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Let’s continue our journey toward two-switch data center. What can we do after virtualizing the workload, getting rid of legacy technologies, and reducing the number of server uplinks to two?
How about replacing dedicated storage boxes with distributed file system?
In late September, Howard Marks will talk about software-defined storage in my Building Next Generation Data Center course. The course is sold out, but if you register for the spring 2017 session, you’ll get access to recording of Howard’s talk.
Several years ago I wrote an article called The Elusive “access-class out” Command. My primary goal was to help CCNA students understand both the behavior of and placement of this command. My friend Anthony Sequeira done a great job in the video that is also shown in my original post. Today, I want to share another command and expand on there behavior.
For all of the demonstrations in this article, the following topology will be used. The router named iosv-2 will be the primary focus and the only place changes will be made.
Backing up for a moment, there are a couple of messages that might be displayed when an IOS device blocks outbound telnet or ssh sessions from the current exec session. These are demonstrated with a quick configuration of an transport output and access-class restriction.
//the first error is unique depending on //if ssh or telnet is being used iosv-2(config)line con 0 iosv-2(config-line)#transport output none iosv-2(config-line)#do telnet 192.168.0.3 % telnet connections not permitted from this terminal iosv-2(config-line)#do ssh -l cisco 192.168.0.3 % ssh connections not permitted from this terminal //now we can re-enable all the protocols //and demonstrate the other error message iosv-2(config-line)#transport input all iosv-2(config-line)#access-list Continue reading