Therefore, the default cost of a 10-Mbps Ethernet link will be 108 / 107 = 10, and
the cost of a T1 link will be 108 / 1,544,000 = 64.
To adjust the reference bandwidth for links with bandwidths greater than FastEthernet, use the
ospf auto-cost reference-bandwidth ref-bw command con?¬?gured in the OSPF routing process
con?¬?guration mode.
Con?¬?guring and Verifying OSPF
The router ospf command uses a process identi?¬?er as an argument. The process ID is a unique,
arbitrary number that you select to identify the routing process. The process ID does not need to
match the OSPF process ID on other OSPF routers.
The network command identi?¬?es which IP networks on the router are part of the OSPF network.
For each network, you must also identify the OSPF area to which the networks belong. The
network command takes the three arguments listed in Table 4-1. The table de?¬?nes the parameters
of the network command.
Router A
Router B
Router C
Router D 10
10
0
5
5
10
5
222.211.10.0
128.213.0.0
192.213.11.0
Introducing OSPF 145
Calculating wildcard masks on non-8-bit boundaries can be prone to error. You can avoid
calculating wildcard masks by having a network statement that matches the IP address on each
interface and uses the 0.
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