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Re: optional ethernet A-D per EVI route

"Ali Sajassi (sajassi)" <sajassi@cisco.com> Mon, 12 May 2014 05:16 UTC

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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: Jakob Heitz <jakob.heitz@ericsson.com>, "l2vpn@ietf.org" <l2vpn@ietf.org>
Subject: Re: optional ethernet A-D per EVI route
Thread-Topic: optional ethernet A-D per EVI route
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Date: Mon, 12 May 2014 05:16:35 +0000
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Cc: Antoni Przygienda <antoni.przygienda@ericsson.com>
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Hi Jakob,

We are talking about two different routes. Section 8.4.1 talks about Ethernet A-D per EVI; whereas, section 9.2.2 talks about Ethernet A-D per ES. The former one is optional but no the latter one. As the matter of fact section 8.2.1 states that the support of the latter one is mandatory (1st para).

For rev 7, I added a clarification sentence to the end of the 3rd para of section 9.2.2 saying:

       "The dependency of MAC routes installation on Ethernet A-D per ES routes,

   is to ensure that MAC routes don't get accidentally installed during
   mass withdraw period."


Cheers,

Ali

From: Jakob Heitz <jakob.heitz@ericsson.com<mailto:jakob.heitz@ericsson.com>>
Date: Sunday, May 11, 2014 9:43 PM
To: "l2vpn@ietf.org<mailto:l2vpn@ietf.org>" <l2vpn@ietf.org<mailto:l2vpn@ietf.org>>
Cc: Antoni Przygienda <antoni.przygienda@ericsson.com<mailto:antoni.przygienda@ericsson.com>>
Subject: optional ethernet A-D per EVI route

Tony and I have an issue.
The draft says
8.4.1<http://tools.ietf.org/html/draft-ietf-l2vpn-evpn-07#section-8.4.1> Constructing the Ethernet A-D per EVPN Instance (EVI) Route





   This section describes the procedures used to construct the Ethernet

   A-D per EVPN Instance (EVI) route, which is used for aliasing (as

   discussed above). Support of this route is OPTIONAL.

And

9.2.2<http://tools.ietf.org/html/draft-ietf-l2vpn-evpn-07#section-9.2.2> Route Resolution


…

   If the Ethernet Segment Identifier field in a received MAC

   Advertisement route is set to a non-reserved ESI, then if the

   receiving PE decides to install forwarding state for the associated

   MAC address, it MUST be when both the MAC Advertisement route AND the

   associated set of Ethernet A-D per ES routes have been received.


Should this sentence be changed to “Support of this route is OPTIONAL unless non-reserved ESIs are used” or just be changed to MANDATORY?

Thanks,
Jakob.

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