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ManualsBrandsHP ManualsNetwork HardwareHP 5412R zl2 Switch

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You can enter a value for the OSPF area in the

format of an IP address or a number in the

range 0 to 4,294,967,295.

Example:

To assign user-defined loopback interface 3 on the switch to area 192.5.0.0 and

include the loopback IP address 172.16.112.2 in the OSPF broadcast area, enter

the following commands:

HP Switch(config)# interface loopback 3

HP Switch(lo-3)# ip ospf 172.16.112.2 area 192.5.0.0

Syntax:

interface loopback 0-7# ip ospf lo-ip-address cost number

Executed in a specific loopback context to modify the cost used to advertise the

loopback address (and subnet) to the area border router (ABR.) Requires that the

specified loopback interface is already configured with an IP address on the switch.

loopback interface 0-7 Defines the loopback context for executing the

cost assignment.

ip ospf lo-ip-address Specifies the loopback interface by its IP

address.

cost number Specifies a number that represents the

administrative metric associated with the

loopback interface. Valid values are from 1 to

65535.

Default: 1.

Example

To configure a cost of 10 for advertising the IP address 172.16.112.2 configured

for loopback interface 3 in an OSPF area 192.5.0.0, enter the following commands:

HP Switch(config)# interface loopback 3

HP Switch(lo-3)# ip ospf 172.16.112.2 area 192.5.0.0

HP Switch(lo-3)# ip ospf 172.16.112.2 cost 10

OSPF redistribution of loopback addresses

When you assign a loopback address to an OSPF area, the route redistribution of the loopback

address is limited to the specified area.

When route redistribution is enabled:

• The switch advertises a loopback IP address that is not assigned to an OSPF area as an OSPF

external route to its OSPF neighbors, and handles it as a connected route.

• The switch advertises a loopback address that is assigned to an OSPF area as an OSPF internal

route.

To enable redistribution of loopback IP addresses in OSPF, enter the redistribution

connected command as described in “Enabling route redistribution” (page 149).

Assigning the routing switch to OSPF areas 147