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Making remote changes`5`5BOOKMOBIWy5x%h3CMOBIB%" @EXTHdColliniRoute ,Troubleshootingg

We've all done this. You start changing a config under an interface and boom, you're locked out. I hated calling a user and asking them to unplug the device and plug it back in. Over …

j'Fri, 19 Apr 2013 21:27:00 +0000pDhttp://www.packetpros.com/2013/04/making-remote-changes.htmlePacketprosf Copyright packetpros.comMaking remote changes

We’ve all done this. You start changing a config under an interface and boom, you’re locked out. I hated calling a user and asking them to unplug the device and plug it back in. Over the years I learned some things that helped prevent that.

In this example (just happened) I need to change the switch interface that connects to the upstream router. The switch has negotiated to 100/half while the router is 100/full. If I mess up nothing is reachable to the remote site. Oh yeah, and no one is there and the site is 400 miles away.

First I like to create a cut sheet of what the interface needs to be configured as.

interface gi1/0/40
speed 100
duplex full
spanning portfast
spanning bpduguard enable
switchport mode access

I then copy the cut sheet to the switches flash:

IT-SW-01#copy ftp: flash:
Address or name of remote host []? 192.168.50.109
Source filename []? att-fix
Destination filename [att-fix]? 
Accessing ftp://192.168.50.109/att-fix…
Loading att-fix 
[OK – 157/4096 bytes]

157 bytes copied in 1.075 secs (146 bytes/sec)

To get a warm fuzzy, double check that the cut sheet in flash is what we want.

IT-SW-01#more flash:att-fix
interface gi1/0/40
speed 100
duplex full
spanning portfast
spanning bpduguard enable
switchport mode access 

Looks good. Next we schedule a reload. If something goes sideways we need to the switch to reboot so we can get back in. This is of course service effecting (if it reboots) so be careful.

IT-SW-01#reload in 4
Reload scheduled in 4 minutes by packetpros on vty0 (192.168.50.109)
Proceed with reload? [confirm]
IT-SW-01#

Now lets send our cut sheet to the running config.

IT-SW-01#copy flash:att-fix runn
Destination filename [running-config]? 

157 bytes copied in 0.073 secs (2151 bytes/sec)
IT-SW-01#

We lose connectivity for 10-15 seconds, but if your cut sheet is correct it will come back with the correct configuration!

IT-SW-01#sh run int gi1/0/40
Building configuration…

Current configuration : 192 bytes
!
interface GigabitEthernet1/0/40
 switchport mode access
 speed 100
 duplex full
 spanning-tree portfast
 spanning bpduguard enable
end

When you’re all good cancel the reload.

IT-SW-01#reload cancel
IT-SW-01#


***
*** — SHUTDOWN ABORTED —
***

IT-SW-01#

I’ve done this with many configurations that would normally lock me out; interface configuration, passive-interface default on EIGRP, BGP changes, etc. I’ve never had to make a change where this didn’t work. Just make sure your cut sheet is exactly what you want. I usually create a base config change, enough to let me get back in. Once I’m back in I make any other changes that are required like adding bpduguard. If I mess up and it locks me out I still have that reload scheduled.

FLIS00 00 00 0800 4100 0000 00 00 00ff ff ff ff00 0100 0300 00 00 0300 00 00 01ff ff ff ffFCIS00 00 00 1400 00 00 1000 00 00 0100 00 00 0000 00 0f 4300 00 00 0000 00 00 2000 00 00 0800 0100 0100 00 00 003918400778