
Configuring WAN Line Services
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LAPB Implementation on Bay Networks Routers
The implementation of the LAPB protocol differs among Bay Networks routers.
On the AN, ANH, ARN, and ASN routers, and BN
®
and LN
®
routers with the
Octal Sync link module, LAPB is implemented in software. For all other link
modules, LAPB is implemented in the hardware, and you cannot configure LAPB
line parameters.
Bay Networks routers use the services of LAPB to initialize the link between the
router and the local DCE device, and to frame X.25 data packets before
transmitting them to the DCE. X.25 uses the LAPB protocol at the data link
layer to
• Initialize the link between the DTE and the local DCE device
• Frame X.25 data packets before transmitting them to the DCE
The LAPB information field contains the X.25 packets. Once an X.25 packet
reaches the destination router, the LAPB protocol strips away the LAPB frame
and delivers the packet to the network layer for further processing. For detailed
information on X.25, refer to Configuring X.25 Services.
LAPB Parameters
This section describes how to edit LAPB parameters. Topics include
• Enabling or Disabling LAPB Services
• Setting the Station Type
• Setting the Maximum N1 Frame Size
• Setting the Window Size
• Setting the Control Field
• Setting the T1 Acknowledge Timer
• Setting the Sequenced Frame T2 Acknowledge Timer
• Setting the N2 Retry Count
• Setting the Link Setup Action
• Enabling or Disabling Test Exchange Identification (XID) Frames
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