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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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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 Other OSPF Parameters
You can optionally configure other OSPF parameters from router configuration mode.
•
Route summarization: When redistributing routes from other protocols, as described in the
Route Maps to Redistribute Routing Information” section on page 38-96
, each route is advertised
individually in an external LSA. To help decrease the size of the OSPF link state database, you can
use the
summary-address
router configuration command to advertise a single router for all the
redistributed routes included in a specified network address and mask.
•
Virtual links: In OSPF, all areas must be connected to a backbone area. You can establish a virtual
link in case of a backbone-continuity break by configuring two ABRs as endpoints of a virtual link.
Configuration information includes the identity of the other virtual endpoint (the other ABR) and
the nonbackbone link that the two routers have in common (the transit area). Virtual links cannot be
configured through a stub area.
Step 3
area
area-id
authentication
(Optional) Allow password-based protection against unauthorized
access to the identified area. The identifier can be either a decimal
value or an IP address.
Step 4
area
area-id
authentication message-digest
(Optional) Enable MD5 authentication on the area.
Step 5
area
area-id
stub
[
no-summary
]
(Optional) Define an area as a stub area. The
no-summary
keyword
prevents an ABR from sending summary link advertisements into the
stub area.
Step 6
area
area-id
nssa
[
no-redistribution
]
[
default-information-originate
]
[
no-summary
]
(Optional) Defines an area as a NSSA. Every router within the same
area must agree that the area is an NSSA. Select one of these
keywords:
•
no-redistribution
—Select when the router is an NSSA ABR and
you want the
redistribute
command to import routes into normal
areas but not into the NSSA.
•
default-information-originate
—Select an ABR to allow
importing type 7 LSAs into the NSSA.
•
no-redistribution
—Select to not send summary LSAs into the
NSSA.
Step 7
area
area-id
range
address mask
(Optional) Specify an address range for which a single route is
advertised. Use this command only with area border routers.
Step 8
end
Return to privileged EXEC mode.
Step 9
show ip ospf
[
process-id
]
show ip ospf
[
process-id
[
area-id
]]
database
Display information about the OSPF routing process in general or for
a specific process ID to verify configuration.
Display lists of information related to the OSPF database for a
specific router.
Step 10
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
