Re: [lisp] LISP Interworking: Proxy Egress Tunnel Routers

Hi Darrel,

Darrel Lewis (darlewis) schrieb:
> LISPers,
>
> The WG chairs have asked me reopen discussion on Proxy Egress Tunnel
> Routers.  We have discussed them on the WG list, and they were also
> talked about during the presentation around "LISP Deployment" by
> Margaret and Myself.
>
> To review, a Proxy Egress Tunnel Router is a LISP Network Element that
> would decapsulate traffic destined to non-LISP sites on behalf of a
> given LISP site.  Proxy Egress Tunnel Routers are not directly related
> to Proxy Ingress Tunnel Routers.  Instead, they allow an particular ITR
> to encapsulate packets it normally would forward un-encapsulated.  These
> packets would normally be forwarded by the ITR un-encapsulated.
>
>    There are two primary reasons why sites would want to utilize a PETR:
>
>    Avoiding strict uRPF failures:  Some provider's access networks
>       require the source of the packets emitted to be within the
>       addressing scope of the access networks.
>
>    Traversing a different IP Protocol:  A LISP site may want to transmit
>       packets to a non-LISP site where the some of the intermediate
>       network does not support an IP protocol (v4 or v6).  PETRs can
>       allow this LISP site's data to 'hop over' this by utilizing LISP's
>       support for mixed protocol encapsulation.
>   

I do not understand the two application scenarios and how PETRs can 
help. Could you explain that in more detail, please?

Regards,

    Michael

> Are there any objections to including text for Proxy Egress Tunnel
> Routers to the Interworking Draft?  Both of these cases are evident in
> the existing LISP beta network, and we have implementation experience
> showing that they are both possible and fairly straightforward to
> deploy.
>
> -Darrel
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>   

-- 
Dr. Michael Menth, Assistant Professor
University of Wuerzburg, Institute of Computer Science
Am Hubland, D-97074 Wuerzburg, Germany, room B206
phone: (+49)-931/31-86644 (new), fax: (+49)-931/888-6632
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