Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 24)

ServerIron ADX Firewall Load Balancing Guide 13

53-1002436-01

HA FWLB topology

DRAFT: BROCADE CONFIDENTIAL

Failover

In active-active FWLB, if one of the ServerIron ADXs becomes unavailable, the other ServerIron ADX

takes over for the unavailable ServerIron ADX. The ServerIron ADXs uses the following parameter to

manage failover:

ServerIron ADX priority – You can specify a priority from 0 through 255 on each ServerIron ADX. The

ServerIron ADX with the higher priority is the default active ServerIron ADX. Specifying the priority is

required.

NOTE

If you specify 0, the CLI removes the priority. When you save the configuration to the startup-config

file, the sym-priority command is removed. Use this method to remove the priority. You cannot

remove the priority using the no sym-priority command.

NOTE

The priority parameter does not apply to active-active configurations. However, you must configure

the priority.

Router paths

IronClad FWLB configurations require paths to the routers in addition to paths to the firewalls. The

router paths are required so the ServerIrons can ping the router links to assess their health.

In IronClad FWLB configurations, the standby ServerIron ADXs block Layer 3 OSPF, IGRP, and RIP

traffic on the standby paths. This means that the ServerIrons block traffic between routers on

different sides of the firewalls if the traffic uses the standby paths. After a failover to a standby

ServerIron, the traffic pattern changes. The active ServerIron ADXs allow Layer 3 traffic between

routers to pass through the firewalls on the active paths, while blocking the Layer 3 traffic on the

standby paths.

NOTE

If you have configured a default route between the routers, the route will work only when the

ServerIron through which the route passes is active. If the ServerIron is in standby mode, the route

is blocked.

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 24