In OSPF or ISIS, When I "show ip ospf border-router"there is SPF value at the end of each line. anybody can tell me how to calculate that?for example, i 192.168.1.1 [1626] via 192.1.40.1, serial 3, ABR/ASBR, Area 0, SPF 8i 192.168.1.1 [74] via 192.1....