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Configuring a Redundant System

BIG-IP® Reference Guide 6-3

The bigpipe config sync all command synchronizes the following

configuration files:

•The common BIG/db keys

• All files in /config (except bigip_base.conf)

The config sync running command synchronizes the running version of

/config/bigip.conf, which is the image that resides in memory as the system

runs. This file is written only to memory on the standby unit, it is not saved.

Configuring fail-safe settings

For maximum reliability, the BIG-IP supports failure detection on both

internal and external VLANs. When you arm the fail-safe option on a

VLAN, the BIG-IP monitors network traffic going through the VLAN. If the

BIG-IP detects a loss of traffic on an VLAN when half of the fail-safe

timeout has elapsed, it attempts to generate traffic. A VLAN attempts to

generate network traffic by issuing ARP requests to nodes accessible

through the VLAN. Also, an ARP request is generated for the default route

if the default router is accessible from the VLAN. Any traffic through the

VLAN, including a response to the ARP requests, averts a fail-over.

If the BIG-IP does not receive traffic on the VLAN before the timer expires,

it initiates a fail-over, switches control to the standby unit, and reboots.

You should arm the fail-safe option on a VLAN only after the BIG-IP is in a

stable production environment. Otherwise, routine network changes may

cause fail-over unnecessarily.

Arming or disarming fail-safe on a VLAN

Each interface card installed on the BIG-IP is typically mapped to a

different VLAN, which you need to know when you set the fail-safe option

on a particular VLAN. You can view VLAN names in the Configuration

utility, or you can use the bigpipe vlan show command to view VLAN

names from the command line.

To arm or disarm fail-safe on an interface using the

Configuration utility

1. In the navigation pane, click Network.

The VLANs list opens and displays all VLANs.

2. Select a VLAN name.

The VLAN Properties screen opens.

3. To arm fail-safe, check Arm Failsafe.

4. To disarm fail-safe, clear the Arm Failsafe box.

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Dell 3-DNS Spezifikationen Seite 251