One year ago today I passed the lab in Brussels! Time flies. That means I have one year to recert. My plan is to use the DE written to recert. Good luck to anyone pursuing the CCIE!
Network Campus Design
Introduction Modern networks need to be enabled for voice and video. These applications do not tolerate a lot of loss before quality becomes unacceptable. This requires us to build networks that are scalable, resilient and converge quickly. This post will
Detecting Network Failure
Introduction In todays networks, reliability is critical. Reliability needs to be high and convergence needs to be fast. There are several ways of detecting network failure but not all of them scale. This post takes a look at different methods
Scaling PEs in MPLS VPN – Route Target Constraint (RTC)
Introduction In any decent sized service provider or even an enterprise network running MPLS VPN, it will most likely be using Route Reflectors (RR). As described in a previous post iBGP fully meshed does not really scale. By default all
iBGP – Fully meshed vs Route Reflection
Intro This post looks at the pros and cons with BGP Route Reflection compared to running an iBGP full mesh. Full mesh Because iBGP routes are not propagated to iBGP sessions there must be a full mesh inside the BGP
BGP wedgies – Why isn’t my routing policy having effect?
Intro Brian McGahan from INE introduced me to something interesting the other day. BGP wedgie, what is that? I had never heard of it before although I’ve heard of such things occuring. A BGP wedgie is when a BGP configuration
Busting myths – PAgP desirable runs in silent mode by default
Time to bust another myth! Supposedly PAgP runs in silent mode by default in both desirable and auto mode. So what does silent mode do? “Use the silent mode when the switch is connected to a device that is not
RSTP synchronization – behind the scenes
RSTP synchronization is not widely understood and often oversimplified. This post describes how it really works in detail to give you the full picture.
Busting myths – Spanning tree portfast on the interface
I would like to bust a common myth. One that I’m probably guilty of preaching before as well. We all know that when portfast is enabled the port will bypass the listening and learning phase of STP. Portfast can be
I have been awarded the Cisco Learning Network Technical Excellence Award
Hi guys, Just a quick one. I’ve been awarded the Cisco Learning Network Technical Excellence Award for my contributions over there. It’s a great forum so you should check it out. Right now there are some webinars by members being