So, I've got an MPLS provider that is prioritizing traffic and limiting bandwith on a 100Mbit connection. We've got to mark traffic using dscp designations and ACL's. We have 4 buckets. Real time (35%), Gold (25%), Silver (15%), and Default (remaining 25%).
Here's the scenario. Bandwidth utilization is at 100%. All buckets are full. Silver is filling its own bucket plus the default class. My questions are as follows:
1. If we have two systems filling the Silver (15%) bucket and the remaining default class, which system gets priority? Is it FIFO?
2. If we have two systems in Gold (25%), and they're filling the Gold bucket and begin to transmit more than 25Mbit:
a. Will it be FIFO for both systems?
b. Will Gold traffic begin to stomp on Silver traffic?
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If QoS is provided/implemented by your MPLS provider, they're the ones you need to ask. (Different platforms often implement QoS differently.)
BTW, you may need to have a NDA with your provider for they to reveal how they really will treat your traffic when there's congestion.