26 CHAPTER 2: SWITCHING CONCEPTS AND NETWORK CONFIGURATION EXAMPLES
Integrating the
Layer 3 Module into
the Network
This section outlines the steps you need to take to integrate your Layer 3
Module into a network containing hosts, Layer 2 switches and other
routers.
Hosts include any PCs and servers on your network. Follow the steps in
the order indicated.
1 Decide how to divide your hosts into IP subnets.
2 Allocate a VLAN identifier (the 802.1Q VLAN identifier) to each of these
IP subnets.
3 Create these VLANs on each of your Layer 2 switches.
4 Select the IP addresses, from your IP subnet allocation, to use on the
VLAN interfaces on the Layer 3 Module.
To make it easier to remember which IP address belongs to the Layer 3
Module, reserve the .1 host address in each subnet for the router. For
example, in the network 192.168.168.0, the IP address 192.168.168.1 is
the router address and becomes the address assigned to the
corresponding Layer 3 Module.
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