Connecting Devices To The Ethernet Ports; 10/100/1000 Port Connections; Auto-Mdix Connections - Cisco Catalyst 9300 Series Hardware Installation Manual

Switch Installation

Connecting Devices to the Ethernet Ports

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10/100/1000 Port Connections

The switch 10/100/1000 port configuration changes to operate at the speed of the attached device. If the
attached ports do not support autonegotiation, you can manually set the speed and duplex parameters.
Connecting devices that do not autonegotiate or that have the speed and duplex parameters manually set can
reduce performance or result in no linkage.
To maximize performance, choose one of these methods for configuring the Ethernet ports:
• Let the ports autonegotiate both speed and duplex.
• Set the interface speed and duplex parameters on both ends of the connection.

Auto-MDIX Connections

The autonegotiation and the auto-MDIX features are enabled by default on the switch.
With autonegotiation, the switch port configurations change to operate at the speed of the attached device. If
the attached device does not support autonegotiation, you can manually set the switch interface speed and
duplex parameters.
With auto-MDIX, the switch detects the required cable type for copper Ethernet connections and configures
the interface accordingly.
If auto-MDIX is disabled, use the guidelines in this table to select the correct cable.
Table 17: Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Device
Switch to switch
Switch to hub
Switch to computer or server
Switch to router
Switch to IP phone
7 100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5 or higher. 10BASE-T traffic can use Category 3 cable or higher.
10/100/1000 Port Connections, on page 37
PoE+ and Cisco UPOE Port Connections, on page 38
Crossover Cable
Yes
Yes
No
No
No

Connecting Devices to the Ethernet Ports

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Cisco Catalyst 9300 Series Switches Hardware Installation Guide
Straight-Through Cable
No
No
Yes
Yes
Yes
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