Posted on February 11, 2016 3:48 pm
 |  Asked by BSEARISTA BSEARISTA
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What is the difference between ptp priority1 and priority2 ?

What is its function ?

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Posted by nick
Answered on February 12, 2016 2:58 pm

PTP priority is one of the values advertised in PTP announce messages to determine the best master in a domain as per the BMCA process defined in the IEEE-1588 standard.  As per the EOS manual in chapter 5, section ”ptp”:

ptp priority1

The ptp priority1 command configures the priority 1 value for advertising the switch’s PTP clock. Priority 1 is the most significant of the six factors used by devices in the selection of a master clock. Lower values indicate higher priority.

ptp priority2

The ptp priority2 command sets the priority 2 value for the clock. The range is from 0 to 255. Priority 2 is the fifth most significant of the six factors used by devices in the selection of a master clock. Lower values indicate higher priority.

The no ptp priority2 and default ptp priority2 commands restore the priority 2 default setting of 128.

For future reference our current documentation is always available here:

https://www.arista.com/en/support/product-documentation

 

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