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7/27/2019 chapter 3, continue.docx
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Configuring Stub Area
area area-id stub
area area-id default-cost cost router configuration command on the ABR to change the cost of the
default route. The default cost is 1.
Default route is automatically advertised.
Configuring Totally Stubby Areas
area area-id stub router configuration command
area area-id stub no-summary at the ABR router.
area area-id default-cost cost command to change the cost.
Configuring NSSAs
summary-address address if needed to redistribute something.
area area-id nssa [no-redistribution] [default-information-originate] [metric metric-value] [metric-
type type-value] [no-summary] router configuration command. The no-summary keyword is used only
on the ABR for totally stubby NSSA areas, not just NSSAs.
no-redistribution - When the router is an NSSA ABR and it imports routes only into the standard areas.
but not into the NSSA area.
metric type - type 1 or type 2
Configuring Totally Stubby NSSAs
summary-address address if needed to redistribute something.
area area-id nssa [no-redistribution] [default-information-originate] [metric metric-value] [metric-
type type-value] [no-summary] router configuration command. The no-summary keyword is used only
on the ABR. The ABR automatically generates O*N2 default routes, sp there is no need to use the
default-information-originate parameter.
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The ABR for stub and totally stubby areas generates a summary LSA with the link-
state ID 0.0.0.0, so there is no need to use the default-information-originate
command.
The ABR for NSSA does not generate a default route by default. To make itgenerate the default route, use the default-information-originate parameter in
the area area-id nssa command.
The ABR for totally stubby NSSAs automatically generates a default route.
Verify Area Types
show ip ospf - OSPF information: which areas are standard, stub ot NSSA
show ip ospf database - details of LSAs
show ip ospf database nssa-external - specific details of each LSA type 7 update in the database
show ip route
Configure Simple Password Authentication
ip ospf authentication-key password interface configuration command to assign a key.
To hide the password using encryption type 7, use the service password-authentication command.
ip ospf authentication [message-digest | null] interface configuration command. To use simple
password authentication, use the command without any parameters.
If authentication is required on an area, not an interface, use:
area area-id authentication [message-digest] router configuration command.
To verify simple password, use:
show ip ospf interface to see if simple password is enabled
show ip ospf neighbor to see if an adjacency is formed
To configure simple password for a virtual link, use:
area area-id authentication router configuration command to use authentication for the whoe area
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area area-id virtual-link router-id (of the end-side router) authentication-key key command.
Configure OSPF MD5 Authentication
ip ospf message-digest-key key-id md5 key interface configuration command. The key ID can range
from 1 to 255.
ip ospf authentication message-digest interface configuration command.