I have 2 SG300 and 1 SG500 switch.I am trying to setup inter-VLAN routing and DHCP relay.They are connected thusly:switch1[port49]<->[port7]switch2[port48]<->[port49]switch3On switch1 I have set up VLAN3 with subnet 172.16.3.0/24 and on switch3 I hav...