Paradyne 9123 manual Configuring Frame Relay and LMI for the System, LMI Behavior

Configuration

Configuring Frame Relay and LMI for the System

Select Frame Relay and LMI from the System menu to display or change the

Frame Relay and LMI options for the entire system (see Table 3-1).

Main Menu → Configuration → System → Frame Relay and LMI

To configure these options, Service Type on the Easy Install screen must be set to Frame Relay. See Configuring Frame Relay for an Interface to set an interface's frame relay options.

Table 3-1. System Frame Relay and LMI Options (1 of 3)

LMI Behavior

Possible Settings: Independent,

Port-1_Follows_Net1-FR1,

Net1-FR1_Follows_Port-1,

Port-1_Codependent_with_Net1-FR1

Default Setting: Independent

Configures the device to allow the state of the LMI to be passed from one interface to another, determining how the unit will handle a change in the LMI state. Sometimes referred to as LMI pass-through.

Independent ± Handles the LMI state of each interface separately so that the LMI state of one interface has no effect on the LMI state of another interface. Provides LMI Spoofing. This is the recommended setting when backup is configured, and for Network Service Providers (NSPs).

Net1-FR1_Follows_Port-1± Brings LMI down on the network interface when LMI on Port-1 goes down, disabling the network interface and deasserting its control leads. When LMI on Port-1 comes back up, the network interface is reenabled. The LMI state on the network interface has no effect on the LMI state on Port-1. That is, the network interface's LMI follows Port-1's LMI. Used at central sites, this setting is useful when the remote site router on the other end of the PVC connection can initiate recovery via a redundant central site when there is a catastrophic central site LAN or router failure. Not recommended for NSPs.

Port-1_Follows_Net1-FR1± Brings LMI down on Port-1 when LMI on the network interface goes down, disabling Port 1 and deasserting its control leads. When LMI on the network interface comes back up, Port-1 is reenabled and its control leads are reasserted. The LMI state on Port-1 has no effect on the LMI state on the network interface. That is, Port-1's LMI follows the network interface's LMI. This setting is useful if the router connected to Port-1 is used to initiate recovery when network failures are detected.

Port-1_Codependent_with_Net1-FR1± Brings LMI down on the network interface when LMI on Port-1 goes down (or LMI down on Port-1 when LMI on the network interface goes down), and allows LMI to come back up when LMI comes back on the other interface. That is, the LMI state for one interface is dependent on the other. Use this setting when backup is through the router instead of the unit. It is not recommended since it makes fault isolation more difficult.

9123-A2-GB20-10 July 2000 3-17