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Re: [mpls] comments on draft-saad-mpls-lsp-instant-install-rsvpte

John E Drake <jdrake@juniper.net> Wed, 04 November 2015 03:10 UTC

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From: John E Drake <jdrake@juniper.net>
To: Kireeti Kompella <kireeti.kompella@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] comments on draft-saad-mpls-lsp-instant-install-rsvpte
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Date: Wed, 04 Nov 2015 03:10:16 +0000
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Archived-At: <http://mailarchive.ietf.org/arch/msg/mpls/SlRz9xCtnsMo1kHPW4z4ZM0jM4Y>
Subject: Re: [mpls] comments on draft-saad-mpls-lsp-instant-install-rsvpte
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Hi,

I have a couple of observations in addition to Kireeti’s comment, below, with which I agree:

1)  If the labels that are being returned in signaling are LSP labels, then the scheme won’t work because it falls prey to the same problem you are trying to solve

2)  if the labels are IGP link labels (i.e., the ingress uses the link labels to source route packets along the same path as the LSP’s path), then you don’t need to wait for signaling to start sending packets.  However, if the ingress waits for signaling then it knows that CAC has been performed along the LSP’s path

3)  the ingress still needs LSP Self Ping to know when the LSP has been instantiated

4)  I think the combination of 2) and 3) might be useful

Yours Irrespectively,

John

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Kireeti Kompella
Sent: Tuesday, November 03, 2015 8:31 PM
To: mpls@ietf.org
Subject: [mpls] comments on draft-saad-mpls-lsp-instant-install-rsvpte

Hi Tarek, George:

I appreciate (but don't fully agree with) your motivation -- to minimize time on the temporary path.  This could be the backup path in the case of FRR, or the original path in case of reoptimization.

On the other hand, I think some might be worried about the number of forwarding changes: from original path to temporary to DLL stack to final path.  Each forwarding change can lead to some packets being dropped or reordered.  So, perhaps the objective function being optimized should be to minimize forwarding changes rather than minimize time on the temporary path.  At the very least, there should be a discussion of this in the draft (and on the list).

--
Kireeti

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