Tutorial

Cisco EIGRP named, a better approach

The Enhanced Interior Gateway Routing Protocol can be configured using either the classic mode or the named mode. The classic mode is the old...

The power of prefix lists

Prefix lists are used in route maps and route filtering operations and can be used as an alternative to access lists in many route...

How to install Cisco ISE using USB or CIMC interface

In one of my last job activities, the customer has requested to reinstall the Cisco ISE appliance (SNS-3495). The first option, a DVD reader,...

How to access network devices via Radius server

Suppose you manage hundreds of Cisco devices; how can you connect and secure it against unauthorized access? You can use local username, but it...

DDNS: How to manage a device with a dynamic public IP

The DDNS aka Dynamic DNS is an old feature that several routers (non only Cisco devices) have implemented and, in some circumstances, it is very...

Nexus HSRP/VRRP active/active with vPC

In the article vPC aka Virtual PortChannel, I explained how vPC works and the benefits that it gives. However, there is another important feature...

vPC aka Virtual PortChannel

The vPC aka virtual Port Channel is a Cisco technology that presents both Nexus paired devices as a unique Layer 2 logical node to...

Using Cisco ISE API to write web interface

In the last three months, I was involved in a project concerning the migration of the authentication system (dot1x) from Cisco ACS to Cisco ISE...

SecureCRT: How to import sessions via CSV file

In my opinion, one of the best Telnet/Serial/SSH client is SecureCRT, that provides rock-solid terminal emulation for computing professionals, raising productivity with advanced session management...

Is static port channel a good idea?

During my CCIE R&S studies (CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1), I have discovered an unexpected behavior of the static...