Re: [Ietf-hub-bangalore] IP hop by hop routing with TE

[sujay gupta <[e-mail]>]

Hi Dhruv,

Good idea on using SR, but which PCE controller has inbuilt application for
constraint based routing?

Regards.
-Sujay



On Fri, May 6, 2016 at 7:08 AM, Dhruv Dhody <[e-mail]> wrote:

> Hi Sujay,
>
> On Fri, May 6, 2016 at 6:56 PM, sujay gupta <[e-mail]> wrote:
>
>> HI Dhruv
>>
>> Thanks for the link it is a good introduction and relevant details on the
>> TE.
>>
>> So when you say PCE works currently with MPLS, I would typically need a
>> controller (PCEP controller) with a TE database and BGP-LS
>> for feeding the information, right?
>>
>
> ​Yes!
> ​
>
>
>>
>> Which comes to the next question after PCEP controller has the TED, is
>> running a CSPF path a part of the PCEP role, or an application has to be
>> build over it?
>>
>
> ​Both option exist. For in case of ODL, the application decides the path,
> in some controller the path computation algorithm is built in. ​
>
>
>
>>
>> My use case is a single IGP domain requiring light-weight TE.
>>
>> Hence my choice would be a constraint based source routing mechanism. The
>> intelligence for which can be calculated using OSPF-TE or ISIS-TE, but the
>> question
>> remains is how do set up the transport path without MPLS.
>>
>
> The protocol "PCEP" might not help you, but what if after computing the
> path you use openflow to set the "flow" (in MPLS we would call that LSP) on
> each node.
>
> Another option would be SR with IPv6 in data plane.
>
> ​and then there is this -
> https://tools.ietf.org/html/draft-ietf-isis-pcr-05 and
> http://www.ieee802.org/1/pages/802.1ca.html
>
> Hope this helps!
>
> Regards,
> Dhruv​
>
>
>
>> Regards,
>> -Sujay
>>
>>
>>
>>
>>
>> On Thu, May 5, 2016 at 5:14 AM, Dhruv Dhody <[e-mail]> wrote:
>>
>>> Hi Sujay,
>>>
>>> PCE *currently* works well with MPLS (RSVP-TE signaling or Segement
>>> Routing without signalling).
>>>
>>> If no MPLS, checkout https://datatracker.ietf.org/doc/rfc3272/ which
>>> might give you some ideas.
>>>
>>> Regards,
>>> Dhruv
>>>
>>> On Thu, May 5, 2016 at 5:37 AM, sujay gupta <[e-mail]>
>>> wrote:
>>>
>>>> Hi Group
>>>>
>>>>
>>>> I am trying to do a hop by hop IP routing with guaranteed/reserved
>>>> bandwidth for a certain traffic class.
>>>>
>>>> The decision should be dynamic, so i will need some IGP or EGP TE
>>>> extension.
>>>>
>>>> So how can I do this with a central controller? (PCE??)
>>>> And can I do this without a central controller ( equivalent to
>>>> MPLS;RSVP -TE but without MPLS)
>>>>
>>>> Any thoughts?
>>>>
>>>> Regards,
>>>> -Sujay
>>>>
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>>>>
>>>>
>>>
>>
>