IBM RackSwitch G8000, Инструкция по применению

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© Copyright IBM Corp. 2011 Chapter 22. OSPF
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OSPFv2 Implementation in IBM N/OS
N/OS supports a single instance of OSPF and up to 4K routes on the network. The
following sections describe OSPF implementation in N/OS:
•
“Configurable Parameters” on page 261
• “Defining Areas” on page 262
• “Interface Cost” on page 264
• “Electing the Designated Router and Backup” on page 264
• “Summarizing Routes” on page 264
• “Default Routes” on page 265
• “Virtual Links” on page 266
• “Router ID” on page 266
• “Authentication” on page 267
Configurable Parameters
In N/OS, OSPF parameters can be configured through the Command Line
Interfaces (CLI/ISCLI), Browser-Based Interface (BBI), or through SNMP. For more
information, see “Switch Administration” on page 23 .
The ISCLI supports the following parameters: interface output cost, interface
priority, dead and hello intervals, retransmission interval, and interface transmit
delay.
In addition to the preceding parameters, you can specify the following:
•
Shortest Path First (SPF) interval—Time interval between successive
calculations of the shortest path tree using the Dijkstra’s algorithm.
• Stub area metric—A stub area can be configured to send a numeric metric value
such that all routes received via that stub area carry the configured metric to
potentially influence routing decisions.
• Default routes—Default routes with weight metrics can be manually injected into
transit areas. This helps establish a preferred route when multiple routing
devices exist between two areas. It also helps route traffic to external networks.
• Passive—When enabled, the interface sends LSAs to upstream devices, but
does not otherwise participate in OSPF protocol exchanges.
• Point-to-Point—For LANs that have only two OSPF routing agents (the G8000
and one other device), this option allows the switch to significantly reduce the
amount of routing information it must carry and manage.