Egress port rate limiting and rate shaping allow you to define limits for all egress traffic coming from the egress QoS profiles and traffic queues.
On the BlackDiamond X8 and 8800 series, SummitStack, and Summit family switches, you can apply single-rate rate-limiting and control shared packet buffer space (configure port port_list shared-packet-buffer command) for each port.
You can also configure ports to pass an unlimited flow as described in Disabling Rate Limiting and Rate Shaping.