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Configuration Options
The port numbering for the external Gigabit Ethernet interfaces on the front panel is Gigabit Ethernet1
and Gigabit Ethernet2. The port numbering for the internal Gigabit Ethernet interfaces is Gigabit
Ethernet3 and Gigabit Ethernet4.
If the Layer 3 Services module is installed in slot 2, port 2/1 on the Catalyst switch side is connected to
interface Gigabit Ethernet3 on the Catalyst 4000 Layer 3 Services module side and port 2/2 to interface
Gigabit Ethernet4.
Figure 9 shows the internal interface connections when the Layer 3 Services module is installed in
slot 6 in a Catalyst 4003 switch.
Figure 9
Configuration Options
You have the option to configure the Catalyst 4000 Layer 3 Services module ports as trunks, as
EtherChannels, or as independent links. This section provides an overview of these three configuration
options. For detailed configuration information, see the "Configuring the Module for InterVLAN
Routing" section on page 44.
Option 1: Interfaces as Trunks (Recommended Option)
You can add Layer 2 ports to VLANs and group the VLANs into trunks. For the Layer 2 ports, you add
the ports, from the switch console, to VLANs and then configure the trunks on the internal interfaces.
When you enable trunking, you must configure a subinterface on the internal Layer 3 ports for each
allowed VLAN configured on the Catalyst 4000 Layer 3 Services module trunk. The subinterface
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
40
Internal Interface Connections
Catalyst 4003 and 4006 switch backplane
2/1
Internal connnections
Gig E-3
Catalyst 4003 and 4006 Layer 3 Services module
Gig E-1
External connnections
2/2
Gig E-4
Gig E-2
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