Lmi Types; Frame Relay Configuration On The Portmaster; Enabling Lmi - Lucent Technologies PortMaster 4 Configuration Manual

performance for your application. In most cases, ordering according to these criteria
provides service that is close to your port speed. The CIR is a guaranteed minimum
throughput, not a maximum limit. Port speed is the maximum limit.

LMI Types

The following Frame Relay terms relate to network management. The Frame Relay
specification supports automatic network status updates, which are exchanged between
adjacent devices in the Frame Relay network. These status updates are known as the
Local Management Interface (LMI). Two forms of LMI are available in the PortMaster:
Cisco LMI, which is commonly referred to as LMI, and ANSI T1.617 Annex D LMI,
which is commonly referred to as Annex-D.
Generally, your telecommunications provider offers three LMI options for your physical
circuit: LMI, Annex-D, or none. Because LMI exists only between your router and the
switch to which your physical circuit connects, it does not need to match what the
remote ends of your PVCs are using. However, your circuit LMI must match the
configuration on your PortMaster. Generally, Annex-D is recommended because it is a
more feature-rich and robust version of LMI.

Frame Relay Configuration on the PortMaster

You configure Frame Relay by selecting the Frame Relay protocol, setting the IP address
of the port, and specifying the DLCIs during the synchronous port configuration.
Alternatively, the PortMaster can discover DLCIs dynamically with LMI or Annex-D and
learn the IP addresses of the other routers through Inverse ARP if the other routers on
your Frame Relay cloud support Inverse ARP as specified in RFC 1490. In this
configuration, the PortMaster sends an LMI status request every 10 configurable seconds
by default. Every sixth request is a full status request, and the others are keepalives. In
this configuration, the port state is CONNECTING until it receives three replies from the
switch; then the port state becomes ESTABLISHED. After six unanswered requests, the
PortMaster resets the port.
Note – All synchronous ports require an external clock signal–either from the device to
which the PortMaster is connected or from the telephone company–to regulate the port
speed.

Enabling LMI

You can specify whether the PortMaster accepts Local Management Interface (LMI)
frames from the attached Frame Relay switch. If LMI is enabled on the switch, you must
enable LMI on the PortMaster. The default keepalive value is 10 seconds. However, if
your telephone company chooses another keepalive value, change this value as they
instruct you. Enabling LMI causes the DLCI list to be completed automatically. If the
attached switch uses an interval keepalive timer different from the Frame Relay default,
be sure the keepalive timer on the PortMaster matches that of the attached switch.
To enable LMI, use the following command:
Command> set W1 lmi Seconds
Using Frame Relay
Frame Relay Configuration on the PortMaster
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