Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

Peter Psenak <ppsenak@cisco.com> Wed, 09 December 2020 10:45 UTC

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To: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, lsr <lsr@ietf.org>
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From: Peter Psenak <ppsenak@cisco.com>
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Date: Wed, 9 Dec 2020 11:45:05 +0100
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Subject: Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
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Jimmy,

On 09/12/2020 11:10, Dongjie (Jimmy) wrote:
> Hi authors,
> 
> Here is one comment following the previous discussion on the mail list 
> and the IETF meeting.
> 
> The IP Algorithm TLV is defined to advertise the IP Flex-Algorithm 
> participation information, there is no separate TLV for IPv4 or IPv6 
> Flex-Algo participation. 

the draft clearly says:

    "The IP Flex-Algorithm participation advertised in ISIS IP Algorithm
    Sub-TLV is topology independent."


> If some nodes participate in IPv4 Flex-Algo 
> 128, and some of these nodes participate in IPv6 Flex-Algo 128, how to 
> ensure that the path computed for IPv6 Flex-Algo will not use the nodes 
> which only participate in IPv4 Flex-Algo 128?

there is no such thing as "IPv4 Flex-Algo 128" or "IPv6 Flex-Algo 128". 
There is only algo 128.

You are mixing data plane support with algo participation.

If you want an algo to only include nodes that supports specific data 
plane, you would need to define a specific algo for it.

thanks,
Peter


> 
> Best regards,
> 
> Jie
> 
> *From:*Lsr [mailto:lsr-bounces@ietf.org] *On Behalf Of *Acee Lindem (acee)
> *Sent:* Wednesday, December 2, 2020 5:13 AM
> *To:* lsr <lsr@ietf.org>
> *Subject:* [Lsr] WG Adoption Call for "IGP Flexible Algorithms 
> (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
> 
> This IP Flex Algorithm draft generated quite a bit of discussion on use 
> cases and deployment prior to IETF 109 and there was generally support 
> for WG adoption. This begins a two week WG adoption call. Please 
> indicate your support or objection to WG adoption on this list prior to 
> 12:00 AM UTC on December 16^th , 2020. Also, review comments are 
> certainly welcome.
> 
> Thanks,
> 
> Acee
>