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Solution # K17193366
Title Packet loss may occur when user connects to a server due to misconfiguration, NIC compatibility or physical layer issues
Resolution If packet loss occurs while connecting a switch to a server, perform these steps:

  1. Verify that the cable is good by using a cable tester or replace it with a known good cable.

  2. Verify that the Network Interface Card (NIC) is compatible and working properly. Refer to Troubleshooting Cisco Catalyst Switches to NIC Compatibility Issues.

  3. Verify that the speed and duplex settings are the same on both sides of the link.

    If both sides are set to auto and problems persist, eliminate auto-negotiation issues by hard setting the speed and duplex on both sides.

    Do not set one side to auto and hard set the other side, as this can result in a mismatch. To set the duplex and speed on a set-based switch, issue the set port speed and set port duplex commands.

    For example, to set the speed to 100 and the duplex to full on port 3/2, issue the set port speed 3/2 100 and set port duplex 3/2 full commands.

    On an Cisco IOS® Software based switch, issue the duplex full and speed 100 interface configuration commands.

  4. Verify that the flow control settings are the same on both sides of a Gigabit Ethernet link. The Gigabit auto-negotiation negotiates flow control, duplex mode and remote fault information. You must either enable or disable link negotiation on both ends of the link. Both ends of the link must be set to the same value or the link will not connect. The set-based command to control this setting is set port negotiation mod#/port# enable or disable.

    The Cisco IOS Software based command is negotiation auto or no negotiation auto.
Problem Type Performance issues
Catalyst switch
Catalyst 3560 series switches
Catalyst 3750 series switches
Catalyst 5500 series switches
Catalyst 3500XL series switches
Catalyst 6000 series switches
Catalyst 2950 series switches
Catalyst 6500 series switches
Catalyst 2970 series switches
Catalyst 2960 series switches
Catalyst 3550 series switches
Switch software
Cisco IOS system software
CatOS system software
Device connected to switch Server
Direct URL http://www.ciscotaccc.com/lanswitching/showcase?case=K17193366

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