Monthly Archives: June 2014

Configuring EAP-TLS on WLC

*+-In this post we will see how to configure EAP-TLS on a wireless controller.It is assumed that you have a PC which has already installed certificates(User Certifcate & Root CA Certificate). You can learn how to do this by following

Posted in CCIE Wireless

CCIE Collaboration Lab Exam Topics

*+-The CCIE Collaboration Lab exam topics provided are general guidelines for the content likely to be included on the lab exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect

Posted in CCIE Collaboration

FEX port status is “Down,Incompatible-Topology”

*+-Sometimes some fex errors could be due to vPC issues, and it is not obvious about the actual cause:        Topology: dual homed Fexes with vpc Symptoms: 1. Fex fabric ports showed ” down NO SFP”,after shut/no shut

Posted in CCIE Datacenter


*+-Since WGB AP acting as client, it can be associated to any (Autonomous or Lightweight) other AP. In this post we will see how WGB associated with a CAPWAP AP. Here is the setup for this post (Note that CAPWAP

Posted in CCIE Wireless

Cisco router’s clock and Time Zone

*+-If a Cisco router boots up before you’ve configured a local time or network time source, it will display the date as March 1, 1993. Here’s an example: Router> show clock *00:01:10.415 UTC Mon Mar 1 1993 Router> This date’s

Posted in CCIE Collaboration

Enhanced vPC

*+-according to our release note 5.1: Enhanced vPC Support is from 5.1.3 onwards. The most important thing to remember about enhanced vpc is that you don’t need to assign a vpc number, the system will automatically assign one: configuration

Posted in CCIE Datacenter

WLC – Web Authentication

*+-Web Authentication or Web Auth is a layer 3 security method that allow client to pass DHCP  & DNS traffic only untill they have passed some form of authentication. This is greatly used in wireless guest access service where no

Posted in CCIE Wireless


*+-I was working on this customer issue last week where they added a new 7841 phone but it was not registering properly or should I say it was registering briefly before unregistering. Call Manager was which does not support

Posted in CCIE Collaboration

Cisco Nexus 5000/7000 FEX Topologies

*+-There seems to be some confusion on what the supported Nexus 7000/5000 FEX topologies are. The first section deals with the supported Nexus 5000/5500 FEX topologies. The next section will show the Nexus 7000 FEX topologies. The following topologies are

Posted in CCIE Datacenter

DMVPN Explained

*+-DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks. In short, DMVPN is combination of the following technologies: 1) Multipoint GRE (mGRE) 2) Next-Hop Resolution Protocol (NHRP) 4) Dynamic Routing Protocol (EIGRP,

Posted in CCIE Security