Configuring the Open Shortest Path First Protocol
20-17
20
• Advertise Default Route
22
– The router can advertise a default external route into
the autonomous system (AS). (Options: NotAlways, Always; Default: NotAlways)
• Always – The router will advertise itself as a default external route for the local
AS, even if a default external route does not actually exist. (To define a default
route, see “Configuring Static Routes” on page 19-21.)
• NotAlways – It can only advertise a default external route into the AS if it has
been configured to import external routes through RIP or static routes, and such
a route is known. (See “Redistributing External Routes” on page 20-35.)
• External Metric Type
22
– The external link type used to advertise the default
route. Type 1 route advertisements add the internal cost to the external route
metric. Type 2 routes do not add the internal cost metric. When comparing Type 2
routes, the internal cost is only used as a tie-breaker if several Type 2 routes have
the same cost. (Default: Type 2)
• Default External Metric
22
– The Metric assigned to the default route.
(Range: 1-65535; Default: 10)
The metric for the default external route is used to calculate the path cost for traffic
passed from other routers within the AS out through the ASBR.
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