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Troubleshooting and FAQ

06.2018

Cisco WLC does not switch to newly added Radius server

Problem description I came across one of customer’s problem with Cisco wireless controller and 802.1x network. Radius service was driven by NPS (Microsoft Windows Radius). After setup of new NPS server customer configured the second Radius server on WLC swaping the radius server priority (on the first place under the WLAN Security -> Advanced tab […]

Author: Marcin Bialy
05.2018

Cisco AP can’t join the WLC controller… DTLS handshake failure.

The problem, network components and topology I recently faced the issue with AP join to vWLC. Cisco 2700 AP could not join to newly installed Cisco vWLC controller. Coleague asked me to take a look and explained the topology. The vWLC was located in Grandmetric DC Testing Labs whereas Cisco CAP-2700 was located at Grandmetric […]

Author: Marcin Bialy
04.2018

IPSec tunnel between Cisco IOS router and AWS VPC. Static VTI and crypto map with HSRP redundancy.

Recently i was asked to advise in the following scenario: VPN tunnel between AWS VPC and Cisco IOS routers on DC prem. Nothing sophisticated but: Two ISR 4k, HSRP VPN redundancy, legacy crypto maps in production (several working vpns) and Static VTI (AWS). Two Crypto structures sourced from one HSRP. I have put the results on blog.

Author: Marcin Bialy
04.2018

Troubleshooting FMC and Firepower Sensor communication

In this post we are going to focus on the scripts included in FTD and FMC operating systems that help to troubleshoot connections between FTD sensors and Firepower Management Center. As they are run from the “expert mode” (super user), it is better that you have a deep understanding of any potential impact on the […]

Author: Ivan Radev
04.2018

Dealing with Cisco Firepower Management Center (FMC) and Firepower sensor communication. Registration process.

This post should help you to understand the Firepower sensor registration in FMC process and uncover the communication specifics between firepower components. I will also give you some additional hints what to check to verify the registration. In order to make troubleshooting easier there will be dedicated troubleshooting post later on.   1. High level […]

Author: Ivan Radev
12.2016

Conflicting protocols specified by tunnel-group and group-policy

It is my pleasure to write the first in a series of post for the Troubleshooting and FAQ section of our Grandmetric blog. In this category we will publish bugs/issues, problem descriptions, handy troubleshooting techniques as well as answers for interesting questions. As Network Contractors and trainers, we have come across dozens of interesting problems that have been […]

Author: Marcin Bialy
05.2016

ISE GUI admin password expired

Hi, it is common situation, that ISE admins are not aware that the initial ISE admin password for GUI expires after 45 days after installation. This is the default behavior of ISE. It is worth to be aware of this setting and to remember to uncheck the Administrator Password Expire .. in Password Lifetime section.   […]

Author: Marcin Bialy
 

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