C
HAPTER
20
| Unicast Routing
Configuring the Open Shortest Path First Protocol (Version 2)
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◆ Protocol Type – Specifies the external routing protocol type for which
routing information is to be redistributed into the local routing domain.
(Options: RIP, Static; Default: RIP)
◆ Metric Type – Indicates the method used to calculate external route
costs. (Options: Type 1, Type 2; Default: Type 1)
Metric type specifies the way to advertise routes to destinations outside
the autonomous system (AS) through External LSAs. Specify Type 1 to
add the internal cost metric to the external route metric. In other
words, the cost of the route from any router within the AS is equal to
the cost associated with reaching the advertising ASBR, plus the cost of
the external route. Specify Type 2 to only advertise the external route
metric.
◆ Metric – Metric assigned to all external routes for the specified
protocol. (Range: 1-65535: Default: 10)
The metric value specified for redistributed routes supersedes the
Default External Metric specified in the Routing Protocol > OSPF >
System screen (page 507).
◆ Tag – A tag placed in the AS-external LSA to identify a specific external
routing domain, or to pass additional information between routers.
(Range: 0-4294967295)
A tag can be used to distinguish between routes learned from different
external autonomous systems (other routing protocols). For example, if
there are two ASBRs in a routing domain: A and B. ASBR A can be
configured to redistribute routes learned from RIP domain 1 (identified
by tag 1) and ASBR B can redistribute routes learned from RIP domain
2 (identified by tag 2).
WEB INTERFACE
To configure the router to import external routing information:
1. Click Routing Protocol, OSPF, Redistribute.
2. Select Add from the Action list.
3. Specify the process ID, the protocol type to import, the metric type,
path cost, and optional tag.
4. Click Apply.
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