[c-nsp] Maximum spannig tree instances

[Clinton Work]

The Cisco 7600/sup720 12.2SR releases only supports the original 50K/10K 
limit in 12.2SXF. 

I have 6500/sup720 and 7600/sup720 running much higher virtual-port 
loads under 12.2SXF using MST.  I tried to get the BUs to re-test the 
STP capacity limits via our account team, but there wasn't a lot of 
interest. The 7600 BU may decide to add the 12.2SXI STP scalability 
enhancements to a 12.2SR release at a later date. 

show vlan virtual-port

Slot 1
-------
Total slot virtual ports 7482

Slot 2
-------
Total slot virtual ports 5418

Slot 3
-------
Total slot virtual ports 8260

Slot 4
-------
Total slot virtual ports 16526

Slot 5
-------
Total slot virtual ports 1

Slot 7
-------
Total slot virtual ports 22704

Slot 8
-------
Total slot virtual ports 10320

Slot 9
-------
Total slot virtual ports 6201

Total chassis virtual ports 76912



Tim Stevenson wrote:
> Hi Matt,
>
> The 6500/sup720 on 33SXI supports 100K logical ports in MST, and 12K 
> in RPVST. That's up from 50K/10K in every prior release.
>
> N7K supports 75K in MST & 16K in RPVST today. There are no per-module 
> limitations on N7K.
>
> Those numbers are based on the requirements we expressed to QA/system 
> test prior to FCS. The original numbers were confirmed prior to 33SXI 
> was released. Since then, we have not had a customer 
> requirement/request to support more, so frankly we have not felt 
> compelled to go and requalifify for anything greater. Would be curious 
> to know how many logical ports you are running today & in what protocol?
>
> Thanks,
> Tim