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

Huzhibo <huzhibo@huawei.com> Wed, 09 December 2020 12:06 UTC

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From: Huzhibo <huzhibo@huawei.com>
To: Peter Psenak <ppsenak@cisco.com>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, lsr <lsr@ietf.org>
Thread-Topic: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
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Date: Wed, 9 Dec 2020 12:05:49 +0000
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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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Hi Peter:

    If Ti-LFA can protect IP flexalgo, the native IP and SR must share the same algorithm ID.

thanks,
Zhibo

-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com] 
Sent: Wednesday, December 9, 2020 7:16 PM
To: Huzhibo <huzhibo@huawei.com>om>; Acee Lindem (acee) <acee=40cisco.com@dmarc.ietf.org>rg>; lsr <lsr@ietf.org>
Subject: Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

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
>