Re: [Pce] Opsdir last call review of draft-ietf-pce-stateful-pce-auto-bandwidth-10

"Joe Clarke (jclarke)" <jclarke@cisco.com> Thu, 29 August 2019 14:41 UTC

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From: "Joe Clarke (jclarke)" <jclarke@cisco.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>
CC: "ops-dir@ietf.org" <ops-dir@ietf.org>, "pce@ietf.org" <pce@ietf.org>, "ietf@ietf.org Discussion" <ietf@ietf.org>, "draft-ietf-pce-stateful-pce-auto-bandwidth.all@ietf.org" <draft-ietf-pce-stateful-pce-auto-bandwidth.all@ietf.org>
Thread-Topic: Opsdir last call review of draft-ietf-pce-stateful-pce-auto-bandwidth-10
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Date: Thu, 29 Aug 2019 14:41:14 +0000
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Subject: Re: [Pce] Opsdir last call review of draft-ietf-pce-stateful-pce-auto-bandwidth-10
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This is more informative as to the risks/impact.  Works for me.  Thanks.

Joe

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> On Aug 28, 2019, at 22:15, Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
> 
> Hi Joe,
> 
> On Wed, Aug 28, 2019 at 8:53 PM Joe Clarke (jclarke) <jclarke@cisco.com> wrote:
> 
>>>> ===
>>>> 
>>>> In section 6.6, do you have any more concrete recommendations on a reasonable
>>>> limit of LSPs with auto-bandwidth that you have discovered from testing or
>>>> operational experience?  Providing some data here may prove useful, even if it
>>>> is somewhat anecdotal.
>>>> 
>>>> 
>>> 
>>> We discussed this and felt reluctance in putting a number down in the
>>> RFC, esp when we don't do it for our base published RFCs (ex. such as
>>> how many LSPs can be delegated to a PCE). I also checked with at least
>>> one vendor and was told that it is quite dependent on the deployment
>>> scenario and would let the operator decide.
>> 
>> Maybe not a hard number, but is there any kind of example you could provide for a given scenario that provides clearer guidance on what kind of impact  each one of these LSPs would present?
>> 
> 
> How is this -
> 
> 6.6.  Impact On Network Operations
> 
>   In order to avoid any unacceptable impact on network operations, an
>   implementation SHOULD allow a limit to be placed on the number of
>   LSPs that can be enabled with auto-bandwidth feature.  For each LSP
>   enabled with auto-bandwidth feature there is an extra load on PCC, as
>   it needs to monitor the traffic and report the calculated bandwidth
>   to be adjusted to the PCE. The PCE further re-compute paths based on
>   the requested bandwidth and update the path to the PCC, which in
>   turns triggers the re-signalling of the path. All these steps adds
>   extra load and churn in the network and thus operator needs to take
>   due care while enabling this features on a number of LSPs.
> 
> Thanks!
> Dhruv
> 
>> Joe
>>