Cisco Catalyst 4500 Series Software Configuration Manual page 469

For the blocking ports on the WS-X4416 module, do not set the speed to autonegotiate.To set port speed
Note
to 10/ 100 Mpbs on a 10-Gigabit Ethernet interface (on a 1000Base-T port), perform this task:
Command
Step 1
Switch(config)# interface tengigabitethernet
slot/interface
Step 2
Switch(config-if)# speed [10 | 100]
To restore autonegotiation (default setting), enter the no speed command in the interface configuration mode.
This example shows how to set the interface speed to 100 Mbps on a 10-Gigabit Ethernet interface 2/4:
Switch(config)# interface tengigabitethernet 2/4
Switch (config-if)# speed 100
Setting Multigigabit Ethernet Interface Speeds
Only ports 1 to 12 on the WS-X4748-12X48U+E module support Multigigabit Ethernet. For more information, see
MultiGigabit Ports on WS-X4748-12X48U+E, page
To set port speed to 2500Mbps (2.5Gbps) / 5000Mbps (5Gbps) / 10000Mbps (10Gbps) on a Multigigabit Ethernet interface (on
a 1000Base-T port), perform this task:
For Multigigabit Ehternet ports 1 to 12, autonegotiation is enabled by default, and the link is active if
Note
both peers are Multigigabit Ehternet ports, and if forced speed is configured.
For 1 Gigabit Ethernet ports 13 to 48, the link is active only if autonegotiation is enabled at least at one
end, and forced speed is configured.
Command
Step 1
Switch(config)# interface tengigabitethernet
slot/interface
Step 2
Switch(config-if)# speed [100 | 1000 | 2500 |
5000 | 10000 | auto [100 | 1000 | 2500 | 5000 |
10000]]
Step 3
Switch(config-if)# [no] downshift disable
This example shows how to set the interface speed to 5G on the Multigigabit Ethernet interface 3/1:
Switch(config)# interface tengigabitethernet 3/1
Switch (config-if)# speed 5000
Chapter 9 Configuring Interfaces
9-15.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS
Configuring Optional Interface Features
Purpose
Specifies the interface to be configured.
Sets the interface speed.
Forced 10/100 auto-negotiation is not supported on a
1000Base-T port
Purpose
Specifies the interface to be configured.
Sets the interface speed.
Note 10G speed is supported only on Category 6 and
Category 6a cables.
By default, downshift is enabled on multigigabit ports.
The downshift disable command disables downshift on
the specified interface. The no downshift disable
command enables downshift on the interface.
Configuring