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It seems your piing dropped is very consistent, it drops in between every 11 or 12 pings.  Did you enable any vlan filtering (VACL, storm-control, srr queue, policying) on vlan 253?

hi

can u provide all the  relevent configuration ? did u try with 1000 byte size  ping  and any QoS configuration u did on the switch?

it must not be the problem of private VLAN. there must be some other problem you  have to work out.

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:

 

interface GigabitEthernet2/30

description Imperva-M150-app switchport

switchport private-vlan host-association 250 253

switchport mode private-vlan host

mls qos vlan-based

end

 

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