I need to change the tunnel IP address for all of our remote sites that connect via DMVPN. I'm trying to figure the best way to accomplish this while causing the lease impact on users. My theory is that I could create new tunnel interfaces using the new IP address for the tunnel, then simply remove the old tunnel interface. I'm not sure if I can have two tunnels that have the same IP address in the 'ip nhrp map' and 'ip nhrp multicast' lines on the configuration. For example, here is a current spoke's configuration:
interface Tunnel0
description ### DMVPN ###
bandwidth 1152
ip address 10.9.200.201 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp authentication AUTH-METH1
ip nhrp map 10.9.200.1 PUB.LIC.IP.132
ip nhrp map multicast PUB.LIC.IP.132
ip nhrp map 10.9.200.2 PUB.LIC.IP.25
ip nhrp map multicast PUB.LIC.IP.25
ip nhrp network-id 1
ip nhrp nhs 10.9.200.1
ip nhrp nhs 10.9.200.2
ip nhrp server-only
ip tcp adjust-mss 1300
tunnel source FastEthernet0/1
tunnel mode gre multipoint
tunnel protection ipsec profile DMVPN
!
I would like to keep the above configuration and add the following tunnel:
interface Tunnel1
description ### DMVPN ###
bandwidth 1152
ip address 10.100.100.201 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp authentication AUTH-METH1
ip nhrp map 10.100.100.1 PUB.LIC.IP.132
ip nhrp map multicast PUB.LIC.IP.132
ip nhrp map 10.100.100.2 PUB.LIC.IP.25
ip nhrp map multicast PUB.LIC.IP.25
ip nhrp network-id 1
ip nhrp nhs 10.100.100.1
ip nhrp nhs 10.100.100.2
ip nhrp server-only
ip tcp adjust-mss 1300
tunnel source FastEthernet0/1
tunnel mode gre multipoint
tunnel protection ipsec profile DMVPN
!
Does anybody know if that is possible or will that cause issues with the existing tunnels? Any assistance would be greatly appreciated.
