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If you carefully scrutinize my proposal and your statement leading to the error msg, you might find the mistake...

How about:

currentcyan=$(snmpwalk -v1 - c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.9.1.1)
currentcyan=${currentcyan##* }
maxcyan=$(snmpwalk -v1 -c public 192.168.0.20...

Assuming a recent bash: try using an array:
ARR=( $(snmpwalk -v1 -c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.8.1.1) )
echo ${ARR[${#ARR[@]}-1]}
1800

EDIT: or
echo ${ARR[-1]}
1800

Welcome to the forum.

It's usually good habit to also post the OS and shell versions of your system, the tools you prefer to achieve your goals, and, on top of the input samples, also some desired...