Nokia 7330 - Table 565 External-Db-Overflow Command; Table 566 External-Preference Command

Virtual Private Routed Network Service
536
FD 100/320Gbps NT and FX NT IHub Services Guide
3HH-11985-AAAA-TQZZA Issue: 13
7.10.10.28 external-db-overflow
Table 565 external-db-overflow command
7.10.10.29 external-preference
Table 566 external-preference command
Item Description
Syntax external-db-overflow limit interval
no external-db-overflow
Context configure>service>vprn>ospf
Description This command enables limits on the number of non-default AS-external-LSA entries that can
be stored in the LSDB and specifies a wait timer before processing these after the limit is
exceeded.
The limit value specifies the maximum number of non-default AS-external-LSA entries that can
be stored in the link-state database (LSDB). Placing a limit on the non-default
AS-external-LSAs in the LSDB protects the router from receiving an excessive number of
external routes that consume excessive memory or CPU resources. If the number of routes
reach or exceed the limit, the table is in an overflow state. When in an overflow state, the router
will not originate any new AS-external-LSAs. In fact, it withdraws all the self-originated
non-default external LSAs.
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
Item Description
Syntax external-preference preference
no external-preference
Context configure>service>vprn>ospf
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