Intel 510T manual Communication Problems

C H A P T E R 7 Console Port Use and Troubleshooting

I have poor performance and high numbers of second port drops

	Explanation: There may be a loop in the network and Spanning
	Tree is not enabled.
	Action: Avoid loops, or alternatively, either enable STP on all the
	ports (using Device Setup) or specific ports (using Port
	Setup).
	Communication Problems
The most common	A high percentage of faults are caused by cable faults such as loose
problems are cable	connections or inappropriately wired cables.
problems
Management PCs using	A management PC using IEEE 802.1Q tagged frames may experi-
IEEE 802.1Q tagged	ence communication difficulties with the switch. To manage the
frames	switch from a PC connected directly to the switch, the PC must not
	use frame tagging. To manage the switch from a PC with IEEE
	802.1Q tagged frames, management must be through a device which
	untags the frames.
Spanning Tree topology	When a change is detected in the Spanning Tree network, the devices
changes	forming the Spanning Tree go into a learning state to determine the
	optimal routes between network segments. During this learning state,
	the switch will not forward data traffic.
	This is a normal occurrence for Spanning tree devices and no reme-
	dial action is required. However, if the switch goes into the learning
	state too frequently, the Spanning Tree may be unstable and should
	be examined and possibly reconfigured.
To troubleshoot	If the POWER LED and the STATUS LED are both on, but one or more
communications problems	of the port STATUS LEDs are off, then:
	1 Reset the switch using the Reset button.
	2 Check the STATUS LED for each switch port to which a cable is
	attached.
VLANs	The use of VLAN policies can lead to unexpected communication
	problems. If the policies are not designed with care, ports are not able
	to reach network services. Check your VLAN policies and use the
	VLAN monitoring to review the VLAN membership for that port or
	address.

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