I am encounter with 1841(IOS 12.4) router using with ospf over mGRE.
We are using Hub to Spoke technology. We are using 2 Hubs(2621 router)(primary-ethernet and backup-ISDN).
We have 8 spoke sites using with 1721(router) currently.
I want to migrate to 1841 router to one of the spoke. I configured like as old 1721 settings on 1841 new router. I can reach only 6 spoke sites. unfortunately I can't reach to 1 spoke site.(We can reach all spoke site using with old 1721 router.)
I don't know why I can't reach to one of the spoke.
IOS version of 7 spoke sites are IOS12.2(4)YA2) and one is the IOS 12.2(15)T10)that i can't reach.
Is there any issue on different IOS version on DMVPN method. ( I read from cisco website they mention before 12.0 IOS and after 12.0 IOS can't work together)
Hub1 router is using IOS 12.2(13)T version and Hub2 router is using IOS 12.2(11)YT2 version.
I can't get permission for upgrade branch1 IOS. coz: this one is controlled by other vendor. Anyway I will tell them to this problem. Can I get the fully references for this problem.(like as other forum thread or different version IOS problem on DMVPN). May be I need force to tell them to upgrade branch1 IOS.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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