Cisco 1720 install issue

Cisco 1720 install issue

I have a Cisco 1720 that will not let me install the ip route-cache flow on the interface for monitoring. This is the sh ver:
Cisco Internetwork Operating System Software
IOS (tm) C1700 Software (C1700-Y-M), Version 12.1(17), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Wed 04-Sep-02 01:30 by kellythw
Image text-base: 0x80008088, data-base: 0x806073AC

ROM: System Bootstrap, Version 12.0(3)T, RELEASE SOFTWARE (fc1)

1720toV4Net uptime is 5 weeks, 5 days, 7 hours, 25 minutes
System returned to ROM by power-on
System image file is "flash:c1700-y-mz.121-17.bin"

cisco 1720 (MPC860) processor (revision 0x501) with 15360K/5120K bytes of memory.
Processor board ID JAD04370DZL (2053300650), with hardware revision 0000
M860 processor: part number 0, mask 32
Bridging software.
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
1 Serial network interface(s)
WIC T1-DSU
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102
























I found that this version is compatible with Netflow according to the documentation but I get the following error:

1720toV4Net(config-if)#ip route-cache flow
^
% Invalid input detected at '^' marker.

1720toV4Net(config-if)#





I bought this product to be able to monitor this line and it isn't working, please help.






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