343
[RouterA-Serial2/0] lapb window-size 127
[RouterA-Serial2/0] shutdown
[RouterA-Serial2/0] undo shutdown
2. Configure Router B:
# Enter interface view.
<RouterB> system-view
[RouterB] interface serial 2/0
# Assign an IP address for the interface.
[RouterB-Serial2/0] ip address 10.1.1.1 255.0.0.0
# Configure the link layer protocol of the interface as LAPB, and specify it to operate in DCE
mode.
[RouterB-Serial2/0] link-protocol lapb dce
# Configure other LAPB parameters.
[RouterB-Serial2/0] lapb modulo 128
[RouterB-Serial2/0] lapb window-size 127
[RouterB-Serial2/0] shutdown
[RouterB-Serial2/0] undo shutdown
The IP addresses of the two connected interfaces must be on the same network segment. If
they are not on the same network segment, configure a static route in between and make sure
the traffic control parameters of both sides are the same.
Verifying the configuration
# Display information about interface Serial 2/0 on Router A.
[RouterA-Serial2/0] display interface serial 2/0
Serial2/0 current state: UP
Line protocol current state: UP
Description: Serial2/0 Interface
The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Internet Address is 10.1.1.2/8 Primary
Link-protocol is LAPB
LAPB DTE, module 128, window-size 127, max-frame 12032, retry 10
Timer: T1 3000, T2 1500, T3 0 , T4 0 (milliseconds), IP-protocol
state CONNECT, VS 6, VR 0, Remote VR 6
IFRAME 0/6, RR 6/0, RNR 0/0, REJ 0/0
FRMR 0/1, SABM 3/19, DM 0/1, UA 0/1
DISC 0/0, invalid ns 0, invalid nr 0, link resets 0
Output queue : (Urgent queuing : Size/Length/Discards) 0/100/0
Output queue : (Protocol queuing : Size/Length/Discards) 0/500/0
Output queue : (FIFO queuing : Size/Length/Discards) 0/75/0
Physical layer is synchronous, Virtual baudrate is 64000 bps
Interface is DTE, Cable type is V24, Clock mode is DTECLK1
Last clearing of counters: Never
Last 300 seconds input rate 2.26 bytes/sec, 18 bits/sec, 0.19 packets/sec
Last 300 seconds output rate 2.54 bytes/sec, 20 bits/sec, 0.22 packets/sec
Input: 627 packets, 7462 bytes
0 broadcasts, 0 multicasts
0 errors, 0 runts, 0 giants
0 CRC, 0 align errors, 0 overruns
0 dribbles, 0 aborts, 0 no buffers
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