Check SONET HDLC Payload Scrambling

Purpose

If you find that payload scrambling is not enabled, you might want to enable or configure it because it provides better link stability when it is working.

Action

In the JUNOS command-line interface (CLI) operational mode, you can use one of the following two commands to check for SONET HDLC control payload scrambling:

user@host> show configuration interfaces | interface-name

or

user@host> show interfaces interface-name

Sample Output 1

user@host> show configuration interfaces so-0/0/0

encapsulation cisco-hdlc;

sonet-options {

    payload-scrambler;

}

unit 0 {

    family inet {

        address 9.0.0.2/32 {

            destination 9.0.0.1;

        }

    }

    family mpls;

}

Sample Output 2

user@host> show configuration interfaces so-0/0/0

encapsulation cisco-hdlc;

sonet-options {

    no-payload-scrambler;

}

unit 0 {

    family inet {

        address 9.0.0.2/32 {

            destination 9.0.0.1;

        }

    }

    family mpls;

}

Sample Output 3

user@host> show interfaces so-0/0/1

Physical interface: so-0/0/1, Enabled, Physical link is Up

  Interface index: 48, SNMP ifIndex: 114

  Link-level type: PPP, MTU: 4474, Clocking: Internal, SONET mode, Speed: OC3, 
Loopback: None, FCS: 32,

  Payload scrambler: Disabled

  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: 70627 (00:00:07 ago), Output: 70791 (00:00:08 ago)

  LCP state: Opened

  NCP state: inet: Opened, inet6: Not-configured, iso: Opened, mpls: 
Not-configured

  Input rate     : 78056456 bps (6504 pps)

  Output rate    : 78044840 bps (6503 pps)

  SONET alarms   : None

  SONET defects  : None

  Logical interface so-0/0/1.0 (Index 61) (SNMP ifIndex 118) 

    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP

    Protocol inet, MTU: 4470, Flags: None

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 192.168.50.0/30, Local: 192.168.50.1

    Protocol iso, MTU: 4470, Flags: None

What It Means

Sample output 1 shows that the SONET interface payload scrambling has been enabled.

Sample output 2 shows that HDLC payload scrambling has been disabled. If you use the show configuration or show configuration interfaces command, you must scroll to the particular interface for payload scrambling status.

Sample output 3 shows that payload scrambling has been disabled. To explicitly configure payload scrambling, see Configure SONET HDLC Payload Scrambling.