ping that 172.22.188.26 ip that drops packets and do this command before making any changes. Maybe we can see some interesting info.
sh mls qos int GigabitEthernet2/30 stat
Rashid Siddiqui, CCNP, CVOICE, ITIL wrote:
description Imperva-M150-app switchport
switchport private-vlan host-association 250 253
switchport mode private-vlan host
mls qos vlan-based
Now if i will change the port configuration from private vlan association from 253 to 252 ping will become OK.
I can see that you have narrowed down the problem to private-vlan 253. Can you try to change the private-vlan numbering from 253 to 203 or something other than 253. Also create the new vlan and do the necessary associations. Let's see of this makes a difference