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Use the keyword cell-host for fixed platforms and cell-hwic for modular platforms such as the Cisco Integrated Services Routers Generation 2 (ISR G2) platforms. Turn off the automatic modem link recovery and use this command in privileged mode. Press CTRL+SHIFT+6 and then ENTER to return in to the router prompt. Value “0” indicates it is in the diagnostic mode Router# telnet 10.1.1.1 2003Īt!entercnd="A710" - To Enter in to privileged mode.Īt!eroption=0 - Switches the modem to the Special Diagnostic modeĪt!eroption? - Queries the modem state. Reverse telnet to the modem and configure the modem in the special diagnostic mode to collect the crash information. Configure a Loopback interface on the router and assign an IP address. Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int As seen, line number three corresponds to the cellular modem. Verify the line number correspond to the cellular modem. This command needs to be configured to run some of the IOS test commands. When the modem is in the crashed state, it is useful only for crash dump collection, but it doesn't provide any data service. Once the modem crashes, it remains in the crashed state and the crash dump from the router is collected. Once the router is configured in the diagnostic mode, wait till the modem crashes again. The router needs to be configured in the special diagnostic mode to collect the crash dump. PRI SKU ID =, PRI version = Configure Router to Collect the Crash Dump International Mobile Equipment Identity (IMEI) = International Mobile Subscriber Identity (IMSI) = When the modem is in a crashed state, modem hardware statistics will be empty: pqyr174#show cellular 0 hardware These error messages in router console or logs indicate a modem firmware crash: %CISCO800-2-MODEM_DOWN: Cellular0 modem is now DOWN If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on Cisco 4G fixed Routers and modules. Prerequisites RequirementsĬisco recommends that you have knowledge of LTE technology and configuration of the same on a Cisco Router. The crash information is necessary for the Cisco Technical Assistance Center (TAC) to analyse the root cause for cellular modem crash issues. This document describes the procedure to collect modem crash information on Cisco Long Term Evolution (LTE) Routers.