You can view the private VLAN information to display the primary and secondary VLANs and I-SIDs, and also view the private VLAN port types.
enable
show vlan private—vlan <1-4059>
show interfaces gigabitethernet private-vlan
View VLAN information for private VLAN :
Switch:1(config)# show vlan private-vlan
============================================================================
                                 PRIVATE VLAN                                   
============================================================================
Primary              Primary              Secondary            Secondary        
VLAN                 ISID                 VLAN                 ISID             
----------------------------------------------------------------------------
3                    75                    5                    75                
10                   22                    15                   22                
                                                                                
All 2 out of 2 Total Num of Private Vlans displayed 
View port information for private VLAN:
Switch:1(config)#show interfaces gigabitethernet private-vlan
================================================================================ 
                               Port Private Vlans
================================================================================ 
PORT                                                  VID
NUM       TAGGING   ORIGIN     PVLAN    PVLAN TYPE    TYPE       VID
--------------------------------------------------------------------------------
2/2       enable    CONFIG     enable   promiscuous   -          -
All 1 out of 1 Total Num displayed