Monitoring the Routing Engine

You monitor and maintain the Routing Engine, a key router component, to ensure that all system processes function normally, including routing protocols, packet forwarding tables, router interfaces, system management, JUNOS software and file system storage, and monitoring functions. (See Table 31.)

Table 31: Checklist for Monitoring the Routing Engine

Monitor Routing Engine Tasks	Command or Action
Understanding the Routing Engine Routing Engine Types and Characteristics Routing Engine Locations Routing Engine Redundancy Routing Engine Component Companionship Routing Engine Boot Devices Routing Engine Storage Media
Monitoring the Routing Engine Status
Check the Detailed Routing Engine Status	show chassis routing-engine show chassis environment routing-engine
Check the Routing Engine LEDs	Check the M7i Routing Engine LEDs Check the M20 Router Routing Engine LEDs Check the M40 Router Routing Engine LEDs Check the M40e and M160 Router Routing Engine LEDs Check the M320 Router Routing Engine LEDs Check the T320 Router Routing Engine LEDs Check the T640 Routing Node Routing Engine LEDs
Check the Redundant Routing Engine Status from the Craft Interface CLI Output	show chassis craft-interface
Verifying Routing Engine Failure
Check Core Files If the Routing Engine Reboots	List the Core Files Generated After A Crash Occurs Display the Messages Log File After A Crash Occurs Example of When No Core File Is Generated
Example of Boot Messages If Routing Engine Fails to Boot	show system storage show system boot-messages show log messages
Check for Compact Flash Media and Hard Disk Failure	When the Compact Flash Is Removed from the Boot List Determine Why Compact Flash Did Not Mount When the Hard Disk Is Removed from the Boot List Verify That the Hard Disk Did Not Mount Verify That the Hard Disk Is Missing from The Boot List View Alarms When Media Is Removed from the Boot List
Understand What Happens When Memory Failures Occur
Check the Router File System and Boot Disk	show system storage
Display the Current Routing Engine Alarms	show chassis alarms
Display Error Messages in the System Log File	show log messages
Document the Events Prior to the Failure	Write down failure events as they occur. Turn on logging on your system console.
Getting Routing Engine Hardware Information
Display Routing Engine Hardware Information	show chassis hardware
Locate the Routing Engine Serial Number ID Label	Locate the Routing Engine serial number ID label. If you see two serial numbers, give both to JTAC.
Removing a Routing Engine	The Routing Engine is hot-pluggable. Follow the procedures in the applicable router hardware guide. Note: The M5/M10 routers have a cover over the Routing Engine. The M40e and M160 routers have a cover over all the rear chassis components. Remember to remove the screws (M5/M10, M20, M40e, and M160 routers) or captive screws (T320 router and T640 routing node) next to the ejector clips before you remove the Routing Engine.