modify reference bandwidth in ospf

Unanswered Question
Jul 17th, 2008

Can any body suggest me the command , if I want to modify Auto-Reference path cost in OSPF. My requirement is as-----

10,000(Bandwidth in Mbps)-> 2(Cost)

10(B)-> 2000(C)

1.544(B)-> 12953(C)

0.768(B)-> 26041(C)

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Kevin Dorrell Thu, 07/17/2008 - 04:43
</p><p>router ospf n</p><p> auto-cost reference-bandwidth 20000</p><p>

Kevin Dorrell


Rupesh Kashyap Thu, 07/17/2008 - 05:07


How you calculated 20000 ( reference Bandw/interface bandw). I want to know what is the base for selecting 20000. Please help

tdrais Thu, 07/17/2008 - 04:43

Not sure the question.

You do not know the command

auto-cost reference-bandwidth 20000

or is there another question?

tdrais Thu, 07/17/2008 - 05:17

The reference bandwidth is in meg

So to get the cost you just divide this number by the bandwidth. Or in your case I just multiplied the cost by the bandwidth.

You had all the calculations correct so figured you knew the 20000 number and had used it for your table.

Edit.... kevin and me agree I guess we jsut post at the same time...

Rupesh Kashyap Thu, 07/17/2008 - 05:40


I have only one question, how you have calculated 20000 from my requirement. Please help.

tdrais Thu, 07/17/2008 - 05:45

You said 10000m would be a cost of 2

So cost = reference bandwidth / interface bandwidth

give 2 = reference bandwidth / 10000

you get reference bandwidth = 2*10000 = 20000


This Discussion