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Chapter 4
Configuring Ethernet and Fast Ethernet Switching
Note
If the port speed is set to auto on a 10/100-Mbps Fast Ethernet port, both speed and duplex are
autonegotiated.
To set the port speed for a 10/100-Mbps port, perform this task in privileged mode:
Task
Step 1
Set the port speed of a 10/100-Mbps Fast Ethernet
port.
Step 2
Verify that the speed of the port is configured
correctly.
This example shows how to set the port speed to 100 Mbps on port 2/2:
Console> (enable) set port speed 2/2 100
Port 2/2 speed set to 100 Mbps.
Console> (enable)
This example shows how to make port 2/1 autonegotiate speed and duplex with the neighbor port:
Console> (enable) set port speed 2/1 auto
Port 2/1 speed set to auto-sensing mode.
Console> (enable)
Setting the Port Duplex Mode
You can set the port duplex mode to full or half duplex for Ethernet and Fast Ethernet ports.
If the port speed is set to auto on a 10/100-Mbps Fast Ethernet port, both speed and duplex are
Note
autonegotiated. You cannot change the duplex mode of ports configured for autonegotiation. For
information on enabling and disabling autonegotiation on 10/100 Fast Ethernet ports, see the
the Port Speed" section on page
To set the duplex mode of a port, perform this task in privileged mode:
Task
Step 1
Set the duplex mode of a port.
Step 2
Verify that the duplex mode of the port is
configured correctly.
This example shows how to set the duplex mode to half duplex on port 2/1:
Console> (enable) set port duplex 2/1 half
Port 2/1 set to half-duplex.
Console> (enable)
78-12647-02
4-4.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Configuring Ethernet and Fast Ethernet Ports
Command
set port speed mod num/port num {10 | 100 |
auto}
show port [mod_num[/port_num]]
Command
set port duplex mod num/port num {full | half}
show port [mod_num[/port_num]]
"Setting
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Troubleshooting
