VPRN Service Configuration Commands
Page 836 7210 SAS-X OS Services Guide
The interval specifies the amount of time to wait after an overflow state before regenerating and
processing non-default AS-external-LSAs. The waiting period acts like a dampening period
preventing the router from continuously running Shortest Path First (SPF) calculations caused by the
excessive number of non-default AS-external LSAs.
The external-db-overflow must be set identically on all routers attached to any regular OSPF area.
OSPF stub areas and not-so-stubby areas (NSSAs) are excluded.
The no form of the command disables limiting the number of non-default AS-external-LSA entries.
Default no external-db-overflow — No limit on non-default AS-external-LSA entries.
Parameters limit — The maximum number of non-default AS-external-LSA entries that can be stored in the
LSDB before going into an overflow state expressed as a decimal integer.
Values -1 — 2147483647
interval — The number of seconds after entering an overflow state before attempting to process non-
default AS-external-LSAs expressed as a decimal integer.
Values 0 — 2147483647
external-preference
Syntax external-preference preference
no external-preference
Context config>service>vprn>ospf
Description This command configures the preference for OSPF external routes.
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 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 external-preference 150 — OSPF external routes have a default preference of 150.
Parameters preference — The preference for external routes expressed as a decimal integer.
Route Type Preference Configurable
Direct attached 0 No
Static routes 5 Yes
OSPF internal 10
Yes
a
IS-IS level 1 internal 15 Yes
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