Serial Port Configuration
139
Command Purpose
Step 1
node
(frm-rel)[
slot
/
port
]#keepalive
number
Sets the LMI keepalive interval
To disable keepalives on networks that do not utilize LMI, use the
no keepalive
interface configuration
command.
Example: Configuring the Keepalive Interval
The following example sets the keepalive interval to 10 seconds for Frame Relay over the serial interface
on slot 0 and port 0 of a SmartNode 2300 series device.
SN(cfg)#
port serial 0 0
SN(prt-ser)[0/0]#
framerelay
SN(frm-rel)[0/0]#
keepalive 10
16.11 Enabling Fragmentation
The purpose of end-to-end FRF.12 fragmentation is to support real-time and non-real-time data packets
on lower-speed links without causing excessive delay to the real-time data. The FRF.12 Implementation
Agreement defines FRF.12 fragmentation. This standard was developed to allow long data frames to be
fragmented into smaller pieces (fragments) and interleaved with real-time frames. In this way, real-time
and non-real-time data frames can be carried together on lower-speed links without causing excessive
delay to the real-time traffic. End-to-end FRF.12 fragmentation is recommended for use on permanent
virtual circuits (PVCs) that share links with other PVCs that are transporting voice and on PVCs
transporting Voice over IP (VoIP).
Note:
The fragment size has to be set by changing the MTU of the associated IP interface.
Procedure
To configure end-to-end FRF.12 fragmentation
Mode
Frame Relay
Command Purpose
Step 1
node
(frm-rel)[
slot
/
port
]#fragmentation
Enables FRF.12 fragmentation
Example: Enabling Fragmentation
The following example sets the end-to-end FRF.12 fragmentation for Frame Relay over the serial
interface on slot 0 and port 0 of a SmartNode 2300 series device.
SN(cfg)#
port serial 0 0
SN(prt-ser)[0/0]#
framerelay
SN(frm-rel)[0/0]#
fragmentation
16.12 Entering Frame Relay PVC Configuration Mode
The permanent virtual circuit (PVC) is a virtual circuit that is permanently established. PVCs save
bandwidth associated with circuit establishment and tear down in situations where certain virtual
circuits must exist all the time.
Software Configuration Guide, Revision 1.03
The Frame Relay network provides a number of virtual circuits that form the basis for connections
between stations attached to the same Frame Relay network.