Virtual ports on Catalyst and Nexus

Concepts:
* Virtual Interfaces
* Virtual Ports
* STP Logical Ports

Cisco Catalyst 6500
 ROUTER6k#sh vlan virtual-port

 Slot 2
 -------
 Total slot virtual ports 2832

 Slot 3
 -------
 Total slot virtual ports 672

 Slot 6
 -------
 Total slot virtual ports 54

 Slot 7
 -------
 Total slot virtual ports 5

 Slot 9
 -------
 Total slot virtual ports 5033

 Slot 10
 -------
 Total slot virtual ports 74

 Slot 11
 -------
 Total slot virtual ports 1045

 Slot 12
 -------
 Total slot virtual ports 615

 Slot 13
 -------
 Total slot virtual ports 2504

 Total chassis virtual ports 12834
 Router6k#sh vlan virtual-port
= Cisco Nexus 7000 =

 http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/C07-572834-00_STDG_NX-OS_vPC_DG.pdf

 Total stp_ports*instances:     4616
 Total ports*vlans        :     4616  <== This is what you check when you run RPVST. (Limite 16000)
 Total phy_ports*vlans    :    11193  <== This is what you check when you run in MST (Limite 90000?)

 - 16000 virtual ports with RPVST in version 6.2.2 Nexus 7k
 - 90000 virtual ports withMST in version 6.2.2 Nexus 7k 


Cisco Nexus 5500

 show spanning-tree internal info global | inc ports
 Total stp_ports*instances:     3325
 Total ports*vlans        :     3323 ----------------------> (limit is 32000)
 Total phy_ports*vlans    :     3689

 - 48000 virtual ports with RPVST or MST. Solution with L2 only, no L3.