The show controllers exec command is another important diagnostic tool when troubleshooting serial lines. The command syntax varies depending on platform:
• For serial interfaces on Cisco 7000 series routers, use the show controllers cbus exec command
• For Cisco access products, use the show controllers exec command
• For the AGS, CGS, and MGS, use the show controllers mci exec command
Figure 15-2 shows the output from the show controllers cbus exec command. This command is used on Cisco 7000 series routers with the Fast Serial Interface Processor (FSIP) card. Check the command output to make certain that the cable to the channel service unit/digital service unit (CSU/DSU) is attached to the proper interface. You can also check the microcode version to see whether it is current.
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