Hello,everyone!I have two catlyst 6509(IOS Version 12.2(17a)SX4).And have about 30 vlan.And every vlan have a dhcp pool. cat6509-1 is the dhcp server for each vlan.And two 6509 run HSRP,cat6509-1 is the master .long long ago, several PCs in vlan16(IP...