38-32
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 38 Configuring IP Unicast Routing
Configuring OSPF
Use the
no
form of these commands to remove the configured parameter value or to return to the
default value.
Configuring OSPF Area Parameters
You can optionally configure several OSPF area parameters. These parameters include authentication for
password-based protection against unauthorized access to an area, stub areas, and not-so-stubby-areas
(NSSAs).
Stub areas
are areas into which information on external routes is not sent. Instead, the area
border router (ABR) generates a default external route into the stub area for destinations outside the
autonomous system. An NSSA does not flood all LSAs from the core into the area, but can import
autonomous-system external routes within the area by redistribution.
Route summarization consolidates advertised addresses into a single summary route to be advertised by
other areas. If network numbers are contiguous, you can use the
area range
router configuration
command to configure the ABR to advertise a summary route that covers all networks in the range.
Note
The OSPF
area
router configuration commands are all optional.
Beginning in privileged EXEC mode, follow these steps to configure area parameters:
Step 10
ip ospf message digest-key
keyid
md5
key
(Optional) Enable MDS authentication.
•
keyid
—An identifier from 1 to 255.
•
key
—An alphanumeric password of up to 16 bytes.
Step 11
ip ospf database-filter all out
(Optional) Block flooding of OSPF LSA packets to the interface. By
default, OSPF floods new LSAs to all interfaces in the same area
except to the interface on which the LSA arrives.
Step 12
end
Return to privileged EXEC mode.
Step 13
show ip ospf interface
[
interface-name
]
Display OSPF-related interface information.
Step 14
show ip ospf neighbor detail
Display NSF awareness status of neighbor switch. The output
matches one of these examples:
•
Options is 0x52
LLS Options is 0x1 (LR)
When both of these lines appear, the neighbor switch is
NSF-aware.
•
Options is 0x42
—This means the neighbor switch is not
NSF-aware.
Step 15
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
router ospf
process-id
Enable OSPF routing, and enter router configuration mode.
