Syslog messages in network devices are crucial for monitoring, troubleshooting, and maintaining the health and security of the network infrastructure. These messages provide valuable information about the operation of the device, events, errors, and warnings. Understanding syslog messages is essential for network administrators to identify issues, track changes, and respond to events that may impact […] The post Syslog message and configuration, why it is so important appeared first on CiscoZine ..read more

Throubleshooting dot1x can be done via Cisco ISE GUI (generally more simple), but there are some cases where switch show commands can be useful and faster. My preferred are two: show authentication sessions You can find information like: Ciscozine-sw#sh authentication sessions Interface Identifier Method Domain Status Fg Session ID Gi1/0/15 98e7.f4be.ebcb dot1x DATA Auth 0A000A0B000002B91FBE82F2 […] The post Basic throubleshooting dot1x via CLI appeared first on CiscoZine ..read more

It’s a pleasure to announce that my blog has been nominated and approved to be a finalist in the 2021 IT Blog Awards, hosted by Cisco. Community voting will open today, January 10, 2022. If you have a couple mins, please vote for your favorite blog, for instance “Ciscozine” :) https://bit.ly/34EqRgb Thanks Winners will be […] The post Ciscozine finalist in the Cisco 2021 IT Blog Awards appeared first on CiscoZine ..read more

In a previous post, I explained how to configure dot1x in a switch global configuration. In this article, I’ll explain the best practice about dot1x interface configurations. If you do not know what are the benefits that dot1x framework gives, I suggest you to read this article. Let’s start :) First of all, define a […] The post 802.1X Deployment Guide: Interface configuration appeared first on CiscoZine ..read more

Normally, you need to upload the image to the controller and reset it to upgrade WLC/Aps; this causes the access point to go into discovery mode. After the access point discovers the controller with the new image, the AP downloads the new image, resets, goes into discovery mode, and rejoins the controller. This process is […] The post Predownloading an image to an access point appeared first on CiscoZine ..read more

Cisco Umbrella is a Cloud driven Secure Internet Gateway that provides protection from Internet based threats, for users wherever they go. As a cloud-delivered service, Umbrella provides the visibility needed to protect internet access across all network devices, office locations, and roaming users. Cisco Umbrella uses DNS to forward requests from your networks and users […] The post Configure Umbrella virtual appliance appeared first on CiscoZine ..read more

Few days ago, my customer called me for a strange wifi problem. When two or more devices with static IP address are bridged behind a wifi client adapter, only one of these devices can reach the network. Below a sketch that represents the current situation: From the wifi network perspective, sometimes the client .34 can […] The post How to allow multi IP address from the same wireless client appeared first on CiscoZine ..read more

Recently, I needed to send SPAN traffic to a network analyzer, but I had to resolve two problems: The network analyzer was installed on a virtual machine. I could not manage the virtual switch. For these reasons, I decided to send ERSPAN (Encapsulated Remote Switched Port Analyze) traffic directly to the virtual machine but a […] The post How to decapsule ERSPAN tunnel appeared first on CiscoZine ..read more

One year ago, Cisco published the Cisco ISE 2.7 release. Now, this release is the suggested one. It is possible to upgrade directly from release 2.2, 2.3, 2.4 or 2.6 and upgrading process can be done via GUI or CLI. This article will cover the easier method: upgrading Cisco ISE via GUI. Backup configuration Backup […] The post Cisco ISE 2.7 upgrade guide appeared first on CiscoZine ..read more

In the past, upgrade a switch was very easy: upload the IOS file (a .bin file), change the bootvar and reload the switch; then Cisco introduced the tar file using the “archive download-sw” command. The archive download algorithm checked that the image was appropriate for the switch model, that enough DRAM was present and that […] The post Upgrade Catalyst 9000 series appeared first on CiscoZine ..read more