Find Unique Interface Configs on Switches

Recently I needed to find all of the interfaces with non-standard configurations on a bunch of Catalyst 3750 switches. I wrote a simple Python script to automate the process. To run this, save it in a directory with all of the configurations you want to check. Then edit the name.startswith() section near the bottom to match the naming convention for your config files; in my case all of my configs start with "c3750". Then run the script from your CLI:

>python dup_conf.py

If you're on a Mac or Linux system, Python should be installed by default. On Windows, you'll need to install it or run Cygwin. Note that in the default version, the script ignores SVIs and Gigabit interfaces; uncomment the appropriate lines to include them.

The output looks like this:

in config file c3750-1A.txt

interfaces

interface FastEthernet1/0/35

configured like

switchport trunk encapsulation dot1q

switchport trunk native vlan 76

switchport mode trunk

switchport voice vlan 65

no logging event link-status

srr-queue bandwidth share 10 10 60 20

srr-queue bandwidth shape 10 0 0 0

mls qos trust device cisco-phone

mls qos trust dscp

auto qos voip cisco-phone

no mdix auto

spanning-tree portfast

**************************************************

interfaces

interface FastEthernet1/0/11

interface FastEthernet1/0/12

configured like

switchport trunk encapsulation dot1q

switchport trunk native vlan 80

switchport mode trunk

switchport voice vlan 65

srr-queue bandwidth share 10 10 60 20

srr-queue bandwidth shape 10 0 0 0

mls qos trust device cisco-phone

mls qos trust dscp

auto qos voip cisco-phone

no mdix auto

spanning-tree portfast

**************************************************

interfaces

interface FastEthernet1/0/1

interface FastEthernet1/0/2

interface FastEthernet1/0/3

interface FastEthernet1/0/4

interface FastEthernet1/0/5

interface FastEthernet1/0/6

interface FastEthernet1/0/7

interface FastEthernet1/0/8

interface FastEthernet1/0/9

interface FastEthernet1/0/10

interface FastEthernet1/0/13

interface FastEthernet1/0/14

interface FastEthernet1/0/15

interface FastEthernet1/0/16

configured like

switchport access vlan 64

switchport voice vlan 65

srr-queue bandwidth share 10 10 60 20

srr-queue bandwidth shape 10 0 0 0

mls qos trust device cisco-phone

mls qos trust dscp

auto qos voip cisco-phone

no mdix auto

spanning-tree portfast

**************************************************