Monitoring Redundant SFMs

You monitor redundant Switching and Forwarding Modules (SFMs) to ensure that traffic transiting the router is handled properly. SFMs contain the Internet Processor II application-specific integration circuits (ASICs), which make forwarding decisions, and the Distributed Buffer Manager ASICs, which distribute data cells throughout memory and forward notification of outgoing packets. (See Table 123.)

Table 123: Checklist for Monitoring Redundant SFMs

Monitor Redundant SFM Tasks	Command or Action
Understanding Redundant SFMs
Understanding M40e Router Redundant SFM Configuration
Understanding M40e Router Redundant SFM Operation
Understanding M160 Router Redundant SFM Operation
Displaying Redundant SFM Hardware Information	show chassis hardware
Monitoring Redundant SFM Status
Display the SFM Summary Status	`show chassis sfm` `sfm-slot` `show chassis sfm detail` `sfm-slot`
Display the SFM LED Status at the Command Line	`show chassis craft-interface`
Check the SFM LED Status on the Faceplate	Check the SFM faceplate at the back of the M40e and M160 router chassis.
Display the SFM Environmental Status	`show chassis environment` `show chassis environment sfm` `slot`
Displaying Redundant SFM Mastership
Display SFM Mastership at the Command Line	`show chassis sfm`
Display SFM Mastership Information from the Craft Interface	`show chassis craft-interface`
Displaying Redundant SFM Alarms
Display the Current Redundant SFM Alarms	`show chassis alarms`
Display SFM Error Messages in the System Log File	`show log messages`
Display SFM Error Messages in the Chassis Daemon Log File	`show log chassisd \| match sfm`
Verifying SFM Failure
Check the SFM Connection	Check the thumbscrews on the SFM ejector locking tabs.
Restart the SFM	`request chassis sfm slot` `slot-number` `restart`
Perform an SFM Swap Test	Take the SFM offline. Replace the SFM with one that you know works. Bring the SFM online. Check the SFM status by using the `show chassis sfm` CLI command.
Controlling Redundant SFMs
Take an SFM Offline	`request chassis sfm slot` `slot-number` `offline`
Bring an SFM Online	`request chassis sfm slot` `slot-number` `online`
Switch SFM Mastership	(M40e router only) `request chassis sfm master switch <no-confirm>`
Replacing an SFM	Take the SFM offline. Remove the failed SFM. Install a new SFM. Bring the SFM online. Verify that SFM is online by using the `show chassis sfm` CLI command.