© Copyright Lenovo 2016 Chapter 35: Open Shortest Path First 559OSPFv2 Implementation in Enterprise NOSENOS supports a single instance of OSPF and up to 4K routes on the network. Thefollowing sections describe OSPF implementation in ENOS: “Configurable Parameters” on page 559 “Defining Areas” on page 560 “Interface Cost” on page 562 “Electing the Designated Router and Backup” on page 562 “Summarizing Routes” on page 562 “Default Routes” on page 563 “Virtual Links” on page 563 “Router ID” on page 564 “Authentication” on page 565Configurable ParametersIn ENOS, OSPF parameters can be configured through the Industry StandardCommand Line Interfaces (ISCLI), Browser‐Based Interface (BBI), or throughSNMP. For more information, see Chapter 1, “Switch Administration.”The ISCLI supports the following parameters: interface output cost, interfacepriority, dead and hello intervals, retransmission interval, and interface transmitdelay.In addition to the preceding parameters, you can specify the following: Shortest Path First (SPF) interval—Time interval between successive calculationsof the shortest path tree using the Dijkstra’s algorithm. Stub area metric—A stub area can be configured to send a numeric metric valuesuch that all routes received via that stub area carry the configured metric topotentially influence routing decisions. Default routes—Default routes with weight metrics can be manually injectedinto transit areas. This helps establish a preferred route when multiple routingdevices exist between two areas. It also helps route traffic to external networks. Passive—When enabled, the interface sends LSAs to upstream devices, but doesnot otherwise participate in OSPF protocol exchanges. Point‐to‐Point—For LANs that have only two OSPF routing agents (the G8264and one other device), this option allows the switch to significantly reduce theamount of routing information it must carry and manage.
