We are using the 4G HWIC in the cisco 2900 ISR routers
for backup WAN connectivity via VPN tunnel. We have built EEM scripts that
enable the cellular interface when the primary ISP (interface) fails.
working
cellular status......
Radio Information
=================
Radio power mode = ON
Current RSSI = -64 dBm
LTE Technology Preference = LTE
LTE Technology Selected = LTE
After
around 7-10 days the cellular card startsto roam as if the card is hibernating.
Radio Information
=================
Radio power mode = ON
Current RSSI = -125 dBm
LTE Technology Preference = LTE
LTE Technology Selected = LTE
The only way to fix the problem so far that I found is to power
cycle the router. This will not work as a solution. we have tried shutting down
the cellular interface but that does not work and you can not reset the radio
from the IOS commads. we called Verizon to see if the 4G network was blocking
me due to inactivty and they pointed to the cellular card as the problem.
This is a bug with the modem firmware that runs onthe HWIC itself.
Luckily new firmware has been released which you must get from Cisco. Once you
load the firmware in flash, the command is- microcode reload cellular 0 0 modem-provision
flash:MC7750_VZW_03.05.10.06_00.cwe (assuming your HWIC is in slot 0)
After
you upgrade the modem to the new firmware you can get rid of all those EEM
scripts. It should run great after this upgrade. We had the exact same problem
you have and it fixed issues with a number of sites. The modem will power cycle
after the upgrade so you will loose connectivity but if the upgrade is
successful the connection should nail back up after the power cycle. This
problem has plagued us since day one of these LTE HWICs. The minimum IOS to support
the new modem firmware is 15.2(4)M3. Make sure you upgrade the IOS first, then
the modem.
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