Whatever router boots up first, becomes the DR. If R1 had OSPF up and running before R2, it will be the DR as there isn't any preemption under OSPF. You would have to clear ospf process on both routers at the same time so R2 can regain DR status.
When the router boots up and OSPF is activated on an interface, it queries all OSPF speaking devices in a LAN for DR/BDR status. If none exists, it assume the DR role. A second router boots up on that same LAN and do the same, will find the current DR running on that segment and will assume the BDR role regardless of its OSPF priority and|or RouterID.
There is no preemption under OSPF, in other words, the second router won't take over the first router's assignment.
For that reason, if you want to ensure a router will always be the DR of a segment, you must change the OSPF priority on this router to 255 and all other routers to 0 so they won't participate on the election - regardless when they were booted up.
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.