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212 | Chapter 4. Routing
ProSafe® Gigabit L3 Managed Stackable Switches Software Administration Manual
Route Preferences
Use this panel to configure the default preference for each protocol, e.g., 60 for static routes,
120 for RIP. These values are arbitrary values in the range of 1 to 255 and are independent of
route metrics. Most routing protocols use a route metric to determine the shortest path known
to the protocol, independent of any other protocol.
The best route to a destination is chosen by selecting the route with the lowest preference
value. When there are multiple routes to a destination, the preference values are used to
determine the preferred route. If there is still a tie, the route with the best route metric will be
chosen. To avoid problems with mismatched metrics (i.e., RIP and OSPF metrics are not
directly comparable) you must configure different preference values for each of the protocols.
To display the Route Preferences page, click Routing
Routing Table Advanced Route
Preferences.
1. Use Static to specify the static route preference value in the router. The default value is
1. The range is 1 to 255.
2. Use RIP to specify the RIP route preference value in the router. The default value is 120.
The range is 1 to 255.
3. Use OSPF Intra to specify the OSPF intra route preference value in the router. The default
value is 110. The range is 1 to 255. The OSPF specification (RFC 2328) requires that
preferences must be given to the routes learned via OSPF in the following order: intra < inter
< type-1 < type-2.
4. Use OSPF Inter to specify the OSPF inter route preference value in the router. The default
value is 110. The range is 1 to 255. The OSPF specification (RFC 2328) requires that
preferences must be given to the routes learned via OSPF in the following order: intra < inter
< type-1 < type-2.
5. Use OSPF External to specify the OSPF external route preference value in the router. The
default value is 110. The range is 1 to 255. The OSPF specification (RFC 2328) requires that
preference value must be the same for all the OSPF external route types like
type1/type2/nssa1/nssa2.
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