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3. Configuration Options
3-4 December 2002 9000-A2-GB31-00
LMI Behavior (continued)
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.
Net1-FR1_Follows_Port-2 – Reacts like the Net1-FR1_Follows_Port-1 selection, but for
Port-2 instead.
Rtr-S0_Follows_Port-1 – Brings LMI down on the network interface when LMI on Rtr-S0
goes down, disabling the network interface and deasserting its control leads. When LMI
on Rtr-S0 comes back up, the network interface is reenabled. The LMI state on the
network interface has no effect on the LMI state on Rtr-S0. That is, the network interface’s
LMI follows Rtr-S0’s LMI.
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-2_Follows_Net1-FR1 – Reacts like the Port-1_Follows_Net1-FR1 selection, but for
Port-2 instead.
Rtr-S0_Follows_Net1-FR1 – Brings LMI down on Rtr-S0 when LMI on the network
interface goes down, disabling Rtr-S0. When LMI on the network interface comes back
up, Rtr-S0 is reenabled. The LMI state on Rtr-S0 has no effect on the LMI state on the
network interface. That is, Rtr-S0’s LMI follows the network interface’s LMI.
All_Ports_Follow_Net1-FR1 – Brings LMI down on all user data ports when LMI on the
network interface goes down, disabling all ports and deasserting their control leads.
Allows LMI to come back up and reenables the ports when LMI comes up on the network.
That is, LMI on each port follows the network interface’s LMI. The state of LMI on the port
will not affect the state of LMI on the network interface.
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.
Port-2_Codependent_with_Net1-FR1 – Reacts like the
Port-1_Codependent_with_Net1-FR1 selection, but for Port-2 instead. The state of LMI
on the network interface will not affect the state of LMI on Port-1.
Rtr-S0_Codependent_with_Net1-FR1 – Brings LMI down on the network interface when
LMI on Rtr-S0 goes down (or LMI down on Rtr-S0 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.
Table 3-1. System Frame Relay and LMI Options (2 of 4)