I consult for a company that has an
MPLS circuit between their Headquarters and their Disaster Recovery Site. The MPLS circuit has
3 meg of bandwidth via two bundled T1 circuits.
We have a CoS Policy on the routers on each side which effectively governs what classes get what bandwidth.
We have two main applications that use this pipe. The first application (SCADA) monitors our electrical generation capabilities and the other (netApp) is for replication traffic between HQ and the DR site.
The SCADA application pretty much runs all the time and collects data from collectors and delivers them to servers. We have it configured to run in CoS Class 2 because for this company SCADA is our top priority.
Our replication app (NetApp) is configured to run in CoS Class 4. We give it a huge amount of bandwidth in off hours when the replication is set to run. It is scaled back during the day as replication is not set to occur then.
What i want to understand is this. If we have a certain amount of bandwidth guaranteed in our CoS policy for Class 2 (we will say 400K for hypothesis sake), does the amount of available bandwidth for CoS Class 2 have the abiltiy to exceed 400K when there is not much traffic in the other classes? Or is it the case that the max amount of bandwidth ever available to Class 2 is 400K?