Diff-Serv Traffic Engineering
Page 112 7450 ESS MPLS Guide
According to the RDM admission control policy:
Reserved (CT1, 0) = 50 <= 100 Mbps
Reserved (CT0, 0) + Reserved (CT1, 0) = 50 <= 200 Mbps
This results in the following unreserved bandwidth calculation.
Unreserved (CT1, 0) = BC1 – Reserved (CT1, 0) = 100 – 50 = 50 Mbps
Unreserved (CT0, 0) = BC0 – Reserved (CT0, 0) – Reserved (CT1, 0) = 200 – 0 – 50= 150 Mbps.
Note that bandwidth reserved by a doll is not available to itself as well any of the outer dolls.
Suppose now another LSP comes with CT0, setup and holding priorities of 0 and a bandwidth 120
Mbps.
Figure 26: Second LSP Reservation
Reserved (CT0, 0) = 120 <= 150 Mbps
Reserved (CT0, 0) + Reserved (CT1, 0) = 120 + 50 = 170 <= 200 Mbps
Unreserved (CT0, 0) = 150 -120 = 30 Mbps
If we simply checked BC1, the formula would yield the wrong results:
Unreserved (CT1, 0) = BC1 – Reserved (CT1, 0) = 100 -50 = 50 Mbps
al_0208
BC0
BC1
50 MB, Reserved
120 MB, Reserved,
20 MB taken from CT1
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