Dell N3200-ON Networking N-Series Switches CLI Reference Guide version 6.8.0 - Page 1775

Syntax max-metric router-lsa [on-startup seconds] [summary-lsa {metric}] no max-metric router-lsa [on-startup] [summary-lsa] • on-startup-(Optional) OSPF starts in stub router mode after a reboot. • seconds-(Required if on-startup) The number of seconds that OSPF remains in stub router mode after a reboot. The range is 5 to 86,400 seconds. There is no default value. • summary-lsa-(Optional) Set the metric in type 3 and 4 summary LSAs to LsInfinity (0xFFFFFF). • metric-(Optional) Metric to send in summary LSAs when in stub router mode. Range is 1 to 16,777,215. Default is 16,711,680 (0xFF0000). Default Configuration By default, OSPF is not in stub router mode. Command Mode OSPFv2 Global Configuration mode User Guidelines When OSPF is in stub router mode, as defined by RFC 3137, OSPF sets the metric in the non-stub links in its router LSA to LsInfinity. Other routers therefore compute very long paths through the stub router, and prefer any alternate path. Doing so eliminates all transit traffic through the stub router, when alternate routes are available. Stub router mode is useful when adding or removing a router from a network or to avoid transient routes when a router reloads. One can administratively force OSPF into stub router mode. OSPF remains in stub router mode until OSPF is taken out of stub router mode. Alternatively, one can configure OSPF to start in stub router mode for a specific period of time after the router boots up. If the summary LSA metric is set to 16,777,215, other routers will skip the summary LSA when they compute routes. Layer 3 Routing Commands 1775