Re: [trill] Routing directorate QA review of draft-ietf-trill-rfc6439bis
Donald Eastlake <d3e3e3@gmail.com> Sun, 03 July 2016 17:53 UTC
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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Sun, 03 Jul 2016 13:53:38 -0400
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To: "Joel M. Halpern" <jmh@joelhalpern.com>
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Cc: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "trill-chairs@tools.ietf.org" <trill-chairs@tools.ietf.org>, draft-ietf-trill-rfc6439bis@ietf.org, "trill@ietf.org" <trill@ietf.org>
Subject: Re: [trill] Routing directorate QA review of draft-ietf-trill-rfc6439bis
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Hi Joel, Thanks for your comments. Because this draft happens to be close to expiring and we are coming up on the refractory period before the Berlin meeting, I'm going to do my best at editing it based on your comments and upload a revision. But if that does not resolve your comments, further changes can be made. See below. On Sun, Jun 26, 2016 at 8:58 PM, Joel M. Halpern <jmh@joelhalpern.com> wrote: > This is a QA review, intended to provide an additional perspective, > requested by the TRILL chairs and Routing ADs. > The reviewer understands that the WG last call has completed, and hopes that > this review will prove helpful to the working group. > [For clarity, the above is written before performing the review.] > > This document is ready for publication as a Proposed Standard RFC. > > Major: N/A > > Minor: N/A > > Nits: > Section 2.2 base has two bullet items. the first appears to be a subset > of the second. Is this deliberate? You are correct. I guess as an author I thought of the second point as being more restricted than the words actually are. I was thinking it actually said something like "When it observes a change in DRB on the link from one RBridge other than itself to another RBridge other than itself." However, it seems like it would be clearer to re-write that small section of text. > The counter-example at the end of the second paragraph of section 2.4 > seems to be missing some limitation that would explain it. (It is possible > this is more obvious to a reader who is more conversant with TRILL, but > there does seem to be something missing.) Maybe the wording isn't very clear. Let me describe the counter example somewhat more verbosely in different words. Say that all the end stations in a TRILL campus that are in VLAN-x are attached to RBridge-1. That means that they are on links that is attached to RBridge-1 and there might be one or more other RBridges attached to those links. (Note that in TRILL, a link can be a bridged LAN.) On each such link, there will be a Designated RBridge election to chose the RBridge that is in charge of end station traffic on that link, either ingressing/egress such traffic itself or assigning it to one or more other RBridges on that link by VLAN. Assume that RBridge-1 is overloaded. Thus RBridge-1 will typically do a poor job of forwarding traffic, because it cannot hold the complete topology. Normally, you would not want RBridge-1 handling end station traffic. If RBridge-1 wins the DRB election on a link, it should assign the handling that traffic to other non-overloaded RBridges on its links, if such RBridges are available, and if some other RBridge on a link wins the DRB election, it should not assign the handling of such traffic to RBridge-1. However, in the case of VLAN-x traffic, all the end stations in VLAN-x have local connectivity to RBridge-1. The inability of RBridge-1 to do a good job forwarding traffic is immaterial to traffic in VLAN-x because it will never have to forward it because all end stations in VLAN-x are local. Thus, even through RBridge-1 is in overload, it SHOULD be assigned the handling of end station traffic for VLAN-x. I'll try to clarify the wording in the draft. > Editorial: > In section 10.4 defining the FGL-VLAN Mapping Bitmap APPsub-TLV, the > diagram calls the fifth field "Starting FGL". The text below that refers to > it the field simply as "FGL". I believe the text should also name it > "Starting FGL". OK. > Side note: I really appreciate the thorough additional explanations as to > the reasons various actions are safe or unsafe. Thank you. You're welcome, Donald =============================== Donald E. Eastlake 3rd +1-508-333-2270 (cell) 155 Beaver Street, Milford, MA 01757 USA d3e3e3@gmail.com > Yours, > Joel M. Halpern
- Re: [trill] Routing directorate QA review of draf… Donald Eastlake
- Re: [trill] Routing directorate QA review of draf… Joel M. Halpern
- Re: [trill] Routing directorate QA review of draf… Donald Eastlake
- [trill] Routing directorate QA review of draft-ie… Joel M. Halpern