HP 7102dl Owners Manual - Page 788

IP Routing-Configuring RIP, OSPF, BGP, and PBR Configuring OSPF The refresh interval, which dictates how often routers must send out an LSA, must be such that routers can refresh their databases every 30 minutes. The shortest path first (SPF) delay and hold timers save processing power by preventing a router from continuously calculating new best routes. Table 15-9. Global OSPF Intervals Interval refresh shortest path first (SPF) delay: • calculation delay • SPF hold Meaning Default the maximum time 240 seconds before sending a new LSA • the time between receiving topological changes and beginning SFP calculations • the time between consecutive SFP calculations • 5 seconds • 10 seconds Range 10 to 1,800 seconds (maximum of 30 minutes) • 0 to 4,294,967,295 seconds • 0 to 4,294,967,295 seconds Command Syntax timers lsa-grouppacing timers spf Caution Do not change default intervals unless you have a great deal of experience working with OSPF and understand the implications of the changes. Improperly set intervals can disrupt router processes and congest the network. Configuring OSPF Authentication If you enable authentication on your OSPF network, then routers will not exchange their databases to achieve adjacency until they have authenticated each other with a password. OSPF authentication prevents network devices from inadvertently joining the wrong area. In addition, hackers and malware can send pseudo-OSPF packets to establish a neighbor relationship with the routers on your private network. After this relationship is established, the hackers and the malware writers would receive LSAs and learn valuable information about your network. OSPF authentication ensures that routers on your private network do not accept unauthorized packets. The ProCurve Secure Router supports two types of OSPF authentication: ■ OSPF simple password authentication ■ authentication with MD5 15-62