344
0 frame errors
Output:633 packets, 7737 bytes
0 errors, 0 underruns, 0 collisions
0 deferred
DCD=UP DTR=UP DSR=UP RTS=UP CTS=UP
# Display information about interface Serial 2/0 on Router B.
[RouterB-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 10.1.1.1/8 Primary
Link-protocol is LAPB
LAPB DCE, 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 66, VR 112, Remote VR 66
IFRAME 240/194, RR 1/44, RNR 0/0, REJ 0/0
FRMR 1/0, SABM 0/3, DM 1/0, UA 1/0
DISC 0/0, invalid ns 0, invalid nr 0, link resets 1
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, Baudrate is 64000 bps
Interface is DCE, Cable type is V24, Clock mode is DCECLK
Last clearing of counters: Never
Last 70 seconds input rate 6.69 bytes/sec, 53 bits/sec, 0.10 packets/sec
Last 70 seconds output rate 0.30 bytes/sec, 2 bits/sec, 0.10 packets/sec
Input: 865 packets, 20440 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
0 frame errors
Output:861 packets, 17678 bytes
0 errors, 0 underruns, 0 collisions
0 deferred
DCD=UP DTR=UP DSR=UP RTS=UP CTS=UP
X.25 configuration examples
Direct connection of two routers connecting through serial
interfaces (one address mapping)
Network requirements
As shown in Figure 136, two routers are directly connected; IP packets can be transmitted between
serial interfaces over the X.25 link layer protocol. Only one IP to X.121 mapping is available on
Router A.
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