Category: Cisco
Cisco Catalyst 2960X keeps crashing
Yesterday evening I had to troubleshoot a Cisco Catalyst 2960X switch stack, which didn’t return to normal after a reboot. The following error message was visible on the console: Error: ASIC/PHY POST failed. Cannot continue. %Software-forced reload This error message is listed as a bug (CSCut90593) at Cisco.com. Cisco describes a very “good” workaround: the switch … Read More
Cisco WLC – HA SSO upgrade
“Is the upgrade procedure for a high-availability pair of Cisco Wireless LAN Controllers the same as the procedure for a single Cisco WLC?” Several customers asked me this questions and the answer is YES. First you check the current and backup firmware image. (Cisco Controller) >show boot Primary Boot Image…………………………. 8.2.111.0 (default) (active) Backup Boot Image………………………….. … Read More
Cisco FMC – Dashboard Widgets
Some widgets on the dashboard don’t generate graphs after deploying a default configuration of Cisco FireSight Management Center. The first two widgets, Top Server Applications Seen and Top Operating Systems Seen, are generated after the configuration of a Network Discovery Profile. The configuration of the Network Discover Profile is done via Policies – Network Discovery – … Read More
Aruba Networks, Cisco, ClearPass
Aruba ClearPass – Cisco Prime – TACACS+
When using Cisco Prime you have the option to configure authentication to a remote AAA server via RADIUS or TACACS+. Today I configured Cisco Prime to use HPE Aruba ClearPass as remote AAA server based on the TACACS+ protocol. The configuration of an AAA server in Cisco Prime is very straightforward. Configure the AAA Mode … Read More
Cisco ASA: multiple context and capture
Packet captures are very useful for troubleshooting purposes. The Cisco ASA supports packet captures even in multiple context mode. I normally configure packet captures on CLI level. This can be done by configuring an access-list to match the specific traffic you would like to capture. Add the access-list and the specific interface in a capture command. … Read More
Cisco IOS-XE 16.x
Cisco has release new IOS-XE software, called IOS-XE Denali 16.x. This software is available for Cisco ASR routers and Cisco Catalyst 3850/3650 switches. In the end IOS-XE Denali should be available for all switches. A good overview of Cisco Catalyst IOS XE Denali is explained in this Youtube video from Tech Field Day. Below you … Read More