[nsp] Guaranteeing minimum bandwidth on shared access and capping the max

[Jay Nakamura]

Hello all,

The subject may be confusing because what I am trying to do is a little
confusing.

I had to believe that there is some way to do what I want to do with just
Cisco router, so I thought I will see if anyone had any brilliant ideas.

- What I want to do

Let's say there are 3 users groups.  They are all connected to a switch on
different VLANs.  All VLANs go to a Cisco router on FastEth port with
trunking.  Out the cisco router is also connection to the outside world,
let's say this is on FastEth port as well.

What we want to do is, between the 3 user groups, limit the usage (to the
outside world) to 3mbps, while guaranteeing each have certain amount of
minimum bandwidth so one user group doesn't hog all the bandwidth.  Let's
say 512kbps each.

Does that explain well enough what I am wanting to do?  Any ideas on how to
implement this?

If the outgoing interface is a T1, and the max is the T1 bandwidth, I have
figured out a way to do this really nicely with priority queuing and CAR but
this one has stumped me.

Thanks,

- Jay