Force 10 - Link connectivity for DAC (Twinax) cables on Force 10 switches.
Summary: How to resolve connectivity issues with DAC (Twinax) cables.
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Symptoms
Article summary: This article explains how to resolve connectivity issues with DAC (Twinax) cables.
When using DAC (Direct attached copper, also known as Twinax) cables, you may run into link connectivity issues when not using cr4 auto negotiation. This is resolved by enabling cr4 auto negotiation, which is not enabled by default. The example below shows how to do this on interface 37 on unit 0, and then saves the configuration.
Ftos>enable
Ftos#config
Ftos(config)#interface fortyGigE 0/37
Ftos(config-if-fo-0/37)#intf-type cr4 autoneg
Ftos(config-if-fo-0/37)#end
Ftos#write memory
Note: This command is only applicable on Forty-Gigabit Ethernet interfaces.
To remove the above configuration run the following command in the interface configuration.
Ftos(config-if-fo-0/37)#no intf-type cr4 autoneg
Affected Products
PowerSwitch S4810P, PowerSwitch S5000, Force10 S60-44T, PowerSwitch S6000, Force10 Z9000, Dell Networking Z9500Article Properties
Article Number: 000127228
Article Type: Solution
Last Modified: 05 Jun 2025
Version: 5
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