Dell Force10 Z9000 FTOS Configuration Guide for Z9000 System - Page 640

www.dell.com | support.dell.com Configure OSPF Stub-Router Advertisement c e Configure OSPF Stub-Router Advertisement is supported on platforms: When you bring a new router onto an OSPF network, you can configure the router to function as a stub area by globally reconfiguring the OSPF link cost so that other routers do not use a path that forwards traffic destined to other networks through the new router for a specified time until the router's switching and routing functions are up and running, and the routing tables in network routers have converged. By using the max-metric router-lsa command, you force the link cost of all OSPF non-stub links to the maximum link cost (65535) for a specified time. The advertisement of this maximum metric causes other routers to assign a cost to the new router that is higher than the cost of using an alternate path. Because of the high cost assigned to paths that pass through the new router, other routers will not use a path through the new router as a transit path to forward traffic to other networks. Use the max-metric router-lsa command to gracefully shut down or reload a router without dropping packets destined for other networks. Command Syntax Command Mode Usage max-metric router-lsa [on-startup {announce-time | wait-for-bgp [wait-time]}] ROUTER OSPF E-Series ExaScale only: Configure the maximum cost of 65535 on a new router so that it always functions as a stub router in the network and OSPF traffic destined to other networks is not routed on paths which pass through the router. on-startup announce-time specifies the time (in seconds) following boot-up during which the maximum cost (65535) for transmitting OSPF traffic on router interfaces is announced in LSAs and the router functions as a stub router. Range: 5 to 86400 seconds. on-startup wait-for-bgp [wait-time] enables the router to announce the maximum metric in OSPF LSAs until the BGP routing table converges with updated routes. Default: 600 seconds. You can also specify the time (in seconds) that the router waits for the BGP routing table to converge before it stops advertising the maximum cost in LSAs and advertises the router's currently configured OSPF cost. Range: 5 to 86400 seconds. Note: If you enter the max-metric router-lsa command without an option (on-startup announce-time or on-startup wait-for-bgp [wait-time]), the maximum metric of 65535 is always announced in LSAs sent by the router. 640 | Open Shortest Path First (OSPFv2 and OSPFv3)