09-30-2014 07:21 AM - edited 03-05-2019 06:53 AM
Attached is a network diagram.
I want to setup OSPF throughout and also advertise a default route. The ISP that provides private MPLS runs BGP and will redistribute all OSPF routes to the PE routers (PE1, PE2, PE3, and PE4). I cannot configure the PE routers but will configure the core switches and the ASA1.
I don’t have an issue configuring OSPF but I am unsure on the AREA 0 through MPLS/BGP.
Here is the OPSF configuration I was going to put in place. Anything I missed or don't need or do differently?
Site 1 core switch
Router ospf 1
Network 10.10.0.0 255.255.255.0 area 0
Network 10.20.0.0 255.255.255.0 area 0
Network 10.30.0.0 255.255.255.0 area 0
redistribute static subnets
redistribute connected subnets
**************************************
Site 2 core switch
Router ospf 1
Network 192.168.32.0 255.255.255.0 area 0
Network 192.168.33.0 255.255.255.0 area 0
Network 192.168.132.0 255.255.255.0 area 0
redistribute static subnets
redistribute connected subnets
**************************************
Site 3 core switch
Router ospf 1
Network 192.168.10.0 255.255.255.0 area 0
Network 192.168.11.0 255.255.255.0 area 0
Network 192.168.110.0 255.255.255.0 area 0
redistribute static subnets
redistribute connected subnets
**************************************
Co-Lo Site ASA1
Route outside 0.0.0.0 0.0.0.0 50.50.100.102 1
Router ospf 1
Network 192.168.36.0 255.255.255.0 area 0
Network 50.50.100.100 255.255.255.252 area 0
Default-information originate metric 30 metric-type 1
redistribute static subnets
redistribute connected subnets
**************************************
09-30-2014 02:12 PM
I understand that OSPF to BGP and BGP to OSPF redistribution will happen on all PE routers .
So ,with your requirements I do not see any issues with the configuration , other then below one point :
If you are anyways injecting default route in ospf domain from Co-Lo site , so all other sites unknown destination traffic will anyways follow last resort to Co-Lo ASA , do we still need to redistribute connected / static ?
HTH
Regards
Sunil Bhadauria
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10-01-2014 09:18 AM
Thanks for your help.
Yes I guess you are correct about the redistribute connected and static.
Thanks again,
Mike
10-01-2014 09:21 AM
I do actually have a question, would the routes show up as external ospf routes because they are actually multiple area 0's because they are separated by the MPLS/BGP network?
Mike
10-01-2014 09:26 AM
Hello ,
yes , to other sites routes will be type 5 ( as they will be recieving via redistribution in OSPF).
Regards
Sunil Bhadauria
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10-01-2014 10:11 AM
Ok that should not be a problem.
Now another question.
I want to also redistribute routes for some Site to Site VPN connections.
on the ASA at the Co-Lo I was going to add this...
Crypto map name_of_crypto_map 10 set reverse-route
This will put the route in the routing table as a static route and should get redistributed to all sites if I also add this to the OSPF config
redistribute static subnets
or would I need to add this also or instead?
redistribute connected subnets
10-01-2014 10:58 AM
Hello ,
If considered command is going add a static route in ASA routing table and we need these routes to all other sites then right command would be :
Redistribute static subnets
But still considering you will anyway inject default route in OSPF domain from ASA ,which will set last resort in all site's routes to go to Co-Lo site , do we still need any other route to be injecting from Co-Lo site to OSPF domain ?
Regards
Sunil Bhadauria
! Kindly rate all helpful post and accordingly do mark correct answer to help forum !
10-01-2014 11:18 AM
Yes I see your point. Looks like I was over thinking the setup.
Thanks for your help.
Mike
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