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Chapter 12. Failover
• Go to the Failover Settings page and select the interface which should be directly connected to the other
Telecommuting Module as Dedicated interface to use. Check the Dedicated network to see that it doesn’t clash
with any of your internal networks.
• Press the Create new team button to create a new failover team with this Telecommuting Module as its first
member. This will cause a reboot.
Telecommuting Module 2
To make Telecommuting Module 2 (the standby unit) a member of the failover team, you have to connect to it using
the serial cable or console. See chapter 2, Installing 3Com VCX IP Telecommuting Module, for a thorough
description on how to do this.
Log on from your terminal as admin and select 3. Become a failover team member. Select the same interface as
was selected as Dedicated interface for Telecommuting Module 1. All existing configuration will be removed and
the Telecommuting Module will reboot. It will then obtain its configuration from Telecommuting Module 1.
Connecting the Telecommuting Modules
After installing the Telecommuting Modules, you must also connect them properly. They must be located close to
each other, as they will be connected in parallel to all networks.
The interface on Telecommuting Module 1 which was reserved for failover should be connected to the
corresponding interface on Telecommuting Module 2 using a crossover TP cable. If you for example selected
Network Interface 2 as the Dedicated interface to use, you should connect Network Interface 2 on Telecommuting
Module 1 with Network Interface 2 on Telecommuting Module 2.
The other interface should be connected in parallel to the network on which the Telecommuting Module should
operate. If you configured Network Interface 1 to be on the DMZ, both Network Interface 1 interfaces should be
connected to the DMZ network. You can’t have a router between any pair of interfaces; they must be located on the
same logical IP network.
Failover Settings
Here, you configure the Telecommuting Module to enable it to communicate with the other unit of the failover team.
Here is also where you change type between a standalone Telecommuting Module and one which is a team member.
Dedicated interface
For the Telecommuting Modules in the failover team to be able to synchronize configuration and check that the
other unit is still functional, they need to communicate. The communication is sent over a dedicated interface on the
Telecommuting Module. This interface can’t be used for any other traffic.
The dedicated interface to use
Select the interface to be used for communication with the other Telecommuting Module of the team. This interface
should be connected to the corresponding interface of the other Telecommuting Module using a crossover TP cable.
Dedicated network
The failover team needs a network to use for its communication. This network must contain at least four addresses
(one for each Telecommuting Module, one network address and one broadcast address). You can dedicate a larger
network if you like, but since the interfaces will be directly connected to each other, no more addresses will be used.
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