1) configured router with sub-interfaces and assigned vlan's to every sub-interface using dot1q
2)configured switch ports with vlan's and attachd Pc's to every vlan.
3)pc's from all vlan can ping all the subinterface and other vlans's.
4)I can't ping the router sub-interfaces from the switch
do we have to configure any more on switch or router to make switch ping all the router sub-interfaces?