09-19-2012 10:04 PM - edited 03-07-2019 08:58 AM
Hello,
I found the following scenarium:
Our customer has on ots core switches two ospf processes running.
One ospf process injects a default route. This default route should also redistributed into the other process. And therefore inject into te second backbone area.
The command "sh ip ospf process <1> database shows the o.o.o.o route
After redistribution :
Redistribute ospf 1 subnets metric-type 1
The default isn't in the second ospf database?! All other routes are redistributed?!
Any idea?
Thanks
Udo
Sent from Cisco Technical Support iPad App
09-19-2012 10:10 PM
Hi Udo,
You can not redistribute a default route into OSPF, at least in Cisco's OSPF implementation. OSPF on Cisco devices specifically avoids redistributing the default route into OSPF. The only way to inject a default route into OSPF is to use the default-information originate command in the appropriate OSPF process.
Best regards,
Peter
09-20-2012 06:08 AM
Thank you Peter...
That is what I also thought...but please can you tell me where I can read this ? RFC ?!
Udo
Sent from Cisco Technical Support iPad App
09-20-2012 06:33 AM
here is a cisco link on the default info ori and default route
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801ec9f0.shtml
09-20-2012 06:45 AM
Hello Udo,
This behavior is not specified in any RFC to my best knowledge. It is an implementation choice made by Cisco. However, the following document
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml#route0.0
specifically states:
The default routes created using the ip route 0.0.0.0 0.0.0.0 command are not propagated by OSPF and IS-IS. Additionally, this default cannot be redistributed into OSPF or IS-IS using the redistribute command. Use the default-information originate command to generate a default route into an IS-IS or OSPF routing domain. For more detailed information on behavior of default routes with OSPF, refer to How Does OSPF Generate Default Routes?
Best regards,
Peter
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: