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Configuring the Layer 3 Services Module Gigabit Ethernet Interfaces
Option 3: Interfaces as Independent Links
If your Catalyst 4000 switch has only a few VLANs, use the independent interface configuration option.
When you are providing Layer 3 gateway services for only one or two VLANs, trunking is not
necessary. The Catalyst 4000 Layer 3 Services module Gigabit Ethernet interface needs to be included
only in the specific VLAN, just as you would include a host port. For example, if you need only two
VLANs, configure these VLANs on the switch and add each to one of the internal interfaces. Access
the Catalyst 4000 Layer 3 Services module console and add each Catalyst 4000 Layer 3 Services
module interfaces to its respective VLAN. Assign an IP (or IPX) address to the corresponding Catalyst
4000 Layer 3 Services module routed interface (GigE3 or GigE4).
To provide Layer 3 gateway services for more than one VLAN on a Catalyst 4000 Layer 3 Services
module Gigabit Ethernet interface, you must use VLAN trunking. You can use the 802.1Q VLAN
trunking method to create the trunk between the Catalyst 4000 Layer 3 Services module interface and
the switch.
Configuring the Layer 3 Services Module Gigabit Ethernet
Interfaces
You cannot configure the internal Gigabit Ethernet interfaces as administratively down.
Note
To configure a Catalyst 4000 Layer 3 Services module Gigabit Ethernet interface, follow these steps:
Use the configure terminal EXEC command at the privileged EXEC prompt to enter global
Step 1
configuration mode.
4232-L3> enable
4232-L3# configure terminal
4232-L3(config)#
From the global configuration mode, enter the interface command, followed by the interface type (in
Step 2
this case, Gigabit Ethernet) and its interface port ID.
4232-L3(config)# interface g3
4232-L3(interface-if)#
Follow each interface command with the interface configuration commands required for your
Step 3
particular interface.
The commands you enter define the protocols and applications that will run on the interface. The
module collects and applies commands to the interface command until you enter another interface
command, enter a command that is not an interface configuration command, or press Ctrl-Z to return
to privileged EXEC mode.
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
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