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Configuring Gigabit Ethernet Switching
This chapter describes how to configure Gigabit Ethernet switching on the Catalyst enterprise LAN
switches. The configuration procedures in this chapter apply to Gigabit Ethernet switching modules,
fixed-configuration switches, and uplink ports on the supervisor engine.
For complete syntax and usage information for the commands used in this chapter, refer to the
Note
Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches Command Reference.
This chapter consists of these sections:
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•
•
Understanding How Gigabit Ethernet Works
The following sections describe how Gigabit Ethernet works.
Understanding How Gigabit Ethernet Flow Control Works
Flow control is a feature that Gigabit Ethernet ports use to inhibit 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. This special packet is called a pause frame.
Sending and Receiving Pause Frames
All Catalyst 4500 series Gigabit Ethernet ports can receive and process pause frames from other devices.
However, not all Catalyst 4500 series Gigabit Ethernet ports can transmit pause frames to other devices.
Table 5-1
frames to other devices.
78-15486-01
Understanding How Gigabit Ethernet Works, page 5-1
Default Gigabit Ethernet Configuration, page 5-6
Configuring Gigabit Ethernet Ports, page 5-7
identifies the Catalyst Gigabit Ethernet switches, modules, and ports that can transmit pause
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
C H A P T E R
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Release 8.1
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5-1
- Quick Links:
- Configuration Guide
- Catalyst 2980G Switch
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