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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
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As shown above, Local will always be the first choice for routing purposes and the next most reliable path is Static due to the fact
that its has the next lowest value. To set a higher reliability for a route, change its value to a number less than the value of a route
preference that has a greater reliability value using the New Route Preference Settings window command. For example, if the
user wishes to make RIP the most reliable route, the user can change its value to one that is less than the lowest value (Static - 60)
or the user could change the other route values to more than 100.
The user should be aware of three points before configuring the route preference:
1. No two route preference values can be the same. Entering the same route preference may cause the Switch to crash due
to indecision by the Switch.
2. If the user is not fully aware of all the features and functions of the routing protocols on the Switch, a change in the
default route preference value may cause routing loops or black holes.
3. After changing the route preference value for a specific routing protocol, that protocol needs to be restarted because
the previously learned routes have been dropped from the switch. The Switch must learn the routes again before the new settings
can take affect.
To view the Route Preference Settings window, click L3 Features > Route Preference Settings:
Figure 8- 10. Route Preference Settings window
Route Type Validity Range Default Value
Local 0 - Permanently set on the Switch and not configurable. 0
Static 1 - 999 60
OSPF Intra 1 - 999 80
OSPF Inter 1 - 999 90
RIP 1 - 999 100
OSPF ExtT1 1 - 999 110
OSPF ExtT2 1 - 999 115