Re: [mpls] MPLS-RT for draft-kompella-mpls-larp

Xufeng Liu <> Fri, 03 December 2021 21:28 UTC

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From: Xufeng Liu <>
Date: Fri, 03 Dec 2021 16:28:10 -0500
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To: Tarek Saad <>
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Subject: Re: [mpls] MPLS-RT for draft-kompella-mpls-larp
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Hi Authors,

I have reviewed the document and I think that the document is useful by
addressing a gap for network operations. The approach is technically sound
and easily implementable. The document is coherent. It is ready to be
considered for WG adoption.

Here are a few comments that can wait until the WG adoption.

1. The aging/timeout mechanism used by Ethernet ARP is not mentioned in
this document. Is it intended to recommend implementing such a mechanism?

2. It is understandable that the initial use case came from MPLS over
Ethernet, but is this mechanism Ethernet dependent, or usable for other
types of hardware (at least in theory)?

3. Sec 3.3. says that “1. checks if it has reachability to H3.” Is this
check for “IP reachablity”, or MPLS reachability with an available
lable stack that can be used to reach H3?

4. In Figure 3. of Sec 5.1., there is “ ... (3 octets)”. Should it be “2
octets” here? Also, if these 2 octets are not used, why 6 is chosen as the
hardware address length?


- Xufeng

On Mon, Nov 8, 2021 at 11:19 AM Tarek Saad <> wrote:

> Hi Xufeng/Yingzhen/Rakesh,
> You have been selected as potential MPLS-RT reviewers for
> draft-kompella-mpls-larp-10.
> Note to authors: You have been CC'd on this email so that you can know
> that this review is going on.
> Reviews should comment on whether the document is coherent, is it useful
> (ie, is it likely to be actually useful in operational networks), and is
> the document technically sound?  We are interested in knowing whether the
> document is ready to be considered for WG adoption (ie, it doesn't have to
> be perfect at this point, but should be a good start).
> Reviews should be sent to the document authors, WG co-chairs and WG
> secretary, and CC'd to the MPLS WG email list. If necessary, comments may
> be sent privately to only the WG chairs.
> If you have technical comments you should try to be explicit about what
> *really* need to be resolved before adopting it as a working group
> document, and what can wait until the document is a working group document
> and the working group has the revision control.
> Can you review the document by November 26, 2021?
> Regards,
> Tarek (as MPLS WG chair)