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Re: [mpls] Concerns about ISD

John E Drake <jdrake@juniper.net> Fri, 15 April 2022 18:16 UTC

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From: John E Drake <jdrake@juniper.net>
To: Tony Li <tony.li@tony.li>
CC: Haoyu Song <haoyu.song@futurewei.com>, Tianran Zhou <zhoutianran@huawei.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Concerns about ISD
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Date: Fri, 15 Apr 2022 18:16:20 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/vcX24W90MX0Io1V6eBki-HYb6Gk>
Subject: Re: [mpls] Concerns about ISD
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The last time this was discussed, Haoyu indicated that it was a requirement that the EHI must be the only SPL in the label stack, which seems a bit restrictive.

Sent from my iPhone

On Apr 15, 2022, at 2:08 PM, Tony Li <tony.li@tony.li> wrote:



[External Email. Be cautious of content]


Hi Haoyu,


Please take a look at our EH draft if you haven’t yet. The mechanism is there and the essence is that it doesn’t tamper the MPLS label stack and label semantics. That’s why I say PSD is least intrusive.


Thank you, I was unaware of it and have now looked at it.  If I understand it correctly, the EHI is the trigger to look for extension headers, all of which are in PSD.  Again, the parsing performance is a linear read to find the bottom of stack.

While it may be minimally intrusive to the label stack semantics, that doesn’t seem like a good trade-off for the performance penalty.

On a separate point, I have deep concerns about the encoding efficiency of the extension headers.  We can talk about this if and when it becomes relevant.

Tony

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