AMX TXC32 Plus User Manual download pdf (Page 19)

TELDAT ROUTER - Frame Relay

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8. Backup Facilities over Frame Relay Interfaces

The possibility of doing a back up of the Frame Relay lines allows us to guarantee the transmission of

Frame Relay data when a fault is produced on the interface of the device or on the network lines.

There are two ways of performing a backup in the Frame Relay interfaces in the Teldat Router.

1. Backup from one PVC to another PVC (both from the same Frame Relay interface).

2. Backup from one Frame Relay interface to an ISDN interface.

The implementation of these two types of backup is associated with the seriousness of the problems

that may occur in communications on Frame Relay networks.

Through messages with LMI negotiation the network provides us with information about the state and

configuration of the PVCs available on a physical interface. Based on these messages we can detect

what type of problem we have on the network and switch to the type of backup required to continue

transmitting data.

At any time communications on a circuit can fall, either if they have been deleted by the network or if

they have become idle, which would mean that we are unable to continue transmitting frame through

this circuit. In order to guarantee that we can carry on sending and receiving the data that was directed

to this circuit (called the main circuit) we can associate it with another circuit (called the secondary or

backup circuit) through which data from the main circuit will be transmitted. The only requisite

needed to be able to perform a backup from PVC to PVC, which as we can see allows us to configure

pairs of PVCs so that if it is not possible to use the main PVC we are able to use the back up PVC to

maintain communications.

The second backup case is reserved for the most adverse situations, which basically consist of two.

On the one hand, it may be that the two configured circuits (the main one and its associated backup)

are not available at a specific time (a circumstance which can be deduced from the negotiation

messages), and on the other, the physical interface may fall. In either of these two cases we are unable

to carry on transmitting data through circuits configured on this Frame Relay interface. The solution

is to opt for an alternative back up network, which at the present time is the ISDN network.

In order to carry out this type of backup it is necessary to have configured the aforementioned ISDN

backup network, for this consult the relevant documentation on backup networks.

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AMX TXC32 Plus User Manual Page 19