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Routing Priority
OSPF areas receive routes based on priority. Table 11 describes the routing priority.
Table 11: Routing
Priority
|
Priority
|
Type
|
Description
|
|
1 (highest)
|
Intra-area
|
Intra-area routing. Refers to routing within a single
OSPF area.
|
|
2
|
Interarea
|
Interarea routing. Refers to routing between OSPF areas within
a single OSPF routing domain.
|
|
3
|
External
|
External type 1. Refers to routing from other protocols that
can be imported into the OSPF domain and readvertised by OSPF as type
1 external.
Type 1 metric is comparable to the link-state metric; the cost
is equal to the sum of the internal costs plus the external cost.
|
|
4 (lowest)
|
External
|
External type 2. Refers to routing from other protocols that
can be imported into the OSPF domain and readvertised by OSPF as type
2 external.
Type 2 metric is much larger than the cost of any intra-AS path;
the cost is equal to the external cost. This is the OSPF default.
|
If you use the redistribute command to import routes from other protocols or sources, the routes
default to external type 2. You can specify a route map with the redistribute command to modify the type. Alternatively,
you can use the metric-type keyword with
the redistribute command to specify the
type.
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