First of all what you need to know about everything in the lab for LAN can be found in this Cisco document http://goo.gl/08WJZ . It provides all the info you need about how the switch ring uses the ingress and egress queues. But if you want something more compact a good resource is the following posts from INE's blog.
- The first one is about the egress queue policing the srr bandwidth commands: http://goo.gl/upS7Q
- Next one is the first part of a two part series about SRR scheduling. Its the Bridging the gap between 3550 and 3560 QoS: Part I http://goo.gl/dhPwz
- And the Bridging the gap between 3550 and 3560 QoS: Part II: http://goo.gl/fFVSJ
Very nice posts and document.