DMVPN over 3G failover

[Patrick McGrogan]

Hi Folks,

I have been tasked with getting our 3G failover routers to go to an external address to receive NTP when dmvpn tunnels are down.

I have tried adding static routes out to google's DNS with no joy has anyone input on something I may be missing

Thanks

Pat

[Mark Malone]

If your dmvpn tunnel is down and these 3g routers have direct access to the internet you should just need to set the ntp server (public ip address) and then set your other devices to point there ntp to your 3g router ip which is now receiving its time from an internet based system

You can have multiple ntp server addresses on a router but only 1 can be preferred at a time for obvious reasons you cant have multiple time sources

So you could make your usual server when dmvpn is up as the preferred and then when dmvpn fails and that time source is unreachable have the public ntp server as the 2nd most preferred

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swadmin.html

[ishan2106]

Set preference to your static route with AD values .

config 'keepalive' in ur dmvpn tunnel

track your dmpvn tunnel , if it goes down , the route should follow 3G .

tnx