All the info I was finding was a grepping of the VMX files (always locked/busy on my ESX6.5 environment) or needed a Windows vCenter to run a Powershell command, not available on the current VCSA.
I found this little gem at https://github.com/lamw/vghetto-scripts/blob/master/shell/vswitchInfo.sh and duplicated here (Sept 2017) in case the original goes missing…
# Author: William Lam
# Website: www.virtuallyghetto.com
# Product: VMware ESXi
# Description: Query MACs on internal vSwitch
# Reference: http://www.virtuallyghetto.com/2011/05/how-to-query-for-macs-on-internal.html
if [[ $# -ne 1 ]] && [[ $# -ne 4 ]]; then
echo -e “Usage: $0 -l -v [vSWITCH] -p [PORT]\n”
echo ” -l List all ports of vSwitch(s)”
echo ” -v vSwitch to query”
echo ” -p Port to query on vSwitch”
echo -e “\n\t$0 -l”
echo -e “\t$0 -v vSwitch0 -p 1234\n”
exit 0
fi
if [ ! -e /sbin/vsish ]; then
echo “Script is only supported running on an ESXi host as vsish is not available by default on ESX”
exit 1
fi
VSISH_VSWITCH_PATH=/net/portsets
if [ $# -eq 1 ]; then
for vSwitch in $(vsish -e ls ${VSISH_VSWITCH_PATH});
do
VSWITCH=$(echo ${vSwitch} | sed ‘s/\///g’)
for port in $(vsish -e ls ${VSISH_VSWITCH_PATH}/${vSwitch}ports);
do
PORT=$(echo ${port} | sed ‘s/\///g’)
PORTINFO=$(vsish -e get ${VSISH_VSWITCH_PATH}/${vSwitch}ports/${port}status | sed ‘s/^[ \t]*//;s/[ \t]*$//’);
CLIENT=$(echo ${PORTINFO} | sed ‘s/ /\n/g’ | grep “clientName:” | awk -F “:” ‘{print $2}’)
MACADDRESS=$(echo ${PORTINFO} | sed ‘s/ /\n/g’ | grep “unicastAddr:” | uniq | sed ‘s/unicastAddr://;s/\(.*\)./\1/’)
echo -e “${VSWITCH}\t${PORT}\t${MACADDRESS%%::*}\t${CLIENT}”
done
done
fi
if [ $# -eq 4 ]; then
QUERY_PATH=”${VSISH_VSWITCH_PATH}/${2}/ports/${4}/status”
echo “Querying port path: ${QUERY_PATH}”
PNICS=$(vsish -e ls /net/portsets/${2}/uplinks/ | sed ‘$!N;s/\n/ /;s/\///g’)
echo -e “pNICS for vSwitch: ${PNICS}\n”
vsish -e get “${QUERY_PATH}”
fi
