Re: [Idr] Question on IETF 105 presentation on draft-zhu-idr-bgp-ls-path-mtu

Huzhibo <huzhibo@huawei.com> Tue, 06 August 2019 12:31 UTC

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From: Huzhibo <huzhibo@huawei.com>
To: Jeffrey Haas <jhaas@pfrc.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] Question on IETF 105 presentation on draft-zhu-idr-bgp-ls-path-mtu
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Date: Tue, 6 Aug 2019 12:31:06 +0000
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Subject: Re: [Idr] Question on IETF 105 presentation on draft-zhu-idr-bgp-ls-path-mtu
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Hi Jeff:

     This is my answer to the following two questions.
     (For question one)The Minimum MTU of component links can be used for the LAG.And draft-ietf-isis-l2bundles-07 define to advertising L2 Bundle Member Link Attributes,It may also be extended for advertise the L2 Bundle Member Link MTU in BGP_LS if necessary。
     (For question two)We extend BGP_LS for MTU to calculate the MTU of the SR Policy Path, In this draft, we carry the MTU of the link through BGP_LS, For PathMtu, I think it may be extended in draft-ietf-idr-te-lsp-distribution-11 If necessary。
ths
Zhibo
-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Jeffrey Haas
Sent: Friday, July 26, 2019 10:46 PM
To: idr@ietf.org
Subject: [Idr] Question on IETF 105 presentation on draft-zhu-idr-bgp-ls-path-mtu

Here are my two questions for clarification:

1. A common problem in networks is Link Aggregate Group (LAG) component links that have MTU mis-matches.  Is there a way to use this mechanism to help detect this condition?

2. There is a draft in BFD, draft-ietf-bfd-large-packets, that provides a mechanism to test MTU.  Are you aware of this draft?  If so, have you considered how you might expose detected path MTU in your feature?

-- Jeff

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