AS3750-1#ping 10.227.12.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.227.12.1, timeout is 2 seconds:

25w4d: datagramsize=100, IP 297: s=10.227.12.11 (local), d=10.227.12.1, totlen 100, fragment 0, fo 0, cef process switched
25w4d:     ICMP type=8, code=0
25w4d: datagramsize=100, IP 297: s=10.227.12.11 (local), d=10.227.12.1 (Vlan301), totlen 100, fragment 0, fo 0, sending
25w4d:     ICMP type=8, code=0
25w4d: datagramsize=100, IP 297: s=10.227.12.11 (local), d=10.227.12.1 (Vlan301), totlen 100, fragment 0, fo 0, encapsulation failed


AS3750-1#sh run int vlan 301
Building configuration...

Current configuration : 64 bytes
!
interface Vlan301
 ip address 10.227.12.11 255.255.255.0
end





---2851
interface FastEthernet0/0.301
 encapsulation dot1Q 301
 ip address 10.227.12.1 255.255.255.0
 ip helper-address 10.227.6.200
 ip nat inside
 no ip virtual-reassembly
 no snmp trap link-status