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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 |