Re: [ODL Discuss] Multiple mount points for the same device

[Robert Varga]

On 15/12/2021 19:34, Yevgeny Shakhnovich wrote:

Hi Robert,
We allow our customers to use Restconf directly. Using Restconf, they can
create multiple netconf mount points for the same device. Unfortunately,
they consider it not as an option but as a defect.
This is a problem.

Can you supply it, please?





Regards,
Robert

Right, but given the deployment flexibility where (for example) the same device can be mounted with different credentials, we cannot really make a blanket restriction on a TCP N-tuple here. This is a use-case/deployment-specific restriction. There are a number of ways to place a policy enforcement point here, and if we are to provide a default here, we really need a complete use case description. Once we have it, we can play a number of deployment-level tricks and make sure things work the way you expect them to. Alternatively, contributions containing proper reasoning/mitigation are always welcome.

Thanks,
Yevgeny

-----Original Message-----
From: Robert Varga <n...@hq.sk>
Sent: Wednesday, December 15, 2021 7:58 AM
To: Yevgeny Shakhnovich <yevgeny.shakhnov...@ipinfusion.com>; Miroslav
Mikluš <miroslav.mik...@pantheon.tech>
Cc: Discuss@lists.opendaylight.org
Subject: Re: [ODL Discuss] Multiple mount points for the same device

On 13/12/2021 16:05, Yevgeny Shakhnovich wrote:

Hi Miroslav,

Thank you for your prompt response but I am slightly disappointed by it.
I hoped that I overlooked something.  A user can create a mount point
using Restconf and can modify this mount point using the same Restconf.
Our application cannot control it. Do you provide any interceptor that
we can use to enforce the uniqueness? I am not aware of it.

I am not sure what exactly is the use case you are asking for. You certainly
do not have to use the stock netconf-topology component, or can filter
access to the network topology through usual API gw methods.

As for uniqueness -- we are giving people flexibility to do what they
need -- and that includes having netconf topology nodes which connect to the
same device.

Regards,
Robert

Thanks,

Yevgeny

*From:* Miroslav Mikluš <miroslav.mik...@pantheon.tech>
*Sent:* Monday, December 13, 2021 12:46 AM
*To:* Yevgeny Shakhnovich <yevgeny.shakhnov...@ipinfusion.com
<mailto:yevgeny.shakhnov...@ipinfusion.com>>
*Cc:* Discuss@lists.opendaylight.org
<mailto:Discuss@lists.opendaylight.org>
*Subject:* RE: [ODL Discuss] Multiple mount points for the same device

Dear Yevgeny,

You can implement uniqueness of host, port or credentials in your own
controller application,

but I think that OpenDaylight should not assume that any of those
mount-point attributes are

fixed and user / client application should be able to change them.

Cheers,

Miroslav

*From:* Discuss@lists.opendaylight.org
<mailto:Discuss@lists.opendaylight.org>
<Discuss@lists.opendaylight.org
<mailto:Discuss@lists.opendaylight.org>> *On Behalf Of *Yevgeny
Shakhnovich
*Sent:* Thursday, December 9, 2021 5:47 PM
*To:* Discuss@lists.opendaylight.org
<mailto:Discuss@lists.opendaylight.org>
*Subject:* [ODL Discuss] Multiple mount points for the same device

Hi ODL,

We found that we can create a few Netconf mount points for the same
device by using different node-ids. So, the host, the port, the
credentials are the same. Only the node-id is different for each mount
point.  ODL does not check for uniqueness of the host/port combination.

Is it intentional? I cannot imagine a use case justifying it.

Is it possible to exclude such duplication?

We use Silicon release of ODL.

Thanks,

Yevgeny


.

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