Ставьте EMI IOS:
CAT2#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(20)EA1a, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Mon 19-Apr-04 21:50 by yenanh
Image text-base: 0x00003000, data-base: 0x008273B8
ROM: Bootstrap program is C3550 boot loader
CAT2 uptime is 1 week, 2 days, 3 hours, 28 minutes
System returned to ROM by power-on
System image file is "flash:c3550-i5q3l2-mz.121-20.EA1a/c3550-i5q3l2-mz.121-20.EA1a.bin"
cisco WS-C3550-24-PWR (PowerPC) processor (revision E0) with 65526K/8192K bytes of memory.
Processor board ID CAT0748X0W7
Last reset from warm-reset
Bridging software.
Running Layer2/3 Switching Image
Ethernet-controller 1 has 12 Fast Ethernet/IEEE 802.3 interfaces
Ethernet-controller 2 has 12 Fast Ethernet/IEEE 802.3 interfaces
Ethernet-controller 3 has 1 Gigabit Ethernet/IEEE 802.3 interface
Ethernet-controller 4 has 1 Gigabit Ethernet/IEEE 802.3 interface
24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)
The password-recovery mechanism is enabled.
195K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:0E:83:DA:5E:00
Motherboard assembly number: 73-8100-07
Power supply part number: 341-0029-02
Motherboard serial number: CAT0748030P
Power supply serial number: LIT0742004U
Model revision number: E0
Motherboard revision number: A0
Model number: WS-C3550-24PWR-EMI
System serial number: CAT0748X0W7
Configuration register is 0x10F
CAT2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
CAT2(config)#int tunnel 0
CAT2(config-if)#?
Interface configuration commands:
access-expression Build a bridge boolean access expression
arp Set arp type (arpa, probe, snap) or timeout
bandwidth Set bandwidth informational parameter
carrier-delay Specify delay for interface transitions
cdp CDP interface subcommands
default Set a command to its defaults
delay Specify interface throughput delay
description Interface specific description
exit Exit from interface configuration mode
help Description of the interactive help system
hold-queue Set hold queue depth
ip Interface Internet Protocol config commands
keepalive Enable keepalive
l2protocol-tunnel Tunnel Layer2 protocols
load-interval Specify interval for load calculation for an
interface
logging Configure logging for interface
macro Command macro
max-reserved-bandwidth Maximum Reservable Bandwidth on an Interface
no Negate a command or set its defaults
ntp Configure NTP
service-policy Configure QoS Service Policy
shutdown Shutdown the selected interface
snmp Modify SNMP interface parameters
spanning-tree Spanning Tree Subsystem
tcam tcam keyword
timeout Define timeout values for this interface
transmit-interface Assign a transmit interface to a receive-only
interface
tunnel protocol-over-protocol tunneling
tx-ring-limit Configure PA level transmit ring limit