Configuring HDLC in AOS Quick Start Guide
High-Level Data Link Control is a Layer 2 protocol that facilitates data communications over T1, E1 and SHDSL interfaces.
Requirements
This guide assumes the physical interface has already been configured and is ‘Up’. For more information about configuring T1 or E1 interfaces consult the guide titled “Configuring T1 and E1 Interfaces in AOS”.
Software Requirements
- HDLC is available in AOS Version 9 and higher.
Hardware Requirements
- AOS Product with T1 or E1 Interface
- 1st Generation NetVanta 3200 / 3205 are not capable of using AOS 9 or higher, and therefore are not capable of HDLC
Information Requirements
- IP Address and Subnet Mask to be assigned to the HDLC Interface
Configuring via the Web Interface
1) Click “Physical Interfaces.”
2) Click on the interface that use HDLC encapsulation. (Example: T1 1/1)
3) Set the “Encapsulation Mode” to “HDLC”.
4) Click Apply.
5) Under “IP Settings,” set “Address Type” to “Static”.
6) Enter the appropriate IP Address and Subnet Mask.
7) Click “Apply”
Note: The Status of the HDLC interface is at the bottom of the HDLC configuration page.
Configuring via the Command Line Interface
Access the Command Line via the Console Port or Telnet. The following commands will configure HDLC encapsulation on a T1, E1 or SHDSL interface.
1) Enter Privileged Exec Mode and enter the enable password if prompted.
a. Syntax: enable
b. Hostname> enable
2) Enter Global Configuration Mode.
a. Syntax: configure terminal
b. Hostname#: configure terminal
3) Create the HDLC interface with a unique identifying number.
a. Syntax: interface hdlc <number>
b. Hostname(config)#: interface hdlc 1
4) Assign the HDLC Interface an IP Address.
a. Syntax: ip address <A.B.C.D> <subnet mask | /prefix-length>
b. Hostname(config-hdlc 1)#: ip address 192.168.0.1 255.255.255.0
5) Cross-connect the interface with a Layer 1 interface (T1 and E1 shown)
a. Syntax: cross-connect <number> <interface> <slot/port> [<tdm-group number] hdlc <hdlc number>
b. Hostname(config-hdlc 1)#: cross-connect 1 t1 1/1 9 hdlc 1
c. Hostname(config-hdlc 1)#: cross-connect 1 e1 1/1 9 hdlc 1
d. Hostname(config-hdlc 1)#: cross-connect 1 shdsl 1/1 hdlc 1
6) Enable the HDLC interface.
a. Syntax: no shutdown
b. Hostname(config-hdlc 1)#: no shutdown
7) View the status of the HDLC interface.
a. Syntax: do show interface hdlc <hdlc number>
b. Hostname(config-hdlc 1)#: do show interface hdlc 1
😎 Return to Privileged Exec Mode.
a. Syntax: end
b. Hostname(config-hdlc 1)#: end
9) Save configuration changes to Permanent storage.
a. Syntax: write
b. Hostname#: write
Example Configurations
T1 Interface:
interface t1 1/1
tdm-group 9 timeslots 1-24 speed 64
no shutdown
!
interface hdlc 1
ip address 192.168.1.1 255.255.255.0
cross-connect 1 t1 1/1 9 hdlc 1
no shutdown
E1 Interface:
interface e1 1/1
tdm-group 9 timeslots 1-31 speed 64
no shutdown
!
interface hdlc 1
ip address 192.168.1.1 255.255.255.0
cross-connect 1 e1 1/1 9 hdlc 1
no shutdown
SHDSL Interface:
interface shdsl 1/1
no shutdown
!
interface hdlc 1
ip address 192.168.1.1 255.255.255.0
cross-connect 1 shdsl 1/1 hdlc 1
no shutdown
