fellow cisco users, we have deployed approximately 15 Cisco C819HG ISRs to remote locations. _all the routers deployed are of the 4G Verizon version and they work very well. _my issue is, when the wireless carrier service drops and comes back in 3G mode the router connects as advertised but, when the wireless service steps up to 4G(LTE) the router stays at the 3G technology and requires a cellular interface restart to connect at the 4G technology. _my question, is there a parameter i'm missing to configure the ISR to auto reconnect with 4G technology when available.??? _i have included my ISR config.
version 15.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
chat-script lte "" "AT!CALL" TIMEOUT 20 "OK"
!
controller Cellular 0
!
interface Cellular0
description $FW_OUTSIDE$
ip address negotiated
ip access-group 104 in
ip nat outside
ip virtual-reassembly in
encapsulation slip
dialer in-band
dialer idle-timeout 0
dialer string lte
dialer-group 1
async mode interactive
crypto map SDM_CMAP_1
!
interface FastEthernet0
no ip address
!
interface GigabitEthernet0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0
no ip address
shutdown
clock rate 2000000
!
interface Vlan1
description $FW_INSIDE$
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
ip access-group 103 in
ip nat inside
ip virtual-reassembly in
!
ip forward-protocol nd
!
ip route 0.0.0.0 0.0.0.0 Cellular0
!
dialer-list 1 protocol ip permit
!
route-map SDM_RMAP_1 permit 1
match ip address 101
!
control-plane
!
mgcp behavior rsip-range tgcp-only
mgcp behavior comedia-role none
mgcp behavior comedia-check-media-src disable
mgcp behavior comedia-sdp-force disable
!
mgcp profile default
!
line con 0
no modem enable
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
stopbits 1
line 3
script dialer lte
modem InOut
no exec
transport input all
rxspeed 100000000
txspeed 50000000
line vty 0 4
login local
transport input all
!
scheduler allocate 20000 1000
ntp master 1
ntp update-calendar
ntp server xxx.xxx.xxx.xxx prefer source Cellular0
!
end
