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Which three factors does Cisco PfR use to calculate the best exit path?

Which three factors does Cisco PfR use to calculate the best exit path? (Choose three.)

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A.
quality of service

B.
packet size

C.
delay

D.
loss

E.
reachability

F.
administrative distance

8 Comments on “Which three factors does Cisco PfR use to calculate the best exit path?”

  1. mustpass says:

    CDE

    http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/performance-routing-pfr/product_data_sheet0900aecd806c4ee4.html

    Passive monitoring metrics include the following:
    • Delay: Cisco PfR measures the average delay of TCP flows for a given prefix or traffic class. Delay is the measurement of the round-trip response time (RTT) between the transmission of a TCP synchronization message and receipt of the TCP acknowledgement.
    • Packet loss: Cisco PfR measures packet loss by tracking TCP sequence numbers for each TCP flow; it tracks the highest TCP sequence number. If it receives a subsequent packet with a lower sequence number, PfR increments the packet-loss counter. Packet loss is measured in packets per million.
    • Reachability: Cisco PfR measures reachability by tracking TCP synchronization messages that have been sent repeatedly without receiving a TCP acknowledgement.
    • Throughput: Cisco PfR measures throughput by measuring the total number of bytes and packets for each interesting traffic class or prefix for a given interval of time.




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