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Re: [lisp] LISP-GPE Review

Dino Farinacci <farinacci@gmail.com> Thu, 08 March 2018 18:32 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Date: Thu, 08 Mar 2018 10:31:58 -0800
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To: Luigi Iannone <ggx@gigix.net>
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Subject: Re: [lisp] LISP-GPE Review
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> I think this is too restrictive IMO and will will cause problem in incremental deployments. 
> 
> Imagine deploying LISP-GPE in the beta network…  we cannot because this would mean having a flag day, which is impossible.
> 
> I think would be better to have bits N, E, V to 0 when P is 1 in this way there is compatibility.
> 
> A legacy LISP data-plane box will never participate in a mapping that is not IP over IP, hence LISP-GPE can send traffic with P=1 and Next protocol equal 1 or 2.
> The legacy LISP box will receive the packet, will ignore the P bit and decapsulate as IP over IP and will work without problems.
> 
> For the other direction, legacy LISP box sending to LISP-GPE box, everything depends again on the mappings. 
> Legacy LISP will talk only to xTR that locators using IP over IP, cannot do otherwise. The receiving LISP-GPE is able to handle legacy LISP traffic.
> 
> The mappings deliver the information of "what is mapped on what"  just using LCAF, but details are out of the scope of this document. 

We have a code-point for GPE (VXLAN-GPE) in the Encapsulation Format LCAF. This document should describe the usage of this so a LISP-GPE node can tell when it RLOC-probes a LISP node that it needs to encapsulate using the RFC6830bis format.

The authors would have to decide if the VXLAN-GPE bit below would be sufficient or a new one needs to be allocated for LISP-GPE.

Dino

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