Virtual Private Routed Network Service536FD 100/320Gbps NT and FX NT IHub Services Guide3HH-11985-AAAA-TQZZA Issue: 137.10.10.28 external-db-overflowTable 565 external-db-overflow command7.10.10.29 external-preferenceTable 566 external-preference commandItem DescriptionSyntax external-db-overflow limit intervalno external-db-overflowContext configure>service>vprn>ospfDescription This command enables limits on the number of non-default AS-external-LSA entries that canbe stored in the LSDB and specifies a wait timer before processing these after the limit isexceeded.The limit value specifies the maximum number of non-default AS-external-LSA entries that canbe stored in the link-state database (LSDB). Placing a limit on the non-defaultAS-external-LSAs in the LSDB protects the router from receiving an excessive number ofexternal routes that consume excessive memory or CPU resources. If the number of routesreach or exceed the limit, the table is in an overflow state. When in an overflow state, the routerwill not originate any new AS-external-LSAs. In fact, it withdraws all the self-originatednon-default external LSAs.The interval specifies the amount of time to wait after an overflow state before regeneratingand processing non-default AS-external-LSAs. The waiting period acts like a dampeningperiod preventing the router from continuously running Shortest Path First (SPF) calculationscaused 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 OSPFarea. 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-LSAentries.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 theLSDB before going into an overflow state expressed as a decimal integer.Values: -1 — 2147483647interval — The number of seconds after entering an overflow state before attempting toprocess non-default AS-external-LSAs expressed as a decimal integer.Values: 0 — 2147483647Item DescriptionSyntax external-preference preferenceno external-preferenceContext configure>service>vprn>ospf(1 of 2)
