I'm trying to enable Qos on my campus network but I can enable the mls Qos command under the global configuration mode I don't know if the qos service is supported by my Ios version which is 12.0<5>WC9a.
By the looks of it you have an old 2900XL or 3500XL, both of which are end of life and don't support QoS. Post the model numbers of your switches since QoS is very platform specific with Cisco Catalyst switches.
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