I just wanted to see if this is even possible.
I have a 3750 switch as the main switch at each of my outlying sites. They connect to the core via 100Mbs fiber, at the Core is a 4507 switch.
On the 3750 I have 4 vlans, Guest, management, users and phone. I want to configure QOS such that all but the phone vlan share 90 Mbs and leave a nice fat pipe for Phones at 10Mbs.
As far as I know policing will not work in the outbound direction on the 3750 so that leaves me with trying to figure out how to get 3 vlan interfaces to share 90% of the bandwidth. What I have now is 45Mbs to user, 40Mbs to management and 1Mbs to guest. If possible I would like the management, user and guest to share 90Mbs so I don't have to police them to half the bandwidth to ensure the phone bandwidth.
At this point I am thinking it can not be done, anyone care to set me straight on this?
The 3750 uses SRR on both the ingress and egress queues. On the egress queues SRR can use either shared mode or shaped mode.
Shaped mode allows you to allocate a bandwidth to each of the 4 egress queues and these queues are then rate-limited. However it is important to note that if one of the queues is not being fully used that spare bandwidth cannot be used by another queue. With shared mode you can.
So you can rate-limit traffic on egress ports with the above provisos.