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Re: [ieee-ietf-coord] draft-richardson-anima-ipv6-lldp

"Rob Wilton (rwilton)" <rwilton@cisco.com> Wed, 15 April 2020 13:51 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Paul Congdon <paul.congdon@tallac.com>, Russ Housley <housley@vigilsec.com>
CC: "<ieee-ietf-coord@ietf.org>" <ieee-ietf-coord@ietf.org>
Thread-Topic: [ieee-ietf-coord] draft-richardson-anima-ipv6-lldp
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Date: Wed, 15 Apr 2020 13:50:55 +0000
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Subject: Re: [ieee-ietf-coord] draft-richardson-anima-ipv6-lldp
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Hi Paul,

Thanks for reviewing the draft.  I hadn’t read it previously (new AD), but having done so, I can certainly understand your concerns!

Would you like to provide the feedback direct to the ANIMA WG and the authors, or would you like me to relay your comments?

Regards,
Rob


From: ieee-ietf-coord <ieee-ietf-coord-bounces@ietf.org> On Behalf Of Paul Congdon
Sent: 09 April 2020 20:24
To: Russ Housley <housley@vigilsec.com>
Cc: <ieee-ietf-coord@ietf.org> <ieee-ietf-coord@ietf.org>
Subject: Re: [ieee-ietf-coord] draft-richardson-anima-ipv6-lldp

I've had a brief look at this draft.   My personal belief is that this is a gross miss-use of the LLDP protocol.  LLDP is NOT a general L2 transport protocol.   It is intended to exchange a 'relatively' static local database with neighbors.   When an LLDP agent receives a frame, it is supposed to compare what it received with what it received the last time and if anything is different, it will throw away all of the previous information, replace the database with the most recently received information and 'wake-up' the higher layers to process the changes.  The expectation (and design center for the protocol) is that things do NOT change frequently.  Assuming the IPv6 packets are intending to implement their own protocol and will be changing frequently, encapsulating an IPv6 packet inside an LLDP TLV would signal a change on each transmission and possibly cause an SNMP TRAP on each packet received by a traditional implementation.   If I understand the use case correctly, the draft is seriously miss-using the protocol and I believe others within 802.1 would agree with me.

Paul


On Thu, Apr 9, 2020 at 11:47 AM Russ Housley <housley@vigilsec.com<mailto:housley@vigilsec.com>> wrote:
There was a discussion of draft-richardson-anima-ipv6-lldp on the ANIMA WG virtual interim meeting earlier today.  It would be great if someone familiar with LLDP could take a look at the Internet-Draft and let the group know if there is a better way to proceed.

Russ

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