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Re: [irs-discuss] IRS comments

Alia Atlas <akatlas@gmail.com> Thu, 16 August 2012 02:53 UTC

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Date: Wed, 15 Aug 2012 22:53:31 -0400
Message-ID: <CAG4d1re23OD3wssMfGyPRAEUya6BQvDwoRqeTdy3xCNh0rAr+g@mail.gmail.com>
From: Alia Atlas <akatlas@gmail.com>
To: Lin Han <Lin.Han@huawei.com>
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Cc: Olen Stokes <ostokes@extremenetworks.com>, Edward Crabbe <edc@google.com>, "David Lake (dlake)" <dlake@cisco.com>, "robert@raszuk.net" <robert@raszuk.net>, "irs-discuss@ietf.org" <irs-discuss@ietf.org>
Subject: Re: [irs-discuss] IRS comments
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Good questions.

On Wed, Aug 15, 2012 at 9:56 PM, Lin Han <Lin.Han@huawei.com> wrote:
> Will IRS provide a channel for data such as data packet punt and injection? As you said inject OAM into the created LSP.

Given that an IRS agent can inject a static route or a policy-based
route, it is easy to specify an appropriate next-hop/tunnel to direct
packets to an appropriate location.
I do think that the ability to inject packets would be useful - though
I have concerns about scale for that - and it is somewhat arguable as
to whether it fits under the "routing system".

> Also, what is the good means of learning more topology and dynamic events and related state easily? Do you have any rough idea? I thought PCE has learnt all from the running protocol since it is part of the topo.

IRS is the means :-)  We're working on defining that based on the requirements.

Alia

> Lin
>
> -----Original Message-----
> From: irs-discuss-bounces@ietf.org [mailto:irs-discuss-bounces@ietf.org] On Behalf Of Alia Atlas
> Sent: Wednesday, August 15, 2012 3:12 PM
> To: robert@raszuk.net
> Cc: Olen Stokes; Edward Crabbe; David Lake (dlake); irs-discuss@ietf.org
> Subject: Re: [irs-discuss] IRS comments
>
> On Wed, Aug 15, 2012 at 3:50 PM, Robert Raszuk <robert@raszuk.net> wrote:
>>
>>>   It could just as easily describe a PCE.
>>
>>
>> PCE could be a controller just talking to headends and asking them to signal
>> LSP X with RSVP-TE or it could talk to all head, tail and via nodes and
>> actually program the forwarding label entries.
>>
>> I am observing that IRS framework is more of the former case rather then the
>> latter in general.
>>
>> However if this is the former then I am a bit not clear what value it is to
>> deliver if we compare it with current statefull PCE efforts ;)
>
> Other than providing a good means of learning more topology and
> dynamic events and related state easily??  Feedback loops - and an
> easy mechanism to, for instance, test a created LSP via OAM before
> declaring the new one up?
>
> Alia
>
>> Best,
>> R.
>>
>>
>>
>>
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