[c-nsp] Short pipe with Inter-as option 10b

[David Curran]

+1 for 10a.  We've yet to have an instance where 10a wouldn't suit our needs
and its much less headache than 10b (IMHO).

-d

> From: "Oliver Boehmer (oboehmer)" <oboehmer at cisco.com>
> Date: Fri, 6 Jun 2008 08:48:20 +0200
> To: Vikas Sharma <vikassharmas at gmail.com>, <cisco-nsp at puck.nether.net>,
> "Krishnaji Panse (kpanse)" <kpanse at cisco.com>, "Tom Mulvey (tmulvey)"
> <tmulvey at cisco.com>
> Conversation: Short pipe with Inter-as option 10b
> Subject: Re: [c-nsp] Short pipe with Inter-as option 10b
> 
> Vikas Sharma <mailto:vikassharmas at gmail.com> wrote on Friday, June 06,
> 2008 5:11 AM:
> 
>> Hi,
>> 
>> Need your expert comment on what QoS mechanism to be used for
>> Inter-As option 10b, pipe mode or short pipe mode. This is for ISP
>> setup. What is the trend in ISP industry?
> 
> well, Inter-Provider QoS is still a general challenge (whether it is
> MPLS-VPN InterAS or plain IP interconnectivity).
> My personal take on this (possibly not having a conclusive picture of
> what's being done):
> 
> - On the ASBR in a 10b setup, packets are rcvd and sent labelled, so
> pipe vs. short-pipe doesn't apply (the difference between pipe and
> short-pipe is the QoS classification on the IPv4 PE-CE link at the very
> edge of the network).
> 
> - If 10b is used and the QoS classes don't match, you re-classify by
> changing EXP bits of the top label, so the ASBR plays the same role as a
> P node, and changing MPLS PHB on P devices is possible with any MPLS
> Diffserv tunneling modes, including uniform mode, so the question pipe
> vs. short-pipe doesn't apply.
> 
> - Many providers actually prefer Inter-AS option 10a as they can look at
> the IPv4 header to apply granular filtering and QoS. Obviously, 10a has
> scalability challenges, and a new Inter-AS option 10d (or 10a+b)
> draft-kulmala-l3vpn-interas-option-d addresses those by combining the
> IPv4 forwarding properties of 10a with the scalable vpnv4 control plane
> of 10b, so I might also call this a "trend".
> 
> my 2c
> 
> oli
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