H3C Technologies H3C S12500-X Series Switches - Manual (Page 83)

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Step Command Remarks
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable an OSPF process on
the interface.
ospf process-id area area-id
[ exclude-subip ]
By default, OSPF is disabled on an
interface.
If the specified OSPF process and area do
not exist, the command creates the OSPF
process and area. Disabling an OSPF
process on an interface does not delete the
OSPF process or the area.
45B
Configuring OSPF areas
Before you configure an OSPF area, complete the following tasks:
• Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
• Enable OSPF.
190B
Configuring a stub area
You can configure a non-backbone area at an AS edge as a stub area. To do so, issue the stub command
on all routers attached to the area. The routing table size is reduced because Type-5 LSAs will not be
flooded within the stub area. The ABR generates a default route into the stub area so all packets destined
outside of the AS are sent through the default route.
To further reduce the routing table size and routing information exchanged in the stub area, configure a
totally stub area by using the stub [ no-summary ] command on the ABR. AS external routes and
inter-area routes will not be distributed into the area. All the packets destined outside of the AS or area
will be sent to the ABR for forwarding.
A stub or totally stub area cannot have an ASBR because external routes cannot be distributed into the
area.
To configure an OSPF stub area:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
N/A
3. Enter area view. area area-id N/A
4. Configure the area as a stub
area.
stub
[ default-route-advertise-always
| no-summary ] *
By default, no stub area is configured.
5. (Optional.) Specify a cost
for the default route
advertised to the stub area.
default-cost cost
The default setting is 1.
The default-cost cost command takes
effect only on the ABR of a stub area or
totally stub area.