Mid-low end router AR2811 and AR26XX of C enterprise are connected through serial link (the topology can be referred to the attachment). After OSPF is enabled, the route from site two AR2811 to the site AR2831 chooses farther one (arrow direction in the attachment).
1. Farther path is chosen through tracert command.
2. Check routing table and the cost is 1664.
3. Down site two S0. Check routing table and the cost is 3125.
4. The default cost of our device is too large.
The default interface baud rate of sync serial link of our device is 64kbps, but the baud rate of C enterprise is 2M by default. For OSPF, the amount of cost of farther paths is smaller than that of nearer ones and OSPF route selection is based on cost, So farther route is selected. (COST can be referred to the attachment.)
VRP is the same as IOS. When the link interface does not configure OSPF COST, COST is basic value divided by bandwidth. The default basic value is 100M.