Cisco Systems 4500 Configuring Flow Control

6-20
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 6 Configuring Interfaces
Configuring Optional Interface Features
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
1456 packets output, 111609 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Switch#
Adding a Description for an Interface
You can add a description about an interface to help you remember its function. The description appears
in the output of the following commands: show configuration, show running-config, and
show interfaces.
To add a description for an interface, enter the following command:
This example shows how to add a description on Fast Ethernet interface 5/5:
Switch(config)# interface fastethernet 5/5
Switch(config-if)# description Channel-group to "Marketing"
Configuring Flow Control
Gigabit Ethernet ports use flow control to slow down the transmission of incoming packets. If a buffer
on a Gigabit Ethernet port runs out of space, the port transmits a special packet that requests remote ports
to delay sending packets for a period of time. The port can also receive this special packet from its link
partner for the same purpose. This special packet is called a pause frame.
The default settings for Gigabit Ethernet interfaces are as follows:
• Sending pause frames is off—Non-oversubscribed Gigabit Ethernet interfaces.
• Receiving pause frames is desired—Non-oversubscribed Gigabit Ethernet interfaces.
• Sending pause frames is on—Oversubscribed Gigabit Ethernet interfaces.
• Receiving pause frames is desired—Oversubscribed Gigabit Ethernet interfaces
The default settings for 10-Gigabit Ethernet interfaces are as follows:
• Sending pause frames is off.
• Receiving pause frames is on.
Note desired is not a flow control option on the 10-Gigabit Ethernet interfaces.
Command Purpose
Switch(config-if)# description string Adds a description for an interface.