Installation guide

40 Release Notes for Catalyst 6000 Family Software Release 5.x
Documentation Updates for Software Release 5.2
Understanding How Port Negotiation Works
Note Port negotiation does not involve negotiating port speed. You cannot disable port negotiation
with the 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.
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 enabled on one port and disabled on
the other). Table 4 shows the four possible port negotiation configurations and the resulting link
status for each configuration.
Configuring Port Negotiation
To enable port negotiation, perform this task in privileged mode:
This example shows how to enable port negotiation and verify the configuration:
Console> (enable) set port negotiation 2/1 enable
Port 2/1 negotiation enabled
Console> (enable) show port negotiation 2/1
Port Link Negotiation
----- ----------------
2/1 enabled
Console> (enable)
To disable port negotiation, perform this task in privileged mode:
Table 4 Gigabit Ethernet Autonegotiation Configuration and Possible Link States
Port Negotiation State Link Status
Near End
1
1 Near End refers to the local port.
Far End
2
2 Far End refers to the port at the other end of the link.
Near End Far End
Off Off Up Up
On On Up Up
OffOnUpDown
On Off Down Up
Task Command
Step 1 Enable port negotiation. set port negotiation mod_num/port_num enable
Step 2 Verify the port negotiation configuration. show port negotiation [mod_num/port_num]
Task Command
Step 1 Disable port negotiation. set port negotiation mod_num/port_num disable
Step 2 Verify the port negotiation configuration. show port negotiation [mod_num/port_num]