clarifications on MAR

Hi Jerry and all

I have a question regarding draft-ash-mpls-dste-bcmodel-max-alloc-resv-01 because
i don't understand the action of bandwidth reservation mechanism.


You write:

Bandwidth allocated to individual CTs is protected as 
needed but otherwise shared. Under normal non-congested network 
conditions, all CTs/services fully share all available bandwidth. When 
congestion occurs for a particular CTi, bandwidth reservation acts to 
prohibit traffic from other CTs from seizing the allocated capacity for 
CTi

Now look at this example: I suppose 3 CTs all with normal priority

CT0-BWalloc = 30
CT1-BWalloc = 20
CT2-BWalloc = 20
Reserved Bandwidth (RBW) = 10

I suppose that :
CT0 has taken 80 units of bandwidth
CT1 has taken 5 units of bandwidth
CT2 has taken 0 units of bandwidth

Let'me say a flow arrives for CT2 needing 20 units of bandwidth (i.e., DBW 
= 5). I need to decide based on Table 2 and Table 1 whether to admit 
this flow or not.

Table 2  says Bandwidth -Not -Allowed

In this situation is the request for CT2 refuse or not? How bandwidth reservation acts to 
prohibit traffic from other CTs from seizing the allocated capacity for CT2 ?
I would understand if CT0 frees band so I can accept the request for CT2.


Thank you for the clarifications

Alessio