Different routing protocols including the static routing may learn different routes to the same destination, but not all these routes are optimal. At a certain moment, only one routing protocol determines the current route to a certain destination. Therefore, each of these routing protocols including the static routing has a preference. When multiple routing information sources are available, the route learned by the routing protocol with the highest preference is used. The smaller the default value, the higher the preference, as shown in Table 1.
Table 1 Preferences of routing protocols
Routing Protocol or Route Type
Route Preference
DIRECT
0
OSPF
10
IS-IS
15
STATIC
60
RIP
100
OSPF ASE
150
OSPF NSSA
150
IBGP
255
EBGP
255
UNKNOWN
256
0 indicates a direct route and 255 indicates a route learned from an unreliable source.
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