Network Router User Manual

4-5
Layer 3 Switching Software Feature and Configuration Guide
78-6235-04, Cisco IOS Release 12.0(10)W5(18)
Chapter 4 Configuring Interfaces
About Layer 3 Switching Interfaces
Initially Configuring Gigabit Ethernet Interfaces
To configure an IP address and autonegotiation on a Gigabit Ethernet interface, perform the following
steps, beginning in global configuration mode:
Example
The following example demonstrates initially configuring a Gigabit Ethernet interface with
autonegotiation and an IP address:
Router(config)# interface gigabitethernet 0/0/0
Router(config-if)# negotiation auto
Router(config-if)# ip address 10.1.2.3 255.0.0.0
Router(config-if)# exit
Router(config)# ^Z
C8540-CSR# copy system:running-config nvram:startup-config
About the Enhanced Gigabit Ethernet Interfaces (Catalyst 8540)
The enhanced Gigabit Ethernet interface module provides two Gigabit Ethernet interfaces with built-in
ACL support; no daughter card is required. The POS OC-12c uplink interface module and the ATM
uplink interface module also include a single enhanced Gigabit Ethernet interface. See “Configuring the
POS OC-12c Uplink Interface (Catalyst 8540)” section on page 4-14” and “Configuring the ATM
Uplink Interface (Catalyst 8540)” section on page 4-28.
There is no special configuration required for the enhanced Gigabit Ethernet interfaces other than that
used for other Gigabit Ethernet interfaces.
Command Purpose
Step 1
Router(config)# interface gigabitethernet
slot/subslot/interface
Router(config-if)#
Enters Ethernet interface configuration mode to
configure the Gigabit Ethernet interface.
Step 2
Router(config-if)# [no] negotiation auto Specifies the negotiation mode.
When you set negotiation mode to auto, the
Gigabit Ethernet port attempts to negotiate the
link (that is, both port speed and duplex setting)
with the partner port.
When you set the Gigabit Ethernet interface to no
negotiation auto, the port forces the link up no
matter what the partner port setting is. This brings
up the link with 1000 Mbps and full duplex only.
Step 3
Router(config-if)# ip address ip-address
subnet-mask
Specifies the IP address and IP subnet mask to be
assigned to the Gigabit Ethernet interface.
Step 4
Router(config-if)# exit
Router(config)#
Returns to global configuration mode. Repeat
Steps 1 to 3 to configure another Gigabit Ethernet
interface on this interface module.
Step 5
Router(config)# end Returns to privileged EXEC mode.
Step 6
Router# copy system:running-config
nvram:startup-config
Saves your configuration changes to NVRAM.