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

sujay gupta <sujay.ietf@gmail.com> Sat, 07 May 2016 07:04 UTC

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Date: Sat, 7 May 2016 00:04:05 -0700
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From: sujay gupta <sujay.ietf@gmail.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>
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Cc: ietf-hub-bangalore@ietf.org, "dhruv.dhody@huawei.com" <dhruv.dhody@huawei.com>
Subject: Re: [Ietf-hub-bangalore] IP hop by hop routing with TE
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Hi Dhruv

That's good. I believe if I have a constrained route map, i can program a
openflow directed path all across like how routeflow does.
The challenge will remain if the switches are running both OF and legacy
routing, where a label concept to distinguish constrained traffic needs to
come.
(& hence back to MPLS etc.)

But yes all the discussion we had is useful.

Regards,
-Sujay


On Fri, May 6, 2016 at 9:54 PM, Dhruv Dhody <dhruv.ietf@gmail.com>; wrote:

> Hi Sujay,
>
> Currently we are working on ONOS G release to have CSPF and PCE built in.
> But you do need to figure out which southbound to use? Can OF carry Ipv6-SR
> header?
>
> Regards,
> Dhruv
>
>
> On Sat, May 7, 2016 at 4:16 AM, sujay gupta <sujay.ietf@gmail.com>; wrote:
>
>> 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 <dhruv.ietf@gmail.com>; wrote:
>>
>>> Hi Sujay,
>>>
>>> On Fri, May 6, 2016 at 6:56 PM, sujay gupta <sujay.ietf@gmail.com>;
>>> 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 <dhruv.ietf@gmail.com>;
>>>> 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 <sujay.ietf@gmail.com>;
>>>>> 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
>>>>>>
>>>>>> _______________________________________________
>>>>>> Ietf-hub-bangalore mailing list
>>>>>> Ietf-hub-bangalore@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/ietf-hub-bangalore
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>