3Com Version 4.3 Failover Settings

Chapter12. Failover

•Goto the Failover Settings page and select the interface which should be directly connected to the other

TelecommutingModule as Dedicated interface to use. Check the Dedicated network to see that it doesn’t clash

withany of your internal networks.

•Pressthe Create new team button to create a new failover team with this Telecommuting Module as its ﬁrst

member.This will cause a reboot.

Tomake Telecommuting Module 2 (the standby unit) a member of the failover team, you have to connect to it using

theserial cable or console. See chapter 2, Installing 3Com VCX IP Telecommuting Module, for a thorough

descriptionon how to do this.

Logon from your terminal as admin and select 3. Become a failover team member. Select the same interface as

wasselected as Dedicated interface for Telecommuting Module 1. All existing conﬁguration will be removed and

theTelecommuting Module will reboot. It will then obtain its conﬁguration from Telecommuting Module 1.

Afterinstalling the Telecommuting Modules, you must also connect them properly. They must be located close to

eachother, as they will be connected in parallel to all networks.

Theinterface on Telecommuting Module 1 which was reserved for failover should be connected to the

correspondinginterface on Telecommuting Module 2 using a crossover TP cable. If you for example selected

NetworkInterface 2 as the Dedicated interface to use, you should connect Network Interface 2 on Telecommuting

Module1 with Network Interface 2 on Telecommuting Module 2.

Theother 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

connectedto the DMZ network. You can’t have a router between any pair of interfaces; they must be located on the

samelogical IP network.

Failover Settings

Here,you conﬁgure the Telecommuting Module to enable it to communicate with the other unit of the failover team.

Hereis also where you change type between a standalone Telecommuting Module and one which is a team member.

Forthe Telecommuting Modules in the failover team to be able to synchronize conﬁguration and check that the

otherunit is still functional, they need to communicate. The communication is sent over a dedicated interface on the

TelecommutingModule. This interface can’t be used for any other trafﬁc.

Selectthe interface to be used for communication with the other Telecommuting Module of the team. This interface

shouldbe connected to the corresponding interface of the other Telecommuting Module using a crossover TP cable.

Thefailover team needs a network to use for its communication. This network must contain at least four addresses

(onefor each Telecommuting Module, one network address and one broadcast address). You can dedicate a larger

networkif you like, but since the interfaces will be directly connected to each other, no more addresses will be used.

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