How to enable IP SLA on cisco switch

Hi guys,
I am trying to enable IP SLA on a Cisco 4948 switch (running 'cat4500-ipbasek9-mz.122-46.SG.bin') to test CiscoWorks IPM using this swtich as a source device. But I can't run the command "ip sla monitor" on this switch. It just has "ip sla responder". Does anyone can help me, please? Is it possible to configura IP SLA on this source switch? Or can I do it only on routers?
Thanks,
Regards.
Flaviano.

IPSLA is supported in Cisco 800, 1700,1800, 2600,2800, 3500, 3750, 3600,3700, 3800, 4500, 6500, 7200, 7500, 7600, 10000, and 12000, ASR-1K Series Routers. Future support includes CRS-1, ONS ML Card, and Cisco 7970 IP phones in 2005.
IPSLA-VO (Video Operation) is supported on Cisco Catalyst 3560-X, 3750, 3750-E, 3750-X, 3650, and 3650-E Series switches & EtherSwitch Service Modules (SM-ES3G-16-P) which emulates a 3560 switch within the ISR's. You can use the EtherSwitch Serv Mod in the ISR's as well and use IPSLA-VO.
The 2900/3900 ISR's will support IPSLA-VO natively late this year.

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