Modifying Sonet Payload Scrambling; Verifying Sonet Payload Scrambling; Configuring The Encapsulation Type; Verifying The Encapsulation Type - Cisco ASR 1000 Configuration Manual

Configuration Tasks

Modifying SONET Payload Scrambling

SONET payload scrambling applies a self-synchronous scrambler (x43+1) to the Synchronous Payload
Envelope (SPE) of the interface to ensure sufficient bit transition density.
The default configuration is SONET payload scrambling disabled.
SONET payload scrambling must be configured to be the same on both ends of the POS link.
To modify SONET payload scrambling, use the following command in interface configuration mode:
Command
Router(config-if)# pos scramble-atm
To disable SONET payload scrambling, use the no form of this command.

Verifying SONET Payload Scrambling

To verify SONET payload scrambling, use the show interfaces pos privileged EXEC command and
observe the value shown in the "Scramble" field.
The following example shows that SONET payload scrambling is disabled for interface port 0 on the
POS SPA installed in subslot 0 of the SIP that is located in slot 2 of the Cisco ASR 1000 Series Routers:
Router# show interfaces pos 2/0/0

Configuring the Encapsulation Type

By default, the POS interfaces support High-Level Data Link Control (HDLC) encapsulation. The
encapsulation method can be specified as HDLC, Point-to-Point Protocol (PPP), or Frame Relay. The
encapsulation type must be configured to be the same on both ends of the POS link.
To modify the encapsulation method, use the following command in interface configuration mode:
Command
Router(config-if)# encapsulation 
encapsulation-type

Verifying the Encapsulation Type

To verify the encapsulation type, use the show interfaces pos privileged EXEC command and observe
the value shown in the "Encapsulation" field.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
13-8
Hardware is Packet over Sonet
Internet address is 10.0.0.1/24
MTU 9216 bytes, BW 622000 Kbit, DLY 100 usec, 
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive not set
Scramble disabled
Chapter 13
Purpose
Enables SONET payload scrambling.
Purpose
Specifies the encapsulation method used by the
interface, where:
• encapsulation-type—Can be HDLC, PPP, or
Frame Relay. The default is HDLC.
Configuring the POS SPAs
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