4-8
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 4 Configuring Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet Switching
Setting the Port Configuration
With software release 8.3(1) and later releases, the set port auto-mdix mod/port {enable | disable}
command is introduced to disable auto-MDI/MDIX on all the modules that currently have this feature
enabled by default. Use the show port auto-mdix [mod[/port]] command to display auto-MDI/MDIX
settings.
Configuring IEEE 802.3x Flow Control
Gigabit Ethernet and 10-Gigabit Ethernet ports on the Catalyst 6500 series switches use flow control to
inhibit the transmission of packets to the port for a period of time; other Ethernet ports use flow control
to respond to flow-control requests.
If a Gigabit Ethernet or a 10-Gigabit Ethernet port receive buffer becomes full, the port transmits a
“pause” packet that tells remote ports to delay sending more packets for a specified period of time. All
Ethernet ports (10000 Mbps, 1000 Mbps, 100 Mbps, and 10 Mbps) can receive and act upon “pause”
packets from other devices.
Enter the set port flow control command to configure flow control on ports. Table 4-3 lists the set port
flowcontrol command keywords and describes their functions.
To configure flow control, perform this task in privileged mode:
This example shows how to turn on transmit and receive flow control and verify the flow-control
configuration:
Console> (enable) set port flowcontrol 3/1 send on
Port 3/1 will send flowcontrol to far end.
Table 4-3 Ethernet-Flow Control Keyword Functions
Keywords Function
receive on
1
1. On WS-X6502-10-Gigabit Ethernet ports, flow control on the receive side is always on and cannot be set to off. On
WS-X6704, WS-X6708-10-Gigabit Ethernet ports and Supervisor Engine 720-10 Gigabit Ethernet uplink ports flowcontrol
for both send and receive side can be set to off.
The port uses flow control dictated by the neighboring port.
receive desired The port uses flow control if the neighboring port uses it and does not
use flow control if the neighboring port does not use it.
receive off The port does not use flow control, regardless of whether flow control is
requested by the neighboring port.
send on
2
2. Supported only on Gigabit Ethernet and 10-Gigabit Ethernet ports.
The port sends flow-control frames to the neighboring port.
send desired
2
The port sends flow-control frames to the port if the neighboring port
asks to use flow control.
send off
2
The port does not send flow-control frames to the neighboring port.
Task Command
Step 1
Set the flow-control parameters. set port flowcontrol mod/port {receive | send}
{off | on | desired}
Step 2
Verify the flow-control configuration. show port flowcontrol
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