Router#conf t
　　Enter configuration commands, one per line. End with CNTL/Z.
　　Router(config)#int e0/1
　　Router(config-if)#no sh
　　Router(config-if)#
　　01:22:24: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
　　01:22:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed p
　　Router(config-if)#int e0/1.2
　　Router(config-subif)#en ?
　　dot1Q IEEE 802.1Q Virtual LAN
　　sde IEEE 802.10 Virtual LAN - Secure Data Exchange
　　
　　Router(config-subif)#en dot1q
　　% Incomplete command.
　　
　　Router(config-subif)#en dot1q 2
　　Router(config-subif)#ip add 10.1.2.254 255.255.255.0
　　Router(config-subif)#int e0/1.3
　　Router(config-subif)#en dot1q 3
　　Router(config-subif)#ip add 10.1.3.254
　　% Incomplete command.
　　
　　Router(config-subif)#ip add 10.1.3.254 255.255.255.0
　　10.1.3.0 overlaps with Loopback0
　　Router(config-subif)#^Z
　　Router#sh
　　01:25:39: %SYS-5-CONFIG_I: Configured from console by console
　　Router#sh ver
　　Cisco Internetwork Operating System Software
　　IOS (tm) C2600 Software (C2600-A3JS56I-M), Version 12.1(12), RELEASE SOFTWARE ()
　　Copyright (c) 1986-2001 by cisco Systems, Inc.
　　Compiled Mon 26-Nov-01 22:47 by kellythw
　　Image text-base: 0x80008088, data-base: 0x81276E84
　　
　　ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
　　
　　Router uptime is 1 hour, 25 minutes
　　System returned to ROM by reload
　　System image file is "flash:c2600-a3js56i-mz.121-12.bin"
　　
　　cisco 2611 (MPC860) processor (revision 0x203) with 53248K/12288K bytes of memo.
　　Processor board ID JAD050101IN (4158402449)
　　M860 processor: part number 0, mask 49
　　Bridging software.
　　X.25 software, Version 3.0.0.
　　SuperLAT software (copyright 1990 by Meridian Technology Corp).
　　TN3270 Emulation software.
　　2 Ethernet/IEEE 802.3 interface(s)
　　2 Serial(sync/async) network interface(s)
　　1 ATM network interface(s)
　　32K bytes of non-volatile configuration memory.
　　16384K bytes of processor board System flash (Read/Write)
　　
　　Configuration register is 0x2102