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Re: [lisp] Questions about draft-saucez-lisp-itr-graceful-03

"Darrel Lewis (darlewis)" <darlewis@cisco.com> Wed, 19 February 2014 17:30 UTC

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From: "Darrel Lewis (darlewis)" <darlewis@cisco.com>
To: Dino Farinacci <farinacci@gmail.com>
Thread-Topic: [lisp] Questions about draft-saucez-lisp-itr-graceful-03
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Date: Wed, 19 Feb 2014 17:29:54 +0000
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Cc: Damien Saucez <damien.saucez@inria.fr>, "cf(mailer list)" <cf@cisco.com>, Luigi Iannone <luigi.iannone@telecom-paristech.fr>, LISP mailing list list <lisp@ietf.org>
Subject: Re: [lisp] Questions about draft-saucez-lisp-itr-graceful-03
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On Feb 19, 2014, at 9:18 AM, Dino Farinacci <farinacci@gmail.com> wrote:

>> 1.  if you store the cache for next reboot, you will not experience
>> the miss storm when the traffic will come back to you.
>> 
>> 2.  if you shutdown an ITR, packets are forwarded to another ITR and
>> there is a miss storm as long as the prefixes in the backup ITR do not
>> cover those that where in the "down" ITR.
> 
> LISP promotes multi-homing for inbound traffic to a LISP site, as well as outbound packets from a LISP site. You deploy LISP so you can get active-active multihoming.
> 
> So this storm will typically be academic.

+1 

I've always thought that the mapping system will have to have capacity to deal with broken clients, random LIG bots, and DoS attacks (just like, say, DNS does).  This leads me to believe that over-engineering the management of sending map-requests on a given ITR will likely end up creating more complexity, and therefor fragility, in the implementation.


-Darrel

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