Fixed Switch Configuration Guide 22-1
22
Configuring OSPFv2
This chapter gives a brief overview of OSPFv2 and then presents several configuration scenarios.
OSPFv2 is available only on those fixed switch platforms that support advanced routing and on
which an advanced feature license has been enabled.
OSPF Overview
The Open Shortest Path First (OSPF) routing protocol is considered a TCP/IP internet routing
Interior Gateway Protocol (IGP). OSPF distributes routing information between routers belonging
to a single Autonomous System (AS). The OSPF protocol gathers link state information from
available neighboring routers and constructs a topology map of the network. It then determines
the shortest path for each route using a “shortest path first” algorithm.
The advantages associated with a link-state routing protocol are:
• Rapid convergence
• Reduced routing updates traffic over traditional distance-vector protocols
• Hierarchical segmentation
• Route summarization and aggregation, which are needed to handle large and complicated
networks
This OSPF implementation supports RFC 2328 OSPF Version 2.
Note: OSPF is an advanced routing feature that must be enabled with a license key. If you have
purchased an advanced license key, you must activate your license as described in the chapter
entitled “Activating Licensed Features” in order to enable the OSPF command set. If you wish to
purchase an advanced routing license, contact Enterasys Networks Sales.
For information about... Refer to page...
OSPF Overview 22-1
Basic OSPF Topology Configuration 22-3
Configuring OSPF Areas 22-8
Configuring OSPF Interfaces 22-15
Default Settings 22-16
Configuration Procedures 22-17
Note: The fixed switch firmware also provides a command to implement RFC 1583 compatibility.
RFC 1583 used a method to calculate metrics for summary routes that is different from the method
specified in RFC 2328. In order to avoid the problem of sub-optimal routing in networks where not
all routers have been upgraded to RFC 2328 implementations, you can make OSPF compatible
with RFC 1583 with the router mode command 1583compatibility.
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