Cisco ASR1002-5G-SHA/K9 Software Guide - Page 33

Chapter 2 Using Cisco IOS XE Software Understanding the Diagnostic Mode Table 2-3 Accessing and Exiting Command Modes (continued) Command Mode Diagnostic ROM monitor Access Method Prompt The router boots up or accesses diagnostic mode in the following scenarios: Router(diag)# In some cases, diagnostic mode will be reached when the IOS process or processes fail. In most scenarios, however, the router will reload. A user-configured access policy was configured using the transport-map command that directed the user into diagnostic mode. See the "Console Port, Telnet, and SSH Handling" chapter of this book for information on configuring access policies. The router was accessed using a Route Processor auxiliary port. A break signal (Ctrl-C, Ctrl-Shift-6, or the send break command) was entered and the router was configured to go into diagnostic mode when the break signal was received. From privileged EXEC mode, use the reload > EXEC command. Press the Break key during the first 60 seconds while the system is booting. Exit Method If the IOS process failing is the reason for entering diagnostic mode, the IOS problem must be resolved and the router rebooted to get out of diagnostic mode. If the router is in diagnostic mode because of a transport-map configuration, access the router through another port or using a method that is configured to connect to the Cisco IOS CLI. If the router is accessed through the Route Processor auxiliary port, access the router through another port. Accessing the router through the auxiliary port is not useful for customer purposes anyway. To exit ROM monitor mode, use the continue command. Understanding the Diagnostic Mode Diagnostic mode is new on the Cisco ASR 1000 Series Routers. The router boots up or accesses diagnostic mode in the following scenarios: • The IOS process or processes fail, in some scenarios. In other scenarios, the RP will simply reset when the IOS process or processes fail. • A user-configured access policy was configured using the transport-map command that directs the user into diagnostic mode. • The router was accessed using a Route Processor auxiliary port. • A send break signal (Ctrl-C or Ctrl-Shift-6) was entered while accessing the router, and the router was configured to enter diagnostic mode when a break signal was sent. In diagnostic mode, a subset of the commands that are also available in User EXEC mode are made available to users. Among other things, these commands can be used to: • Inspect various states on the router, including the IOS state. • Replace or roll back the configuration. • Provide methods of restarting the IOS or other processes. • Reboot hardware, such as the entire router, an RP, an ESP, a SIP, a SPA, or possibly other hardware components. OL-16506-10 Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 2-7