[c-nsp] MST & Reserved VLANs on Nexus 5010

[Gary T. Giesen]

NX-OS definitely prevents you from mapping them to *any* instance.
I'll open a TAC case with Cisco tomorrow and see if I get anywhere.

GG

On 6/27/10, Ross Vandegrift <ross at kallisti.us> wrote:
> On Sun, Jun 27, 2010 at 12:56:29PM +0200, Joerg Mayer wrote:
>> On Fri, Jun 25, 2010 at 02:35:28PM -0400, Gary T. Giesen wrote:
>> > I've run into a bit of a problem with a couple of new Nexus 5010
>> > switches we've recently acquired. I've tried to apply our standard MST
>> > configuration, and have run into the problem that the Nexus has 81
>> > VLANs that are reserved for system use (3968 to 4047 & 4094), which
>> > are not reserved on any of our other Cisco switches. I can work around
>> > the fact I can't use these VLANs on the Nexus switches, but without
>> > the configurations being identical, I believe the Nexus switches will
>> > form a separate MST region and obviously not achieve the forwarding
>> > path I want (and make load-balancing links impossible). Has anyone
>> > ever encountered this? Any suggestions?
>> >
>> > system image file is:    bootflash:/n5000-uk9.4.1.3.N2.1.bin
>>
>> Your analysis is correct. Either you have to use different regions
>> or you will need to change the "problematic" VLANs on all other devices
>> as well.
>> AFAIK there is no way to disable the special use of the VLANs that
>> you are entiteled to use by the 802.1Q-2004 (formerly 802.1s) standard.
>
> Wait - there's no reason you have to change your mapping to avoid
> those VLANs.  Just map them to an instance and get on with life.
> Then, don't use them.
>
> If NX-OS prevents that, it's a bug.
>
> Ross
>
> --
> Ross Vandegrift
> ross at kallisti.us
>
> "If the fight gets hot, the songs get hotter.  If the going gets tough,
> the songs get tougher."
> 	--Woody Guthrie
>

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