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22-3
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 22 Configuring Layer 3 Interfaces
Configuration Guidelines
Configuration Guidelines
A Catalyst 4500 series switch supports AppleTalk routing and IPX routing. For AppleTalk routing and
IPX routing information, refer to “Configuring AppleTalk” and “Configuring Novell IPX” in the
Cisco IOS AppleTalk and Novell IPX Configuration Guide at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/atipx_c/index.htm
A Catalyst 4500 series switch does not support subinterfaces or the encapsulation keyword on Layer 3
Fast Ethernet or Gigabit Ethernet interfaces.
Note As with any Layer 3 interface running Cisco IOS software, the IP address and network assigned to an
SVI cannot overlap those assigned to any other Layer 3 interface on the switch.
Configuring Logical Layer 3 VLAN Interfaces
Note Before you can configure logical Layer 3 VLAN interfaces, you must create and configure the VLANs
on the switch, assign VLAN membership to the Layer 2 interfaces, enable IP routing if IP routing is
disabled, and specify an IP routing protocol.
To configure logical Layer 3 VLAN interfaces, perform this task:
This example shows how to configure the logical Layer 3 VLAN interface vlan 2 and assign an IP
address:
Switch> enable
Switch# config term
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# vlan 2
Switch(config)# interface vlan 2
Switch(config-if)# ip address 10.1.1.1 255.255.255.248
Switch(config-if)# no shutdown
Switch(config-if)# end
Command Purpose
Step 1
Switch(config)# vlan
vlan_ID
Creates the VLAN.
Step 2
Switch(config)# interface vlan
vlan_ID
Selects an interface to configure.
Step 3
Switch(config-if)# ip address ip_address
subnet_mask
Configures the IP address and IP subnet.
Step 4
Switch(config-if)# no shutdown
Enables the interface.
Step 5
Switch(config-if)# end
Exits configuration mode.
Step 6
Switch# copy running-config startup-config
Saves your configuration changes to NVRAM.
Step 7
Switch# show interfaces [
type slot/interface
]
Switch# show ip interfaces [
type slot/interface
]
Switch# show running-config interfaces [
type
slot/interface
]
Switch# show running-config interfaces vlan vlan_ID
Verifies the configuration.