Python Script to find duplicate Cisco interface configs

dup_conf.py

import os

def print_dup_info(s):
	#split config on ! characters
	blocks = s.split('!')

	stanza_list = []
	interface_dict = {}
	for block in blocks:
		#get rid of blank lines and split each stanza into a list of lines
		if block == '\n':
			continue
		stanza_lines = block.split('\n')
		stanza_list.append(stanza_lines)
		
	for stanza in stanza_list:
		#remove empty items & descriptions
		stanza[:] = [item for item in stanza if item != '']
		stanza[:] = [item for item in stanza if not item.startswith(' description')]
		
		#push config into a dictionary with the interface config tuple as key
		#the value is a list of interface names; this way duplicate interface configs
		#get a list of interface names with duplicate configs
		
		# comment out next two lines to include SVIs
		if stanza[0].startswith('interface Vlan'):
			continue
		# comment out next two lines to include Gigabit interfaces
		if stanza[0].startswith('interface Giga'):
			continue
		if stanza[0].startswith('interface '):

			try:
				# append to dict value if it's already there
				interface_dict[tuple(stanza[1:])].append(stanza[0])
			except KeyError:
				interface_dict[tuple(stanza[1:])] = []
				interface_dict[tuple(stanza[1:])].append(stanza[0])
				
	for k,v in interface_dict.items():
		print "interfaces"
		print
		for item in v:
			print '\t' + item
		print
		print "are configured like"
		print
		for item in k:
			print item
		print 
		print '*'*50

		
filenames = [name for name in os.listdir('.') if name.startswith('c3750')]

for file in filenames:
	f = open(file)
	s = f.read()
	f.close()
	print "in config file " + file
	print
	print_dup_info(s)