[Xorp-users] xorp VLAN create/delete usage question

[Ben Greear]

On 10/05/2011 05:03 AM, Joe Coco wrote:
> Hello,
>
> I kind of like the idea of either an ENV or a startup option. Leaning more towards the startup option.
>
> We're (considering) using Xorp in the following scenarios:
>
> A.  Gui creates interfaces/vlans, and XORP just performs dynamic routing
> B. XORP does everything
> C. Initial interface configuration created at startup, XORP has control later on.
>
> I like the idea that based on a flag or switch, XORP would allow the adding, deleting, or modifying of any existing interface, or based on a different flag or switch XORP
> would either leave any interfaces configured alone on exit, or cleanup on exit and discard them.
>
> As to your initial concern, I don't completely understand why you would want to delete an interface from XORP's configuration but not have that interface modified in the OS.
>
> Could you explain that a little?

I have an application that drives creation/deletion of interfaces, and sets up
routing rules for them and such.  I just need xorp to run the actual routing
protocols.  I need to be able to move interfaces in and out of xorp 'virtual routers'
without them being deleted.

I'll work on some env-var over-rides.  Startup options are not easy because
we do not directly start the xorp_fea process.  It could be added to the xorp
config, but that's a lot of work:  I'd do it for hire, but I think not just
for fun :)

Thanks,
Ben


>
> -- Joe
>
> -----Original Message-----
> From: xorp-users-bounces at xorp.org [mailto:xorp-users-bounces at xorp.org] On Behalf Of Ben Greear
> Sent: Tuesday, October 04, 2011 7:07 PM
> To: Eric S. Johnson
> Cc: xorp-users at xorp.org
> Subject: Re: [Xorp-users] xorp VLAN create/delete usage question
>
> On 10/04/2011 11:53 AM, Ben Greear wrote:
>> On 10/04/2011 11:47 AM, Eric S. Johnson wrote:
>>>
>>> greearb at candelatech.com said:
>>>> I just noticed that the vlan delete logic is messing up one of my
>>>> own xorp configurations.  Basically, I want to delete a vlan from
>>>> the xorp config, but I don't want it deleted from the OS.
>>>
>>>> I can easily enough add some hack like an environment variable to
>>>> disable all vlan deletes, but I was wondering instead if I should be
>>>> more clever and maybe have xorp only delete vlans that it created?
>>>
>>> If you delete an interface that was previously created outside xotp
>>> it deletes it.
>>
>> It does now...question is whether it should?  Xorp has no concept of
>> delete interface v/s remove xorp configuration for interface.
>>
>> I was thinking that if xorp didn't create the VLAN itself, it should
>> not delete the VLAN from the OS when removing xorp configuration for
>> that interface.
>
> I just committed code that will cause xorp to only delete from the OS VLANs that it created earlier.
>
> If anyone wants an env-variable to either force the VLANS to always be deleted, or never, I'll be happy to add it.
>
> Adding a new flag to the configuration to allow users per-interface control of vlan deletion is more effort than I feel like putting in, but patches are welcome.
>
> Thanks,
> Ben
>
>>
>>>
>>> So I would think vlan behavior should follow that paradigm, by default.
>>> So I would vote for a env variable based behavior change.
>>
>> That's easily enough done, but might not be flexible enough for all
>> users...
>>
>> Perhaps a better way would be an explicit per-interface flag that
>> users could set..but that is a lot code...
>>
>> Thanks,
>> Ben
>>
>>
>>>
>>> E
>>
>>
>
>
> --
> Ben Greear<greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
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-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com