Configuration procedure

1. Enter system view.

system-view

N/A

2. Enter interface view.

interface interface-type interface-number

N/A

3. Configure the link layer protocol as LAPB.

link-protocol lapb [ dce | dte ] [ ip | multi-protocol ]

By default, the link layer protocol is PPP. When LAPB is configured, the interface operates as a DTE with the upper layer protocol as IP.

4. Configure the modulo.

lapb modulo { 8 | 128 }

Optional.

The default setting is 8.

To make the configuration take effect, re-enable the interface by using the shutdown and then undo shutdown commands.

5. Configure LAPB window parameter K.

lapb window-size k-value

Optional.

The default setting is 7.

6. Configure LAPB parameter N1.

lapb max-frame n1-value

Optional.

The default N1 is calculated according to the MTU, the upper layer protocol, and the modulus value.

You can configure this command only when LAPB carries the upper layer protocol X.25.

7. Configure LAPB parameter N2.

lapb retry n2-value

Optional.

The default setting is 10.

8. Configure the system timers T1, T2, T3, and T4 for LAPB.

lapb timer { t1 t1-value | t2 t2-value | t3 t3-value | t4 t4-value }

Optional.

By default:

• T1 is 3000 milliseconds.

• T2 is 1500 milliseconds.

• T3 is 0 seconds.

• T4 is 0 seconds.

9. Configure LAPB to initiate link renegotiation when receiving an unsolicited response frame with the Final bit set to 1.

lapb pollremote

Optional.

By default, LAPB does not initiate link renegotiation when receiving unsolicited response frames with the Final bit set to 1.

As likelihood exists that some response frames received with the Final bit set to 1 are falsely treated as unsolicited response frames, Hewlett Packard Enterprise recommends that you use the default setting to prevent link flapping caused by false link renegotiations that result.