Example

You want to assign a priority of 5 to a VoIP flow that is destined to an IP 600 phone switch. You also want to police the port that receives the VoIP data to 5 Mbps.

1. You set up an ACL rule that associates a priority of 5 with the destination IP address of the VoIP flow. (VoIP traffic cannot tolerate latency or frame loss, so it needs a high priority to ensure its timely delivery.)

Note: Priority 5 serves as an example only. Actual implementations may vary.

2. You enable policing on the port that will receive the VoIP flow and set the guaranteed bit rate to 5 Mbps.
3. The switch stores packets that match the ACL rule in queue 5. (The switch stores packets in the queue that matches their priority.)
4. The switch forwards the VoIP traffic in queue 5 as long as its bit rate does not exceed 5 Mbps. If the bit rate of the queue exceeds 5 Mbps, the switch drops the excess traffic.