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Re: [manet] DLEP LID lengths

"Morgan, Keith" <kmorga07@harris.com> Mon, 19 June 2017 15:40 UTC

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From: "Morgan, Keith" <kmorga07@harris.com>
To: Stan Ratliff <ratliffstan@gmail.com>, Rick Taylor <rick@tropicalstormsoftware.com>
CC: "manet@ietf.org" <manet@ietf.org>
Thread-Topic: [manet] DLEP LID lengths
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Date: Mon, 19 Jun 2017 15:40:28 +0000
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Subject: Re: [manet] DLEP LID lengths
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Hi,

I would imagine that modems will either report MACs or LIDs consistently depending on whether they are Layer 2 or 3. For us it would just be LIDs, but derived from the routers MAC.


Regards

Keith

Keith Morgan
Director of Engineering
COMMUNICATION SYSTEMS / HARRIS DEFENCE LIMITED
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From: Stan Ratliff [mailto:ratliffstan@gmail.com]
Sent: 19 June 2017 15:34
To: Rick Taylor
Cc: Morgan, Keith (Non U.S.); manet@ietf.org
Subject: Re: [manet] DLEP LID lengths



On Mon, Jun 19, 2017 at 10:20 AM, Rick Taylor <rick@tropicalstormsoftware.com<mailto:rick@tropicalstormsoftware.com>> wrote:
All,

I've been mulling this over.

How about the LID length MUST be the same as the MAC, so it's up to the
advertiser of the LID to bit pack?

Does that mean that if a modem is using EUI-64 MACs, then the LIDs are 64 bits as well? I'm OK with that, I just think we need to state it.
Also, I think there should be a sentence about LIDs not being duplicated (and, in fact, that a LID MUST NOT duplicate an existing MAC, or vice-versa). I'd think that a duplicate LID on Destination Up would be rejected, and the Destination would not be seen as Up (Destination-level error, NOT a peer session level error).


This seems to work with existing use cases, and avoids the need for LID
length negotiation.  The only down-side I can see is that 2^48 LIDs is
a common maximum, but that seems plenty currently.

Yeah, I'm thinking that 1 modem supporting 2^48 links will cause insanity well before DLEP has a problem... ;-)

Regards,
Stan


Thoughts?

Rick

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