Networking Topology

gistfile1.txt

#!/bin/bash

#### Thank you once again Jamie Bainbridge for helping me with the script.
#### Requirements: yum install -y "graphviz eog" ; copy script into file and then execute, e.g: ./scriptname.sh
#### I've noticed it doesn't work too well in the new Fedora, but tested with Rhel 7
#set -x

echo "" > first.dot
InitPath=$(pwd)
EndPath="sos_commands/networking"
OutputFile="first.dot"
FirstNic=$(grep "scope global" ip_addr | awk   '{print $2}' | head -n 1)

# Enter some info about the server
HostName=$(cat ./hostname)


# Start printing out lines in graphwiz format
echo "graph example1 {" >> $OutputFile
echo "rankdir=LR;" >> $OutputFile

declare -a IpAddr=($(egrep "scope global" sos_commands/networking/ip_address|awk '{print $2}'|sort ))
# Print the Inner and Outer Loop of variables FirstRow and SecondRow

for i in ${#IpAddr[@]}
	do
	for j in ${IpAddr[@]}
	do
		printf  "\"$HostName\" -- "   	>> 	$OutputFile
		printf  "\"${j[*]}\"\n" 	>>	$OutputFile
	done
done


#Add the Main Ip address that points to the gateway

printf "\"$IpAddr\" -- " >>      $OutputFile
egrep "default via"  $EndPath/ip_route_show_table_all | awk '{print "\""$3"\"[label=Gateway]\n"}' >> $OutputFile

# Set a variable to a gateway
FirstRow=$(egrep "default via" $EndPath/ip_route_show_table_all |  awk '{print ""$3"\"\n"}') 

#Declare that variable into an ip neigh output
declare -a SecondRow=($(egrep REACH $EndPath/ip_neigh_show|awk '{print $1}'|sort ))

# Count the loop  and have a loop that iterates through the variable SecondRow
# Print the Inner and Outer Loop of variables FirstRow and SecondRow
for i in ${#SecondRow[@]}
	do
	for j in ${SecondRow[@]}
	do
		printf  "\"$FirstRow -- "			>> 	$OutputFile
		printf  "\"${j[0]}\"[label= $FirstNic,shape=box];\n " 	>>	$OutputFile
	done
done
echo "}" >> $OutputFile

#This is to create the graphwiz and then to view it.
dot first.dot -Tpng -o example1.png
eog example1.png


 #  Helpful site with graphwiz examples https://www.ibm.com/developerworks/aix/library/au-aix-graphviz/
 #  http://graphs.grevian.org/example
 #  http://www.tonyballantyne.com/graphs.html