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Chapter 4
Configuring Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet Switching
Port negotiation does not involve negotiating port speed. You cannot disable port negotiation with the
Note
set port speed command.
Port negotiation exchanges flow-control parameters, remote fault information, and duplex information.
Configure port negotiation with the set port negotiation command. Port negotiation is enabled by
default.
Note
When you enable port negotiation on the 16-port 10/100/1000BASE-T Ethernet modules, the system
autonegotiates flow control only.
The ports on both ends of a link must have the same setting. The link will not come up if the ports at
each end of the link are set inconsistently (port negotiation is enabled on one port and is disabled on the
other port).
Table 4-1
configuration.
Table 4-1
Port Negotiation State
Near End
Off
On
Off
On
1. Near End refers to the local port.
2. Far End refers to the port at the other end of the link.
Default Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit
Ethernet Configuration
Table 4-2
configuration.
Table 4-2
Feature
Port enable state
Port name
OL-8978-04
Default Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet Configuration
shows the four possible port negotiation configurations and the resulting link status for each
Port Negotiation Configuration and Possible Link Status
1
2
Far End
Off
On
On
Off
shows the Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet default
Ethernet Default Configuration
Default Value
All ports are enabled
None
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Link Status
Near End
Up
Up
Up
Down
Far End
Up
Up
Down
Up
4-3
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Troubleshooting
