Archives
- August 2020 (1)
- October 2019 (2)
- September 2018 (1)
- June 2018 (1)
- April 2018 (3)
- January 2018 (2)
- December 2017 (3)
- August 2017 (2)
- July 2017 (1)
- February 2017 (1)
- January 2017 (5)
- September 2016 (2)
- January 2016 (1)
- November 2015 (1)
- September 2015 (2)
- October 2014 (1)
- April 2014 (1)
- March 2014 (2)
- December 2013 (1)
- November 2013 (1)
- October 2013 (3)
- September 2013 (2)
- July 2013 (3)
- May 2013 (2)
- March 2013 (2)
- February 2013 (2)
- January 2013 (1)
- December 2012 (5)
- November 2012 (5)
- October 2012 (4)
- September 2012 (3)
- August 2012 (7)
- July 2012 (8)
- June 2012 (2)
- May 2012 (2)
- April 2012 (4)
- March 2012 (1)
- January 2012 (1)
- December 2011 (1)
- November 2011 (1)
- October 2011 (2)
- September 2011 (1)
- August 2011 (3)
- July 2011 (4)
Tag Archives: IOS
Discovering a Cisco Network with CDP (Part 3)
This is part 3 of the series on network discovery using CDP. If you have not read the first or second parts you can find them HERE and HERE. So far we have looked at mapping the infrastructure with CDP as well as actually mapping hosts (by MAC address) to switch ports. I wanted to take the opportunity, in this write up, to step away from the Cisco command line and look at another product that leverages CDP: VMware. As you already know CDP is simply a packet emitted from physical ports of Cisco devices. Anything that cares to listen … Continue reading
Discovering a Cisco Network with CDP (Part 2)
Part one of this two part series talked about walking out your network with CDP. This is useful when all you need to know is the topology of the network equipment its self. The next step in the process is to map out where servers or other hosts are located. The first way of doing this would be to log onto the host, capture packets, and look for a CDP packet that indicates the switch name and port that the host is connected to. This would require packet capture software on each system and is really not practical. The second … Continue reading
Discovering a Cisco Network with CDP (Part 1)
If you have ever been dropped face first into an undocumented Cisco network with little Cisco experience you may have found yourself overwhelmed. Fortunately for admins who have no desire to tone cables or read long mac address tables there is a simple way to map out a network like this. The Cisco Discovery Protocol (CDP) is the answer. There are a few prerequisites but overall the process is fairly simple. First, CDP must be enabled on all of the devices and ports you would like to discover. This typically is the case as CDP is enabled by default on … Continue reading
Remote Cisco Router Change Safty Net
In the networking world you have a lot of opportunity to break things and take down entire buildings, WAN links, etc. Even less risky changes can result in a short break in connectivity while routing protocols re converge and so on. Because we often don’t have physical access to both sites while we are making WAN changes there has to be some type of worst case scenario prevention method. This is it: When making changes to WAN links in particular I always like to make the change to the far side first and obviously have to if there will be … Continue reading
Our RSS Feed