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Aug 12th, 2003
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I have one WS-C3750G-24T-E switch. In config guide, I noticed that "You cannot configure Gigabit Ethernet interfaces to operate in

half-duplex mode." Is that means we cannot connect 10BaseT half duplex device to 10/100/1000 port ?

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sbilgi Mon, 08/18/2003 - 10:52
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For gigabit ethernet over fiber, auto-negotiation negotiates full/half duplex and pause (flow control capabilities). Auto-negotiation for gigabit ethernet, unlike that for fast ethernet, does not negotiate data rate. With Gigabit_Ethernet, it is required piece of the IEEE 802.3z spec. that compliant devices support Auto-Negotiation. Basically Auto-Negotiation in Gigabit_Ethernet covers *Duplex settings: Cisco devices will only support full-duplex,the IEEE 802.3z standard does have support for half-duplex Gigabit_Ethernet. Because of this,duplex is negotiated between Gigabit_Ethernet devices.

rypat Mon, 08/18/2003 - 18:26
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In my case is gigabit over copper, is it the same ?


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