Spirent TestCenter: How to select a RANDOM payload?


Doc ID    KNI15956
Version:    2.0
Status:    Published
Published date:    03/17/2020
Created Date:    03/17/2020
 

Symptoms

How I can configure or select the packet payload as RANDOM in stream block editor -  I see only increment, decrement, PRBS, constant.

Environment

  • STC all versions
  • Streamblock payload

Explanation/Resolution

There is no specific option for RANDOM, however, when using payload fill as PRBS, generally speaking, the payload will be generated with a particular Algorithm depending on the pattern type (see below), so it looks like a truly random sequence. 

Depends on the card the pattern used, some cards (like MX3-100GQ-T2) uses PRBS pattern PRBS23, which is X^23 + X^18 + 1.So, in case that works for you, using PRBS payload (PRBS23) creates a payload that is not predictable.

Find attached a .pcap with 100 bursts of traffic being generated using PRBS payload

Attachment

payload_PRBS_100burst.pcapng
16K • < 1 minute @ 56k, < 1 minute @ broadband


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