[c-nsp] Maximum spannig tree instances

[A.L.M.Buxey at lboro.ac.uk]

Hi,

> #sh vlan vir
> 
> Slot 1
> -------
> Total slot virtual ports 6448
> 
> Slot 2
> -------
> Total slot virtual ports 1636
> 
> Total chassis virtual ports 8084
> 
> #sh mod
> Mod Ports Card Type                              Model              Serial
> No.
> --- ----- -------------------------------------- ------------------
> -----------
>   1   16  SFM-capable 16 port 1000mb GBIC        WS-X6516A-GBIC
>   2    4  CEF720 4 port 10-Gigabit Ethernet      WS-X6704-10GE
>   5    2  Supervisor Engine 720 (Active)         WS-SUP720-3B
> 
> 
> It's pretty much always the 6516-GBIC cards that lead downstream to access
> switches that have the high virtual port counts.

yep - which is where you limit the VLANs that go down so that match what is needed
- switchport trunk allowed vlan x,y,z,666,999,blah,blah.   you are over the 1800 limit
on that blade - but are you seeing the platform exceeded in your system logs?

alan