I have an issue with OSPF. We have an area 0 and 1 and 2. 1 and 2 both connect to 0 via tunnels. Since 1 and 2 both connect to the backbone this is fine at the moment, but we are being pushed to put a wireless link between 1 and 2 to pass a portion of the traffic from 1 to 2. I have recommended putting making 1 & 2 just 1. They are withing 20 miles of each other and have all the same requirements. Also, we will add passive interfaces and some route maps. Ugh. Can we do this without the area change? All OSPF white papers suggest "NO". All input welcome!
The only way at the moment would be some statics or another protocol, redistributed in, with filters are the ABR to block the routes from making it back into area 0. I thought there was a feature coming to fix this, but I've looked around some, and can't seem to find it.
Probably the easiest way to do this is to use another ospf process, redistributing into the new ospf process from the current one, and redistributing back into the current ospf process from the new one. It sounds like you would only have one point of redistribution, on either end of the new wireless link, so you really shouldn't need to worry about tagging the routes to prevent a routing loop with the mutual redistribution.
But you do want to filter these externals so they don't make it into area 0 (unless you want to use one area as a back for another area). It might be easiest to tag the routes as they are redistributed into the original ospf process, so you can filter based on those tags at the ABR into area 0. If you need help with a sample configuration, post here, and I can work something up in the lab.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.