HDLC configuration command directory

debug hdlc

encapsulation hdlc

debug hdlc

Show the packet sending and receiving process of HDLCprotocol. Use command “no debug hdlc” to stop showing information.

[no] debug hdlc [packet | error] [interface]

parameter:

interface

To show the interface of HDLC debug information

packet

Enable the debug switch of HDLC sending/receiving packet

error

Enable the debug switch of HDLC error information

command mode:

supervisor mode

Explanation:

After turning on HDLC debug information switch, outputs HDLC receiving/sending packet and error information, helps the user in HDLC trouble diagnosis.

example:

The following example describes the situation when debugging HDLC receiving/sending packet:

Router#debug hdlc packet s1/2

Router#

Serial1/2 HDLC RX <- packet, len=64

0F 00 08 00 45 00 00 3C BE 4A 00 00 7F 01 B2 BD   ....E..<.J......

C0 A8 00 10 0A 00 00 01 08 00 19 5C 02 00 32 00    ...........\..2.

61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70   abcdefghijklmnop

71 72 73 74 75 76 77 61 62 63 64 65 66 67 68 69     qrstuvwabcdefghi

Serial0/2 HDLC RX <- link check frame, len=22

8F 00 80 35 00 00 00 02 00 00 00 33 00 00 00 C7   ...5.......3....

FF FF 00 00 0B DE                           ......

Domain

Description

HDLC

HDLCprotocol is currently debugged

Serial0/2

Current debug interface

RX <- packet

IP packet HDLC received

len=64

Length of packet received

0F 00 08 00 45 00 00 3C BE 4A 00 00 7F 01 B2 BD

C0 A8 00 10 0A 00 00 01 08 00 19 5C 02 00 32 00

61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70

71 72 73 74 75 76 77 61 62 63 64 65 66 67 68 69

The first 4 bytes are HDLC frame head, the rest are data

....E..<.J......

...........\..2.

abcdefghijklmnop

qrstuvwabcdefghi

ASCII code denotation of sent packet.

Those out of the denotation range of ASCII code are shown in “.”

RX <- link check frame

HDLC receives link check frame

len=22

Length of link check frame

8F 00 80 35 00 00 00 02 00 00 00 33 00 00 00 C7

FF FF 00 00 0B DE 

Hex system denotation of link check frame

...5.......3....

......

ASCII code denotation of link check frame.

Those out of the denotation range of ASCII code are shown in “.”

 

HDLC Serial0/2: TX -> packet, len=88

0F 00 08 00 45 00 00 54 00 07 00 00 FF 01 A7 9F   ....E..T........

0A 00 00 01 0A 00 00 02 08 00 00 03 00 0A 00 00   ................

00 01 02 E3 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F  ................

10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F  ................

HDLC Serial0/2: TX -> link check frame, len=24

8F 00 80 35 00 00 00 02 00 00 01 15 00 00 00 42   ...5...........B

FF FF 30 2E 33 B9 53 01                      ..0.3.S.

Domain

Description

HDLC

HDLCprotocl is currently debugged

Serial1/2

Current debug interface

TX -> packet

HDLC is sending IP packet

len=88

Length of sent packet

0F 00 08 00 45 00 00 54 00 07 00 00 FF 01 A7 9F

0A 00 00 01 0A 00 00 02 08 00 00 03 00 0A 00 00

00 01 02 E3 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F

First 4 bytes are HDLC frame head, rest are data

....E..T.......

................

................

................

ASCII code denotation of sent packet.

Those out of the denotation range of ASCII code are shown in “.”

TX -> link check frame

HDLC is sending link check frame

len=24

Length of the link check frame

8F 00 80 35 00 00 00 02 00 00 01 15 00 00 00 42

FF FF 30 2E 33 B9 53 01

Hex system denotation of link check frame

...5...........B

..0.3.S.

ASCII code denotation of link check frame.

Those out of the denotation range of ASCII code are shown in “.”

 

encapsulation hdlc

Encapsulate HDLC on the interface. No to cancel the encapsulation.

encapsulation hdlc

no encapsulation hdlc

parameter:

none

default:

none

command mode:

Interface configuration mode

Explanation:

Use “no” to cancel the encapsulation, yet return to the encapsulated HDLC mode.

example:

The following example configures HDLC encapsulation mode on serial s1/1:

interface s1/1

encapsulation hdlc