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congestion-monitor
Enables the congestion monitoring feature. This feature allows a circuit’s
information rate to vary in response to congestion between the minimum
information rate and the line speed.
Note: The circuit monitoring feature overrides the congestion monitoring
feature if there is a conflict when both are enabled. The default
setting for this feature is enabled.
For additional information on congestion monitoring, see “Congestion
Monitoring” on page 400.
dn-length-field
Supports inter-operation with implementations of DECnet Phase IV over
Frame Relay that require a length field to precede DECnet packets in
Frame Relay frames. Enabling dn-length-field causes Frame Relay to insert
a length field into transmitted frames containing DECnet packets and to
remove the length field from received frames containing DECnet packets.
This option is disabled by default. By default, Frame Relay will neither insert
nor attempt to remove the length field.
Note: This option is presented as a configuration option only when the
router software contains the DECnet Phase IV protocol.
encryption
Enables encryption on the interface. All VCs that are configured as
encryption enabled, will encrypt all transmitted data.
lmi Enables management activity.
After issuing the enable lmi command, use the set lmi-type command to
select the management mode for your Frame Relay interface. See
“Enabling Frame Relay PVC Management” on page 403. The system
defaults to ANSI T1.617 Annex D management.
Use the enable lmi command to resume LMI management if you have
previously disabled Frame Relay management.
LMI only provides information about PVCs on an interface, so it does not
need to be enabled if only SVCs are used unless it is required by the
network. Q.922 determines the usability of all SVCs on an interface and is
an indicator of the state of the interface itself. When both PVCs and SVCs
are on an interface, LMI and Q.922 may be active at the same time.
lower-dtr
This parameter determines how the data terminal ready (DTR) signal is
handled for leased serial-line interfaces that are disabled. It is not supported
on Frame Relay dial circuit interfaces. If this parameter is set to “disabled”
(the default), the DTR signal will remain raised when the interface is
disabled.
When lower-dtr is enabled, DTR will be lowered when the interface is
disabled. This behavior may be desirable in situations where the interface
has been configured as an alternate link for WAN Reroute and the interface
is connected to a dial-out modem which maintains its dial connection based
on the state of the DTR signal.
If this feature is enabled and the interface is disabled, the DTR signal is low
and the modem keeps the dial connection down. When the interface is
enabled, due to a WAN Reroute backup scenario, DTR is raised and the
Configuring Frame Relay Interfaces
Chapter 31. Configuring and Monitoring Frame Relay Interfaces 417
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