sentence, the "PIM Null-Register" may go back to "PIM register".
>
> 2. In case the RP enables the packed capability and works well, but the network manager disables the packed capability in the RP. During the switch, there may be two ways:
>
> One is that the RP can still parse the packed null-register messages, but it sends the register-stop message without P-bit set. Then the DR sends the unpacked null-register to the RP.
>
> The other is that the RP stops to parse the packed null-register messages right now, the DR may not receive the register-stop message with P-bit set/clear from the RP, then the DR may send the new un-packed register message after the timer expired and then receives the register-stop message with P-bit clear from the RP.
>
> I am not sure which one is prefer in this draft. IMO it may be better to add some description about the switch issue.
>
> Best regards,
>
> Sandy
>
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