Mark Smith msmith at internode.com.au
Thu May 5 01:57:11 CEST 2011

On 5/05/2011 7:35 AM, Daniel Roesen wrote:
> On Wed, May 04, 2011 at 08:50:02AM -0400, Jared Mauch wrote:
>> We are all overlay networks, be it over some IEEE, ITU or other
>> transport, and ultimately an overlay network over the layer-1
>> fibers in the ground.  Each time you create an opaque tunnel you
>> make it harder to diagnose what is wrong.  Trying to figure out
>> who is dropping your GRE or IPIP or other traffic can be quite
>> hard.
> How do you do fancy traffic engineering and employ things like MPLS fast
> reroute etc. without 6PE?

I don't know about implementation status, as I've never looked, however 
work has been done on "pure IP" fast reroute methods -

RFC5286 - Basic Specification for IP Fast Reroute: Loop-Free Alternates


> Yes, I have a strong dislike of 6PE too, especially due to the "AFI
> break" in 6PE BGP NEXT_HOPs (mapped addresses). I'm nagging vendors
> since... uhhh... many years to get proper MPLS control plane, but the
> standard response is the usual "no customer demand".
> And we're also still lacking knobs to disable TTL propagation onto MPLS
> labels just for 6PE traffic...
> Best regards,
> Daniel

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