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For example, in an IP network, each subnetwork is mapped to an individual VLAN. In an IPX network,
each VLAN is mapped to an IPX network number.
VLANs help to control the size of the broadcast domain and keep local traffic local. However, when an
end station in one VLAN needs to communicate with an end station in another VLAN, interVLAN
communication is required. This communication is supported by interVLAN routing. You configure one
or more routers to route traffic to the appropriate destination VLAN.
This example shows you how would configure VTP on the Catalyst 4000 switch ports, create two
VLANs, and assign switch ports to those VLANs:
Console> (enable) set vtp mode server
VTP domain modified
Console> (enable) set vtp domain Corp_Net
VTP domain Corp_Net modified
Console> (enable) set vlan 100
Vlan 100 configuration successful
Console> (enable) set vlan 200
Vlan 200 configuration successful
Console> (enable) set vlan 100 3/1-12
VLAN 100 modified.
VLAN 1 modified.
VLAN
---- -----------------------
100 2/1-2
Console> (enable) set vlan 200 3/13-24
VLAN 200 modified.
VLAN 1 modified.
VLAN
---- -----------------------
200 2/1-2
Console> (enable)
Configuration Overview
The Catalyst 4000 Layer 3 Services module supports VLAN numbering from 1 to 1000.
Note
Each internal and external Gigabit Ethernet interface can be configured with a maximum
of 250 subinterfaces, each representing a VLAN interface.
You should view the Catalyst 4000 Layer 3 Services module as an external and internal router with two
full-duplex Gigabit Ethernet interfaces. The recommended configuration is to trunk or channel the two
Gigabit Ethernet interfaces. Another configuration option is to configure the interfaces independently.
The following sections describe the three options and the autostate feature which powers the
Catalyst 4000 Layer 3 Services module.
We recommend that you follow this sequence:
•
•
•
78-10164-03
Mod/Ports
3/1-12
Mod/Ports
3/13-24
Set the VTP domain for the Layer 2 ports. For information on how to do this, see the "Setting the
VTP Domain" section on page 46.
Configure the Layer 2 ports. For more information, see the "Setting the Layer 2 Port Speed" section
on page 48, and the "Setting the Layer 2 Port Duplex Mode" section on page 49.
Create VLANs. For more information, see the "Configuring VLANs" section on page 49.
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
Configuring the Module for InterVLAN Routing
45
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