Introduction To Ospf - 3Com MSR 50 Series Configuration Manual

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Introduction to OSPF

OSPF C
Open Shortest Path First (OSPF) is a link state based interior gateway protocol
developed by the OSPF working group of the Internet Engineering Task Force
(IETF). At present, OSPF version 2 (RFC2328) is used.
When configuring OSPF, go to these sections for information you are interested in:
"Introduction to OSPF" on page 917
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"OSPF Configuration Task List" on page 937
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"Configuring OSPF Basic Functions" on page 939
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"Configuring OSPF Area Parameters" on page 940
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"Configuring OSPF Network Types" on page 941
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"Configuring OSPF Routing Information Control" on page 942
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"Configuring OSPF Network Optimization" on page 946
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"Displaying and Maintaining OSPF Configuration" on page 954
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"OSPF Configuration Examples" on page 955
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"Troubleshooting OSPF Configuration" on page 968
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Unless otherwise noted, OSPF refers to OSPFv2 throughout this document.
OSPF has the following features:
Scope: Supports networks of various sizes and can support several hundred
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routers.
Fast convergence: Transmits update packets instantly after network topology
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changes for routing information synchronization in the AS.
Loop-free: Computes routes with the Shortest Path Tree algorithm according to
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the collected link states, so no loop routes are generated.
Area partition: Allows an AS to be split into different areas for ease of
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management and the routing information transmitted between areas is
summarized to reduce network bandwidth consumption.
Equal-cost multi-route: Supports multiple equal-cost routes to a destination.
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Routing hierarchy: Supports a four-level routing hierarchy that prioritizes the
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routes into intra-area, inter-area, external type-1, and external type-2 routes.
Authentication: Supports interface-based packet authentication to guarantee
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the security of packet exchange.
ONFIGURATION