70池中之物

The background is that I need to make a rate-limit on a specific port of a Cisco 2950 switch. I approch to google and found some instruction like below,

mls qos
access-list ...
class-map ...
policy-map ...

But the above just doesn't work on my switch. I turned to cisco website and checked out the spec of my switch and found the reason. It turned out that Cisco 2950 with IOS SI (Standard Image) can't support QoS, that can only be done with IOS EI (Enhanced Image). And mine is equipped with SI.

Annoying thing is that there are so many articles talking about how to set QoS on 2950, but almost none of them mentioned abou the IOS version requirement. Crappy!