G'day rmagin,
Welcome to the monastery.
The message indicating a potential "runaway multi-line" is due to the chop() statement:
$ perl -ce 'chop ($status=\Q$snmpset $oid s $rtr.cfg\Q);'
Substitution pattern not terminated at -e line 1.
\Q escape sequences are terminated with \E (not another \Q) and are applied to strings (i.e. they're not standalone operators):
$ perl -ce 'chop ($status="\Q$snmpset $oid s $rtr.cfg\E");'
-e syntax OK
Take a look at quotemeta for a more complete description.
toolic may well be correct in suggesting you want `...` instead of \Q...\Q; however, you may also want to escape the ASCII non-"word" characters in the return value - something like this (untested) might do what you want:
$ perl -ce 'chop ($status = quotemeta(`$snmpset $oid s $rtr.cfg`));'
-e syntax OK
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