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Re: [lisp] Review 6830bis -08/-09

Luigi Iannone <ggx@gigix.net> Mon, 29 January 2018 12:28 UTC

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From: Luigi Iannone <ggx@gigix.net>
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Date: Mon, 29 Jan 2018 13:29:03 +0100
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To: Dino Farinacci <farinacci@gmail.com>
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Subject: Re: [lisp] Review 6830bis -08/-09
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Hi Dino,


> On 26 Jan 2018, at 19:31, Dino Farinacci <farinacci@gmail.com> wrote:
>> 
>> The fact that (P)ITRs use this mechanism does make it a data-plane mechanism. is the LISP control plane running on (P)ITRs that does it, using control plane messages.
>>>   RLOC-Probing is a method that an ITR or PITR can use to determine the
>>>   reachability status of one or more Locators that it has cached in a
>>>   Map-Cache entry.  The probe-bit of the Map-Request and Map-Reply
>>>   messages is used for RLOC-Probing.
> 
> No one said PITRs are special or different than ITRs in this regard. For both, they use the control plane messages to determine reachabiltity for RLOCs that THE DATA-PLANE encapsulates to.

May be I did not express clearly. I did not suggest that PITR and ITR are different in RLOC probing.

> The data-plane operation decides based on packet counter, RTT, TTL and other mechanisms if the RLOC is of quality for use.
> 
> Any other entity that doesn’t do packet forwarding that does mapping system lookups doesn’t consider these things. Hence, why this issue of the control-plane needs to be described in the document related to packet forwarding.
> 

Two quick comments:

1. The first sentence of the second paragraph of the RLOC Probing section clearly states that RLOC probing is a control plane mechanism based on a time.

2. RLOC Probing can be done by anybody, not only ITRs and PITRs. Any other entity can check RLOCs to make sure they are alive. As such better put the text in 6833bis.

Ciao

L.

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