Run mutiple iperf servers and clients

Hi all
I run several docker containers I need to run mutiple iperf servers and clients, I am using shell script.

I do not know can I write the script for all containers. it gives me error Error: No such container: mn.sta
for example for server I use

base_port=5000
NAME=$1

Command line input: number of servers

E.g. 5

num_servers=$1
shift

Command line input: base report file name

E.g. report

report_base=$1
shift

Optional command line input: other iperf options

E.g. -u

iperf_options=“$*”

Run iperf multiple times

for i in seq 1 $num_servers; do

# Set server port
server_port=$(($base_port+$i));

# Report file includes server port
report_file=${report_base}-${server_port}.txt

# Run iperf
docker exec -t mn.sta$NAME iperf -s -p $server_port $iperf_options &> $report_file &

done