[ndnSIM] ndnSIM routingcost update when link fail

[Bo Tong]

Hi Alex,
   I'm studying to use ndnSIM recently, but I meet some problems in
routingcost calculating.
   The routingcost is calculating before the simulator run, but when the
link fail for a long time, the routingcost do not update while the real
rout cost has changed.
   For example,
     n1------n2-------n3
                  |           |
                  |           |
                 n4-------n5

the routingcost from n1 to n3 is 2 when all link is good. But when the link
between n2 and n3 is fail, the real rout cost from n1 to n3 has changed to
4, but the FIB of n1 show its routingcost to n3 remains to be 2, and it
influences the judgement of the function I write according to the
routingcost.
So I want to know how can the routingcost update when the link fail.

Tong Bo
National Laboratory of Next Generation Internet Interconnection Devices,
BJTU, Beijing, China
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