Recover Cisco Switch Ports from err-disabled State
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How to view and recover Cisco Switch ports from err-disabled state Find out bandwidth used on Cisco Switch
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#show interface summary command provides bandwidth utilization of each Cisco switch interface, VLAN and port channels. You can either measure bits per sec using RXBS/TXBS fields or packets per sec using RXPS/TXPS fields. Additionally you also get to know counts of pkts dropped in the interface. .. 
UCCX: updating script caused error: Error while performing the operation. Please look into logs for more information.
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An error has occurred while saving a new UCCX script file in UCCX Publisher node. The message was “Error while performing the operation. Please look into logs for more information.“ If you encounter similar error, first identify the server roles, ensure they are properly set and finally try to apply ..
UCCX: Determine which server is currently the Master?
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In UCCX, there is no concept of Publisher/Subscriber, instead we have Master and Slave concept in UCCX. You can identify the role by following few steps. Login to each UCCX Server Navigate to Cisco Unified CCX Serviceability page Choose Tools > Control Center – Network Services menu Select the Server. ..
Cisco CUCM – Get User List Who have Logged into Phone
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As a Cisco CUCM administration, you may have to find out at some point of time, which users have logged in and to which Cisco phone. Here is how you can check. Login to CUCM Choose Devices > Phone Select ‘Actively Logged in Device Report’ from the drop-down list in the upper, right corner .. 
POE, POE+ vs UPOE: What’s the difference?
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You need to calculate the power requirements for all the powered devices that you plan to connect to switch. Also be careful while laying longer network cable, as some power is lost over the length of cable. Display debugging on ssh session or console
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To display Cisco debug output on the current SSH or Telnet session, switch# terminal monitor To turn off Cisco debug output switch# terminal no monitor To display Cisco debug output on the Console switch# logging console To turn off Cisco debug output switch# no logging console 
Upgrade Cisco WLC and Access Points to fix KRACK Attacks
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On Oct 16th 2017, 7 vulnerabilities affecting both WPA and WPA2 were made publicly available. Additional research also led to discovery of 3 additional vulnerabilities. Among these 10 vulnerabilities, only one CVE-2017-13082 may affect wireless infrastructure, the other nine vulnerabilities affect .. 
Cisco UCS C220M4 Purple Screen – Could not start pcpu 1: TSC sync timed out
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This happened today while setting up ESXi 6.5 on Cisco UCS C200 M4 Server. VMware crashed and throwing an error in the purple screen, Could not start pcpu 1; TSC sync timed out. If you come across similar situation, then try changing CPU settings in BIOS. It fixed the ESXi issue. Log in to BIOS […] 
How to setup Cisco ASA in High Availability Active/Standby Failover
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In a highly critical environment, we strongly recommend to setup Cisco ASAs in high availability mode. This way, if the Active ASA unit fails, the Standby unit takes over the role and becomes Active. Before we proceed, you need to ensure that following pre-requisites are met Both Cisco ASA units must ..