Configure Encapsulation to Cisco-HDLC

Action

To set the encapsulation on a T1 physical interface, follow these steps:

1. In configuration mode, go to the following hierarchy level:

[edit]

user@host# edit interfaces interface-name

2. Configure Cisco-HDLC:

[edit interfaces interface-name]

user@host# set encapsulation cisco-hdlc

3. Verify the configuration:

user@host# show

For example:

[edit interfaces t1-0/1/1:8]

user@host# show

encapsulation hdlc;

4. Commit the change:

user@host# commit 

For example:

[edit interfaces t1-0/1/1:8]

user@host# commit 

commit complete

5. Check the interface configuration

user@host# run show interfaces t1-2/1/0:20                         

Physical interface: t1-2/1/0:20, Enabled, Physical link is Up

  Interface index: 210, SNMP ifIndex: 173

  Link-level type: Cisco-HDLC, MTU: 1504, Clocking: Internal, Speed: T1, 
  Loopback: Local, FCS: 16,

  Mode: C/Bit parity, Framing: ESF

  Device flags   : Present Running

  Interface flags: Point-To-Point SNMP-Traps

  Link flags     : Keepalives

  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3

  Keepalive: Input: 39 (00:00:06 ago), Output: 0 (never)

  CoS queues     : 4 supported

  Last flapped   : 2004-05-20 21:46:27 UTC (00:14:28 ago)

  Input rate     : 16 bps (0 pps)

  Output rate    : 160 bps (0 pps)

  DS1   alarms   : None

  DS3   alarms   : None

  DS1   defects  : None

  DS3   defects  : None

  Logical interface t1-2/1/0:20.0 (Index 74) (SNMP ifIndex 213) 

    Flags: Point-To-Point SNMP-Traps Encapsulation: Cisco-HDLC

    Protocol inet, MTU: 1500

      Flags: None

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 10.10.1.1, Local: 10.10.1.2

What It Means

This command sets the interface encapsulation to the Cisco HDLC transport protocol. You must configure the interface with Cisco HDLC to ensure that the logical interface remains up in preparation for the ping test.