Gurusiddesh,

I’ll defer to the RFC authors on your question. However, please refrain from 
referring to bits as being “unset”. They are set or clear.

Thanks,
Acee

From: Lsr <[email protected]> on behalf of Gurusiddesh Nidasesi 
<[email protected]>
Date: Monday, April 19, 2021 at 6:13 AM
To: "[email protected]" <[email protected]>
Cc: Spencer Giacalone <[email protected]>, Stefano Previdi 
<[email protected]>, "Les Ginsberg (ginsberg)" <[email protected]>, Dona 
Maria John <[email protected]>, Vikram Agrawal 
<[email protected]>, Mahalakshmi Kumar 
<[email protected]>
Subject: [Lsr] Doubt regarding A bit set/unset

Hi All,

I had a query regarding setting/unsetting A bit.

https://tools.ietf.org/html/rfc8570#section-4.1 states that

A bit:  This field represents the Anomalous (A) bit.  The A bit is

      set when the measured value of this parameter exceeds its

      configured maximum threshold.  The A bit is cleared when the

      measured value falls below its configured reuse threshold.  If the

      A bit is cleared, the sub-TLV represents steady-state link

      performance.



So does it mean we have to have two configurations one for reuse and another 
for maximum threshold?

Will below example follow the RFC?

reuse threshold : 50 usec

maximum threshold : 100 usec

1st measured value : 110 usec

conclusion: Set A bit.



2nd measured value : 75 usec

conclusion : Do nothing (Maintain pervious state of A bit as the value is less 
than reuse or greater than threshold)



3rd measurement value : 30 usec

conclusion: Unset A bit.



 If we have to have two configuration for threshold to set/unset A bit, will 
they be different from the threshold that we use for advertisements?


Regards,
Gurusiddesh V N

.
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