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