Re: [bess] Comments on draft-ietf-bess-evpn-pref-df

"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com> Sun, 29 September 2019 11:09 UTC

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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>, "draft-ietf-bess-evpn-pref-df@ietf.org" <draft-ietf-bess-evpn-pref-df@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Comments on draft-ietf-bess-evpn-pref-df
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Date: Sun, 29 Sep 2019 11:09:44 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/v43hRGS-yTJQwGzh121jD-q7eM0>
Subject: Re: [bess] Comments on draft-ietf-bess-evpn-pref-df
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Hi Stephane,

Please see in-line.

If you think we should add some text making my comments below more explicit, I’d be happy to do it.
Thank you.
Jorge

From: "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>
Date: Saturday, September 28, 2019 at 4:57 AM
To: "draft-ietf-bess-evpn-pref-df@ietf.org" <draft-ietf-bess-evpn-pref-df@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Subject: Comments on draft-ietf-bess-evpn-pref-df
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Resent-To: <jorge.rabadan@nokia.com>, <senthil.sathappan@nokia.com>, <prz@juniper.net>, <wlin@juniper.net>, <jdrake@juniper.net>, <sajassi@cisco.com>, <satyamoh@cisco.com>
Resent-Date: Saturday, September 28, 2019 at 4:57 AM

Hi Authors,

I had a look on your draft and I have some concerns/questions that I would like to discuss.
I like the fact of being able to tune the pref DF election per VLAN range, however:

-          Don’t you think that using a local configuration may open to inconsistent configurations resulting in issues ?
[JORGE] We discussed quite a few times whether we should signal the vlan ranges for which you desire high_pref or low_pref. We ended up coming to the conclusion that it is better/simpler (and already supported) to define virtual ethernet segments for ranges of vlans and then have the default high_pref that is defined in the spec. That is less prone to errors. E.g. on a given port, define two ranges: vlan (1-2k) --> vES-1 and [(2k+1)-4k] -->vES-2. On a given PE, vES-1 and vES-2 have different pref values.


-          How does the high_or_low works if I have more than 2 links in the ES ? (multihoming with 4 links with 4 levels of preference ?)
[JORGE] if you want 4 levels of preference so that each of the 4 PEs is DF for a range of vlans, the easiest way as discussed above is to define 4 vESes. The high_or_low is an easy way of having load balancing if you have only 2 PEs in the ES and you really want to define only one ES.

Thanks,

Stephane