do we simply set the reference bw to 10000 Mbps? this set's it at 10Gbps correct, as the bw is defined as Mbps.
OSPF Auto Cost Reference Bandwidth
Scenario:
The new muppet movie is almost finished. All the actresses prefer to have a dedicated internet connection in their trailers at the movie park. You configure a couple of routers with Gigabit and FastEthernet interfaces. Unfortunately OSPF doesn't seem to make a difference between FastEthernet and Gigabit links. It's up to you to make the changes so it does see a difference...
Goal:
- All IP addresses have been preconfigured for you.
- Configure OSPF on all routers. Achieve full connectivity.
- Without changing the OSPF cost on each interface, ensure OSPF will make the best use of the Gigabit interfaces. In the future you will also add some ten Gigabit links so this is something to be aware of.
IOS:
c7200-adventerprisek9-mz.124-20.T.bin
Topology:
Video Solution:
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Comments (2)
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ReneMolenaar 2011-09-26 23:04:34Yup that's it. By default OSPF will use a 100mbit interface for the reference bandwidth. That means a 100mbit interfaces gets a cost of 1. (100 / 100 = 1).
You can't have a cost of 0,1 for Gigabit or 0,01 for 10Gigabit. That's why you need to change the reference bandwidth.
If you get it to 10Gigabit then it'll look like this:
10Gigabit: Cost 1
Gigabit: Cost 10
100Mbit: Cost 100