Unidirectional Link Detection (UDLD) is a Cisco proprietary extension that lives to detect miss-configured and broken links between Cisco switches. It verifies that they can both send and receive data on a point-to-point link. This can be used to assist spanning-tree and compliments things like …

So I have started looking at CCIE study and have been looking around to see what books and useful material exists out there. To begin with this list may be a little messy.I look to have been very lucky in that a number of these books (and more) my Dad actually got for me while he was working for …

To prevent loops that might develop if a port that should be blocking transitions to the forwarding state we have loop guard. This could happen if a port stops receiving BPDUs, maybe due to a unidirectional (on point-to-point) link or software/configuration problem on the neighbour. The following …

The IEEE (Institute of Electrical and Electronics Engineers) is a group that produced standards in many fields and industries. The mission statement; IEEE’s core purpose is to foster technological innovation and excellence for the benefit of humanity. The vision statement; IEEE will be essential to …

I have been using IOS for years but it would appear that a number of useful shortcuts fail to stick in my mind or did not know. As a result I thought I would note some of them so I have a quick lookup page. I am sure that this list will grow over time as I lab more and more and therefore am more …

As people have become more security concious with the transfer of data, in particular on the Enterprise/Corporate environments security teams are tightening down more and more on the use of insecure protocols. As a result the old favourites of TFTP/FTP etc are being removed. A number of replacements …

I guess a key part to studying for CCIE is to understand what devices and IOS versions you will be tested on in the lab. Thanks to Cisco they let you know this information; Version 4 makes use of; 1841 series routers – IOS 12.4(T) – Advanced Enterprise Services 3825 series routers – IOS 12.4(T) – …

The CCIE Routing & Switching blueprint can be see below, the topics that I have covered as part of my study will have hyper-links off to the corresponding post. This is very much work in progress so therefore is far from complete. [table id=4 /]

So I have started looking at CCIE study and have been looking around to see what books and useful material exists out there. To begin with this list may be sort but as I progress I am sure that the list will increase. I look to have been very lucky in that a number of these books (and more) my Dad …

So after putting off doing the TSHOOT (642-832) exam, my final one to gain CCNP, I finally booked and did it. In the end I found it relatively straight forward gaining a massive 100% (1000/1000). It was actually quite an enjoyable exam (if that is possible), consisting of a number of ‘trouble …