Virtual Private Routed Network Services
7750 SR OS Services Guide Page 1407
A route can be learned by the router from different protocols in which case the costs are not
comparable, when this occurs the preference is used to decide to which route will be used.
Different protocols should not be configured with the same preference, if this occurs the tiebreaker is
per the default preference table as defined in the following table. If multiple routes are learned with
an identical preference using the same protocol, the lowest cost route is used.
If multiple routes are learned with an identical preference using the same protocol and the costs
(metrics) are equal, then the decision of what route to use is determined by the configuration of the
ecmp in the config>router context.
The no form of the command reverts to the default value.
Default preference 10 — OSPF internal routes have a preference of 10.
Parameters preference — The preference for internal routes expressed as a decimal integer. Defaults for different
route types are listed in the following table.
Values 1 — 255
reference-bandwidth
Syntax reference-bandwidth reference-bandwidth
no reference-bandwidth
Context config>service>vprn>ospf
config>service>vprn>ospf3
Description This command configures the reference bandwidth in kilobits per second (Kbps) that provides the
reference for the default costing of interfaces based on their underlying link speed.
Route Type Preference Configurable
Direct attached
0No
Static routes
5Yes
OSPF internal
10
Yes
a
a. Preference for OSPF internal routes is configured with the preference command.
IS-IS level 1 internal
15 Yes
IS-IS level 2 internal
18 Yes
RIP
100 Yes
OSPF external
150 Yes
IS-IS level 1 external
160 Yes
IS-IS level 2 external
165 Yes
BGP
170 Yes
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