HOW TO COMPARE STARTUP AND RUNNING CONFIG DIFFERENCE

When managing Cisco IOS network devices, administrators do come across occasions when they forget what recently they configured and then starts the tedious activity of comparing “show startup-config” and “show running-config”. The comparison activity in not only tiring, also may take long time to resolve. Let’s say a situation where only 1 hour of downtime is given by Business to perform a small change on Cisco device and atleast 30 minutes of critical time is utilized by administrator in comparing and finding what the changes were performed. Alas … indeed a nightmare.

So here is command which can address the comparison vows –


Show archive config differences”.
Below is example where the command is given and out is as below –
R1#show archive config difference
Contextual Config Diffs:
interface FastEthernet0/1
+no ip address
+shutdown
interface FastEthernet0/1
-ip address 192.168.12.1 255.255.255.0
-router eigrp 1
-network 192.168.12.1 0.0.0.0
-no auto-summary
 Note – In the above output, “+” sign refers to configuration present in “startup-config” while ““sign is for configuration part of “running configuration”. And Of course when we do a “write memory” after this and issue the command, no difference will be seen.
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