Chapter 50
| IP Routing Commands
Open Shortest Path First (OSPFv2)
– 1021 –
Command Usage
â—† An area ID uniquely defines an OSPF broadcast area. The area ID 0.0.0.0
indicates the OSPF backbone for an autonomous system. Each router must be
connected to the backbone via a direct connection or a virtual link.
â—† Set the area ID to the same value for all routers on a network segment using the
network mask to add one or more interfaces to an area.
â—† If an address range is overlapped in subsequent network area commands, the
router will use the network area with the address range that most closely
matches the interface address. Also, note that if a more specific address range is
removed from an area, the interface belonging to that range may still remain
active if a less specific address range covering that area has been specified.
Example
This example creates the backbone 0.0.0.0 covering class B addresses 10.1.x.x, and a
normal transit area 10.2.9.0 covering the class C addresses 10.2.9.x.
Console(config-router)#network 10.1.0.0 255.255.0.0 area 0.0.0.0
Console(config-router)#network 10.2.9.0 255.255.255.0 area 10.1.0.0
Console(config-router)#
Interface Configuration
ip ospf authentication This command specifies the authentication type used for an interface. Enter this
command without any optional parameters to specify plain text (or simple
password) authentication. Use the no form to restore the default of no
authentication.
Syntax
ip ospf [ip-address] authentication [message-digest | null]
no ip ospf [ip-address] authentication
ip-address - IP address of the interface. Enter this parameter to specify a
unique authentication type for a primary or secondary IP address
associated with the current VLAN. If not specified, the command applies to
all networks connected to the current interface.
message-digest - Specifies message-digest (MD5) authentication.
null - Indicates that no authentication is used.
Command Mode
Interface Configuration (VLAN)
Default Setting
No authentication
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