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Increase in the Round-trip time while pinging to one of the server

Hi Dear Friends,

I have one server which is running in cisco UCS and it is connected to our core switch. and assigned that port in to vlan 2 and and all the user are in vlan 3 3.

ok today some of our users complained me that the service which is running in this server is slow. While checking on this issue i found that while pinging from the pc the roud-trip time is comming upto 850ms and some time i am getting lessthan 1ms.

what i have done

          1.)  Show interface staus     

                              no crc error

                              No collision

          2). pinging to pc's gateway we are getting good respose time

          3). pinging from core switch to the server also taking Round-trip time (1 - 750) ranges

can you advice me whay this ping taking More/Inconsist time while pinging

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