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3. Configuration Options
9000-A2-GB31-00 December 2002
3-5
LMI Behavior (9783 and 9788)
Possible Settings: Independent, Net1-FR1_Follows_Port-1,
Port-1_Follows_Net1-FR1, Port-1_Codependent_with_Net1-FR1
Default Setting: Port-1_Codependent_with_Net1-FR1
For units that support ATM, configures the state of LMI on Port-1 and the state of the ATM
link on the network interface to be passed from one interface to another.
Independent – Handles the state of each interface separately so that the LMI state of
Port-1 has no effect on the state of the ATM link on the network interface, and vice versa.
Net1-FR1_Follows_Port-1 – Brings down VCs cross-connected to Port-1 on the network
interface when LMI on Port-1 goes down, and sends F5 OAM cells on all network VCs
cross-connected to Port-1 DLCIs to alert the network and far-end device that frame relay
data can not be delivered through the device. When LMI on Port-1 comes back up, the
network VCs are also re-enabled. This setting is useful at a central site 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 down LMI on Port-1 when there is a physical failure
or ATM failure on the network interface. When the alarm on the network interface is
cleared, Port-1 is re-enabled and its control leads are reasserted. 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 – The LMI state for Port 1 and the Net1-FR1
interface are dependent on each other. If the LMI is down on either interface, the system
will bring the LMI down on the other interface. When the LMI is up on either interface, the
system will bring the LMI up on the other interface. When Port-1 LMI goes down, in
addition to bringing down the internal network frame relay link, the unit also sends
F5 OAM cells on all network VCs cross-connected to Port-1 DLCIs to alert the network
and far-end device that frame relay data can not be delivered through the device. Use this
setting when backup is through the router instead of the unit. Note that when the router is
disconnected, the NSP cannot access the unit using multiplexed VCs.
LMI Error Event (N2)
Possible Settings: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Default Setting: 3
Configures the LMI-defined N2 parameter, which sets the number of errors that can occur
on the LMI link before an error is reported. Applies to both the user and network sides of a
UNI.
1 – 10 – Specifies the maximum number of errors.
LMI Clearing Event (N3)
Possible Settings: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Default Setting: 1
Configures the LMI-defined N3 parameter, which sets the number of error-free messages
that must be received before clearing an error event. Applies to both the user and network
sides of a UNI.
1 – 10 – Specifies how many error-free messages it will take to clear the error event.
Table 3-1. System Frame Relay and LMI Options (3 of 4)