Hello all,

While running vpp 19.01(on ubuntu 18.04), I have observed that occasionally 
nat-det-expire-walk which is supposed to run every 10 sec, does not run. This 
causes the expired sessions to pile up.

I am checking it by running the following command:

vppctl sh run | grep -E 'Name|nat-det-expire-walk' ; sleep 10 ; vppctl sh run | 
grep nat-det-expire-walk
Name State Calls Vectors Suspends Clocks Vectors/Call Perf Ticks
nat-det-expire-walk any wait 0 0 102683 1.15e8 0.00
nat-det-expire-walk any wait 0 0 102683 1.15e8 0.00

Usually, Suspends count will go up, as the nat-det-expire-walk runs and 
suspends itself, but if it stops running, this count will not increase.

I understand this version is no longer supported, and while upgrading might 
solve this issue, that's immediately not an option, but certainly on the cards.

Just checking if this is a known issue and if there is any fix. If not is there 
any means to manually restart or run this job? Any debug tip or command to 
understand why its not running is also most welcome and I can do it when it 
happens next.

X.
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