pcn-0----Page:8
1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43 

Coping with Failures
Provisioning against failures is expensive even for single failures
Much more expensive for multiple failures
When reroutes occur (e.g. due to failures), all real-time traffic on affected links may get degraded QoS
Better remove (pre-empt) some previously admitted flows to maintain QoS for the remaining ones
Admission by itself may not be sufficient under failures
Admission and Pre-emption can be used independently of each other


PPT Version