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 11:15 UTC

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To: Huzhibo <huzhibo@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 12:15:44 +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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Zhibo,

On 09/12/2020 11:50, Huzhibo wrote:
> Hi authors,
> 
> Here are some comments about IP flexalgo as follows:
> 
> 1.In Flex-Algo draft, there is description about using fast-rerouting 
> with Flex-Algo for SR-MPLS and SRv6 data plane. It is recommended that 
> similar text be added for IP Flex-Algo.

there is a similar text in section 8, but more work is required indeed.

One important note - TI-LFA requires some form of traffic steering. This 
can be achieved by enabling both IP and SR flex-algo and use SR FA only 
to protect IP FA, similar to protection of "unlabeled" traffic with SR 
MPLS. Or some alternative mechanism for enforcing the traffic on the LFA 
path is required.

> 
> 2.Is Application-Specific Link Attribute (ASLA) MUST be used for IP 
> Flex-Algo path computation?

yes, the flex-algo application uses Flex-algo specific link attributes 
as defined in base flex-algo draft.

thanks,
Peter
> 
> Best regards,
> 
> Zhibo
> 
> *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
>