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high ping replay

hello every body

my network is core switch 3508 conected by  4 cisco switch 3560 48 port

and cisco router mpls and this ip for router is gw for all pcs in network  conected by bluecoat packet shaper 170 and packet shaper conected lan by cisco switch 3560

and all is ok

but to day when i try to ping  any devce on network is replay by 1 ms

exept router replay by 1000 ms

and network very slow cuz gateway  is high ping

i make monter for cpu and ram for every switches is in work time 50% max

and no stp configration is set

my subnet policy is /22 i cannot change it