• Author : Alexei Agueev


Config Sessions Tips

Description: You want to implement human error prevention, 4-eyes-principle, task separation and delegation in your network? Then read on. We’ll show you how you can delegate configuration preparation to the operators team, retaining the control to commit the submitted changes, and having a delayed roll-back as a safety network in case something went wrong. Please also refer to the article “How to keep last X startup configs” for further tips on config handling and versioning. User Management: Let’s create two roles: one for the Network Operations team, that is allowed to use “configure session” to prepare changes, but is not...
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Find the next free VLAN id

If you have a lot of VLANs to manage, finding unused, available VLAN ids can be a challenge. Here’s a short alias to do exactly that (with the help of our customer Mateusz Blaszczyk): alias next-vlan show vlan | awk -v a=`echo %1 ` '$1 ~ /[0-9]/ && $1==a { ++a }; END { print a }' alias next-vlan-h bash echo -e "\nUsage: next-vlan <STARTING-ID>\n\nWhere <STARTING-ID> is the VLAN id to start looking for unused VLAN ids\n"   Description: The script analyses the output of the “show vlan” command for consequently rising VLAN ids, starting with the given one. It...
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How to keep last X startup configs

If you would like to keep track of last 10 (or more, or less) configuration changes, here’s the event-handler code to do that: event-handler config-versioning    trigger on-startup-config action bash FN=/mnt/flash/startup-config; LFN="`ls -1 $FN.*-* | tail -n 1`"; if [ -z "$LFN" -o -n "`diff -I 'last modified' $FN $LFN`" ]; then cp $FN $FN.`date +%Y%m%d-%H%M%S`; ls -1r $FN.*-* | tail -n +11 | xargs -I % rm %; fi    delay 0 Description: Every time the startup config gets changed, this event handler will be executed (“trigger on-startup-config”). You could increase the delay, if you wish, but now it’s engaged immediately...
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