Cisco Systems ME 2400 manual Errdisable recovery cause

Chapter 3 Troubleshooting

Diagnosing Problems

Table 3-1 Common Problems and Their Solutions (continued)

Symptom	Possible Cause	Resolution
No connectivity	Incorrect or bad cable
	These are results of no link at both
	ends:
	• A crossover cable was used	• For the correct pinouts and
	when a straight-through was		the proper application of
	required, or the reverse.		crossover instead of
			straight-through cables, see
			the “Two Twisted-Pair
			Cable Pinouts” section on
			page B-3.
		•	Enable the automatic
			medium-dependent-
			interface crossover
			(auto-MDIX) feature.
	• The cable is wired incorrectly.	• Replace with a tested good
			cable.
	• A crossover or straight-through	•	For 1000BASE-T
	cable is wired incorrectly.		connections, be sure to use
			a twisted four-pair,
			Category 5 cable.
	• STP checking for possible	• Wait 30 seconds for the port
	loops. STP is available only on		LED to turn green.
	network node interfaces (NNIs).
Unreadable characters on the	Incorrect baud rate.	Reset the emulation software to
management console		9600 baud.
Amber system LED	Fatal POST error detected.	Contact Cisco Systems.
The switch port is placed in	Bad or non-Cisco-approved SFP	Remove the SFP module from
error-disabled state after SFP	module.	the switch, and replace it with a
module is inserted		Cisco-approved module. Use the
		errdisable recovery cause
		gbic-invalid global
		configuration command to
		verify the port status, and enter a
		time interval to recover from the
		error-disabled state.
		See the switch command
		reference guide for information
		on the errdisable recovery
		command.

Cisco ME 2400 Ethernet Access Switch Hardware Installation Guide

OL-7678-01 3-3