It has been successfully tested on Cisco Nexus 7000 and 5000.

Help:
$ ./check_cisco_nexus_mem.pl -h
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# ADEO Services #
##############################################
Usage:./check_cisco_nexus_mem.pl
-H (--hostname) Hostname to query - (required)
-C (--community) SNMP read community (defaults to public,
used with SNMP v1 and v2c
-v (--snmp_version) 1 for SNMP v1 (default)
2 for SNMP v2c
-k (--key) snmp V3 key
-p (--password) snmp V3 password
-u (--username) snmp v3 username
-V (--version) Plugin version
-h (--help) usage help

-i (--sysdescr) use sysdescr instead of sysname for label display
-w (--warning) warning threshold (%)
-c (--critical) critical threshold (%)

-d (--debug) debug level (1 -> 15)


Example usage:
./check_cisco_nexus_mem.pl -H 10.XX.XX.XX -C SnmpV1V2Community -v 2 -w 80 -c 90

The sysName is written on output but you can choose to display the sysDescr instead with -i (sysDescr give Cisco nexus model and firmware release).