Have you ever heard about two new PoE enhancements that are available on some Catalyst 3850 and all Catalyst 9K platforms? If not, you’re not alone. I only found out about these few months back by accident when I was troubleshooting some issues. There are two great features available for you to configure on PoE-enabled switches:
Perpetual PoE: preserves power during warm reload
Fast PoE: provides power to the port after cold start at pre-outage levels
Cisco IOS archive feature supports two variables that can be used to define path property. Those are $t for date/time and $h for hostname. Date/time format can be adjusted with service timestamps log command. Also, don’t forget to configure an appropriate timezone name and offset. Here’s an example.
service timestamps log datetime localtime show-timezone year
clock timezone EET 2
clock summer-time EEST recurring last Sun Mar 3:00 last Sun Oct 4:00
You all know that fancy Mode button located on every single non-modular Catalyst switch (Cisco 3750/3560). It gives you a way to visualize switchports information – like duplex mode, speed, stack member, master switch, PoE status and so on. This magic button also provides you with the only available method to enter a recovery mode (if enable password had been lost). All these features are well known to any Cisco engineer – this is the basis of CCNA course that relates to L2/switches subject. Now, imagine another not-so-well-known feature which can put you in the middle of the nightmare… Continue reading →