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Implementing OSPF on Cisco IOS XR Software
How to Implement OSPF on Cisco IOS XR Software
RC-198
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Step 4
area area-id
Example:
RP/0/RP0/CPU0:router(config-ospf)# area 1
Enters area configuration mode and configures a
nonbackbone area for the OSPF process.
• The area-id argument can be entered in dotted-decimal
or IPv4 address notation, such as area 1000 or
area 0.0.3.232. However, you must choose one form or
the other for an area. We recommend using the IPv4
address notation.
Step 5
stub [no-summary]
or
nssa [no-redistribution]
[default-information-originate] [no-summary]
Example:
RP/0/RP0/CPU0:router(config-ospf-ar)# stub no
summary
or
RP/0/RP0/CPU0:router(config-ospf-ar)# nssa
no-redistribution
Defines the nonbackbone area as a stub area.
• See the “Configuring Stub and Not-So-Stubby Area
Types” section on page RC-197.
• Specify the no-summary keyword to further reduce the
number of LSAs sent into a stub area. This keyword
prevents the ABR from sending summary link-state
advertisements (Type 3) in the stub area.
or
Defines an area as an NSSA.
• See the “Configuring Stub and Not-So-Stubby Area
Types” section on page RC-197.
Step 6
stub
or
nssa
Example:
RP/0/RP0/CPU0:router(config-ospf-ar)# stub
or
RP/0/RP0/CPU0:router(config-ospf-ar)# nssa
(Optional) Turns off the options configured for stub and
NSSA areas.
• If you configured the stub and NSSA areas using the
optional keywords (no-summary, no-redistribution,
default-information-originate, and no-summary) in
Step 5, you must now reissue the stub and nssa
commands without the keywords—rather than using
the no form of the command.
• For example, the no nssa
default-information-originate form of the command
changes the NSSA area into a normal area that
inadvertently brings down the existing adjacencies in
that area.
Step 7
default-cost cost
Example:
RP/0/RP0/CPU0:router(config-ospf-ar)#
default-cost 15
(Optional) Specifies a cost for the default summary route
sent into a stub area or an NSSA.
• Use this command only on ABRs attached to the NSSA.
Do not use it on any other routers in the area.
• The default cost is 1.
Command or Action Purpose