Cisco Nexus – Ping Sweep

The following script can be utilized to execute a ping sweep of a /24 network on Cisco Nexus switch. This has been tested and verified on Cisco Nexus 7K running 6.2.8a code version.

Actual script:

for {set i 1} {$i < 255} {incr i} {
cli "ping 192.168.1.$i count 2 time 1 vrf VRF_A"

Script execution on a Cisco Nexus 7000 switch:

N7K_SW1# tclsh
N7K_SW1-tcl# for {set i 1} {$i < 255} {incr i} {  
> cli "ping 192.168.1.$i count 2 time 1 vrf VRF_A"
> }

Similar script but copy/pasting specific IP addresses:

foreach address {
> } { cli ping $address count 2 time 1 vrf VRF_A }

F5 – Automating CLI Execution

This is a really simple way to automate CLI command execution on multiple F5 devices using Bash & TCL scripting. The scripts have been tested on a linux and a mac machine.

How to use it:
There is a bash script (F5_Bash_v1) that is utilized to collect the username/password for F5 access. A text file (F5_Host.txt) that stores the management IP address of multiple F5 devices and a TCL script (F5_Out_v1.exp) that is used to execute CLI commands on the F5 devices.

The bash script is the master script that obtains the username/password and executes the TCL script for multiple F5 devices.

On a linux machine that is utilized to connect to the F5 device:

#Create a directory
mkdir F5_Check

Within the “F5_Check” directory, create the following 3 files:

File Content: F5_Host.txt contains the management IP of the F5 devices.

$ cat F5_Host.txt

File Content: F5_Bash_v1

# Collect the username and password for F5 access
echo -n "Enter the username "
read -s -e user
echo -ne '\n'
echo -n "Enter the password "
read -s -e password
echo -ne '\n'

# Feed the expect script a device list & the collected username & passwords
for device in `cat ~/F5_Check/F5_Host.txt`; do
./F5_Out_v1.exp $device $password $user ;

File Content: F5_Out_v1.exp

#!/usr/bin/expect -f

# Set variables
set hostname [lindex $argv 0]
set password [lindex $argv 1]
set username [lindex $argv 2]

# Log results
log_file -a ~/F5_Check/F5LOG.log

# Announce which device we are working on and the time
send_user "\n"
send_user ">>>>>  Working on $hostname @ [exec date] <<<<<\n"
send_user "\n"

# SSH access to device
spawn ssh $username@$hostname

expect {
"no)? " {
send "yes\n"
expect "*assword: "
sleep 1
send "$password\r"
"*assword: " {
sleep 1
send "$password\r"

expect "(tmos)#"
send "sys\n"
expect "(tmos.sys)#"

send "show software\n"
expect "#"
send "exit\n"
expect "#"
send "quit\n"

expect ":~\$"