What Cisco IOS support IP SLA ?

Hi Expert
I was trying to use some ip sla commands, but I found it could not work in several type of IOS. Any one can give me some suggestion ? and what kind of IOS 12.x can support the feature ? Thank you.
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Daniel SheppardSenior Network Analyst - Core & PerimeterCommented:
I believe it was called something in the earlier releases of 12 (rtr or something like that).

12.4 I know supports it, possibly even 12.3
eemoonAuthor Commented:
Thank you so much for your fast reply. I will try it
eemoonAuthor Commented:
I just tried 2691, adventerprisek9_sna-mz.124-13b.bin
but it could not work
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Daniel SheppardSenior Network Analyst - Core & PerimeterCommented:
Configuring IP SLA tracking object on 12.4 or later

(config)# ip sla 1
(config)# icmp-echo source-interface FastEthernet0/0
(config)# timeout 1000
(config)# threshold 2
(config)# frequency 3
(config)# ip sla schedule 1 life forever start-time now

(config)# track 1 ip sla 1 reachability

usage with static routing - first route is inserted into routing table as long as tracking object is reachable (AD 1), otherwise second route will be inserted into routing table (AD 5)
(config)# ip route track 1
(config)# ip route 5

You can check status of  tracking object

# show track

Check ip sla statistics

#show ip sla statistics

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eemoonAuthor Commented:
Thank you so much for your reply.
Here is my iso info, it is 12.4, but I cannot enter command "ip sla 1"

R2(config)#ip sla
R2(config)#ip sla ?
  monitor  IP Service Level Agreement Monitor
R2(config)#do sh ver        
Cisco IOS Software, 2600 Software (C2691-ADVENTERPRISEK9_SNA-M), Version 12.4(13b), RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Tue 24-Apr-07 15:33 by prod_rel_team
Daniel SheppardSenior Network Analyst - Core & PerimeterCommented:
In your version, it may be:

Try 12.4 "T" instead of mz.  It may not be fully implanted in the version you have.

Alternatively, you could try the older rtr syntax:

rtr 1
  type echo protocol ipIcmpEcho x.x.x.x
  frequency 3
  timeout 1000
   threshold 2
rtr schedule 1 life forever start-time now

Open in new window

The rest will be similar to predrag's
eemoonAuthor Commented:
I found almost all router ios are mz without T, but finally I found one which still has mz with T can work with ip sla-----unzip-c3725-adventerprisek9-mz.124-15.T5.bin, but track cannot be typed with sla in one command, below is its response, it looks like it has different way to work

R3(config)#track 1 ip sla
% Invalid input detected at '^' marker.
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