Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 36)

ServerIron ADX Firewall Load Balancing Guide 25

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Configuration examples with Layer 3 routing support

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Configuration examples with Layer 3 routing support

This section shows examples of commonly used ServerIron ADX basic FWLB deployments with

Layer 3 configurations. The ServerIron ADXs in these examples perform Layer 3 routing in addition

to Layer 2 and Layer 4–7 switching.

Generally, the steps for configuring Layer 4–7 features on a ServerIron ADX running Layer 3 are

similar to the steps on a ServerIron ADX that is not running Layer 3. The examples focus on the

Layer 3 aspects of the configurations.

This section contains the following configuration examples:

• “Basic FWLB with one sub-net and one virtual routing interface” on page 25

• “Basic FWLB with multiple sub-nets and multiple virtual routing interfaces” on page 31

Basic FWLB with one sub-net and one virtual routing interface

Figure 6 (IPv4) and Figure 7 (IPv6) show an example of a basic FWLB configuration in which each

ServerIron ADX is in only one sub-net. On each ServerIron ADX, a virtual routing interface is

configured on all the ports in VLAN 1 (the default VLAN), and an IP sub-net address is configured on

the virtual routing interface.

The ServerIron ADX supports dynamic routing protocols, including RIP and OSPF. However, some

firewalls do not support dynamic routing and instead require static routes. The network in this

example assumes that the firewalls do not support dynamic routing. Because the network uses

static routes, each ServerIron ADX is configured with an IP default route that uses one of the

firewall interfaces as the next hop for the route.

In addition, the client and server in this network each use a firewall interface as the default

gateway. When this is the case, you need to do one of the following:

• Configure each ServerIron ADX with static MAC entries for the firewall interfaces. This example

uses the static entries.

• Configure the clients and servers to use the ServerIron ADX itself as the default gateway.

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 36