Ping

I saw a tweet from Jeremy stretch (@packetlife) the other day about showing the ping statistics in linux without stopping the ping command which I had never seen used before (I obviously should have RTFM :P).  After which @jmhuwe and @synteki chimed in with the windows and OSX equivalents as per the below, thanks!

Linux – CTRL + \

Windows – CTRL + Break

OSX – Control + t

 

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multiple spanning tree

Working on renewing my knowledge of multiple spanning tree, in the lab I have three switches in a triangle topology.  I have configured mst instance 23 and in this instance vlans 100-400 on Switch2 and Switch3, here I have also configured Switch2 as the mst root bridge for instance 0 and 23.

When I issued the show spanning-tree mst command, in the output I can see this odd reference to PVST:

From the above screenshot g0/0 is connected to Switch3 which is also running mst and g0/3 is connected to Switch1 which is not running mst.

After some searching on the internet I found the blog linked below which points out that the above output is simply indicating that g0/3 is a mst boundary port meaning that the switch which is connected to this port (Switch1) is not running mst.

http://i-networks.us/spanning-tree-mst-shr-boundpvst-tree/

Since this is the case Switch2 will generate and send a PVST bpdu on g0/3.  Note that I have configured mst root primary on Switch2 for both instance 0 and 23.

I also found an article on cisco.com which explains in detail how mst switches inter operate with non mst switches:

PVST Simulation on MST Switches

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Linux mint mate – adding task bar to secondary monitor

I was scratching my head trying to extend the task bar to my secondary monitor.  I needed to create another panel (right click -> new panel), drag it to the required monitor and then position it as I wanted (right click -> properties -> orientation).

Getting the open windows to show up in the task bar needed to be enabled also (on both the main and new task bar panels).  To enable this: right click -> Add to panel -> Search for “window list” and click add.

Now the panel on each monitor will display the applications/windows you have open on each monitor, they will even move between the task bars if you drag the windows between each screen.

I got my window list info from this blog:
http://qdosmsq.dunbar-it.co.uk/blog/2014/06/linux-mint-cinnamon-not-showing-programs-on-task-bar/

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