task 4.4 (ip ospf cost)

hello all,

why in the solution guide for lab3, you have adjusted the cost (ip ospf cost 65534) when dealing with virtual-circuit. I have got the same output without this command? is it correct??

Thanks
Lamine

Comments

  • The cost is required because the serial link between R4 and R5 is a backup link, and should only be used when R4's FR connection to R5 is down. (as per the Q)
  • hi mate

    By ne chance on lab 3 do you know how they calculated the cost on task 4.6
    it says cost = reference bw / interface bw

    can you calculate the following

    BW OSPF COST
    10,000 2
    10 2000
    1,544 12953

    If you can write out the formult in full for the 1st one wil be appreciated

    thanks
  • 1: 10,000

    cost = reference bw / interface bw
    by default reference b/w is 100mbs meaning 100*10^3*10^3=100000000 bits.

    for 10,000 mps link
    cost(2)= ref bw / 10,000*10^3*10^3

    2=ref bw/10000000000

    ref bw=2*10000000000=20000000000=20,000*10^3*10^3 bits= 20,000 mbps


    Thanks,
    Geeta
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