ASBR Without Valid Area

jskfan
jskfan used Ask the Experts™
on
ASBR Without Valid Area

I have noticed when I redistribute connected subnets  on OSPF Stub Area I get the message below :

R3(config-router)#redistribute connected subnets
R3(config-router)#
*May 20 21:12:59.726: %OSPF-4-ASBR_WITHOUT_VALID_AREA: Router is currently an ASBR while having only one area which is a stub area

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However OSPF will still take that command as shown below:

R3#sh run | sec ospf
router ospf 1
 area 1 stub
 redistribute connected subnets
 network 192.168.23.0 0.0.0.255 area 1
R3#

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So any one can explain the meaning of that message ?

Thank you
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atlas_shudderedSr. Network Engineer

Commented:
Stub area won't flood LSA 4 or 5.  If you want these to be flooded you will need to convert to NSSA.

Author

Commented:
*May 20 21:12:59.726: %OSPF-4-ASBR_WITHOUT_VALID_AREA: Router is currently an ASBR while having only one area which is a stub area

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The above message will show just when you configure "redistribute connected subnets"  on a router in Stub area, or it will also show when you configure it in Totally Stub and Totally NSSA  ?

I also believe LSA type 4 and 5 are blocked in Stub, Totally Stub , NSSA, Totally NSSA
atlas_shudderedSr. Network Engineer

Commented:
If you configure as a NSSA I know the error will clear.  In a Stub or t-Stub it will be present when you attempt to redistribute because you are bringing in external routes.  On a t-NSSA, I am not sure.
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Distinguished Expert 2018

Commented:
I also believe LSA type 4 and 5 are blocked in Stub, Totally Stub , NSSA, Totally NSSA
Correct, that's why in NSSA LSA type 7 will be created to inject routs into NSSA/totally NSSA,

Author

Commented:
This message "*May 20 21:12:59.726: %OSPF-4-ASBR_WITHOUT_VALID_AREA: Router is currently an ASBR while having only one area which is a stub area"

will show when you redistribute routes into Stub and Totally NSSA, but the if you go to Running Configuration , you will still be able to see " Redistribute Connected Subnets"
So it is there, but does not in fact redistribute the routes
Distinguished Expert 2018
Commented:
That message will NOT appear when routes are redistributed into NSSA or totally NSSA. And will distribute route into those area types.

Message is there because stub and totally stub area do not support external route (either E or N type) and route can't be redistributed into that area type.

Author

Commented:
I will Lab it again later
Thank you for your help

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