Dell PowerConnect 8100 CLI Reference Guide - Page 1241

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. If the router is configured to enter stub router mode on startup (max-metric router-lsa on-startup), and one then enters max-metric router lsa, there is no change. If OSPF is administratively in stub router mode (the max-metric router-lsa command has been given), and one configures OSPF to enter stub router mode on startup (max-metric router-lsa on-startup), OSPF exits stub router mode (assuming the startup period has expired) and the configuration is updated. The command no max-metric router-lsa clears either type of stub router mode (always or on-startup) and resets the summary-lsa option. If OSPF is configured to enter global configuration mode on startup, and during normal operation one wants to immediately place OSPF in stub router mode, one may issue the command no max-metric router-lsa on-startup. The command no max-metric router-lsa summary-lsa causes OSPF to send summary LSAs with metrics computed using normal procedures defined in RFC 2328. maximum-paths Use the maximum-paths command in Router OSPF Configuration mode to set the number of paths that OSPF can report for a given destination. Use the no form of the command to reset the number to the default value. OSPF Commands 1241