10 Holiday Gifts For IT Nerds
If you're stumped about what to get your geeky colleague or loved one, check out our nerdy gift list.
Snippet: The story of the EFP
For a while now, the concept of EVC’s (Ethernet Virtual Circuits) and EFP’s (Ethernet Flow Points), has eluded me.
In this short post, i will provide you with a simple example of a couple of EFP’s. In a later post i will discuss the MEF concept of EVC’s.
As always, here is the topology i will be using:
Its a very simple setup. R1 connects to R2 through its G1 interface and connects to R3 through its G2 interface.
On R2 and R3, we have the very common configuration of using subinterfaces for the individual Vlan’s in question. Namely Vlan 10 for the connection between R1 and R2 and Vlan 20 between R1 and R3.
Here is the configuration of R2 and R3:
R2#sh run int g1.10 Building configuration... Current configuration : 98 bytes ! interface GigabitEthernet1.10 encapsulation dot1Q 10 ip address 10.10.10.2 255.255.255.0 end R3#sh run int g1.20 Building configuration... Current configuration : 98 bytes ! interface GigabitEthernet1.20 encapsulation dot1Q 20 ip address 10.10.10.3 255.255.255.0 end
Now on R1 is where the “different” configuration takes place:
R1#sh run int g1 Building configuration... Current configuration : Continue reading
BGP VPLS explained (Nokia & Juniper)
It may very well be that VPLS days are numbered and EVPN is to blame. Nevertheless, it would be naive to expect VPLS extinction in the near future. With all its shortcomings VPLS is still very well standardized, interop-proven and has a huge footprint in MPLS networks of various scale. In this post I will cover theory andArribem a Barcelona! Cloudflare’s 101st data center
Hola Barcelona! The land of Antoni Gaudí, Salvador Dalí, Ferrán Adriá and Lionel Messi is now also home to Cloudflare.
Located alongside the Mediterranean, Barcelona, is the capital of the autonomous community of Catalonia, the second-most populated municipality in Spain and the core of the fifth-most populous urban area in the Europe. Our data center in Barcelona is our 3rd in the Iberian Peninsula following our deployments in Madrid and Lisbon, our 28th in Europe, and 101st globally. This means not only better performance in Catalonia and Spain, but additional redundancy for European data centers. As of this moment, Cloudflare has a point of presence (PoP) in 7 out of Europe's 10 most populous urban areas, and with number 8 coming soon (all roads have been said to lead there…).
CC BY-NC-ND 2.0 image by Luc Mercelis
Cloudflare has connected to the Catalunya Neutral Internet Exchange (“CATNIX”). This raises the number of exchanges that Cloudflare is a participant in to over 150. As we expand our peering, more visitors get served locally. If you wish to connect with us at CATNIX (or any of our other locations) you can find our peering details on our PeeringDB profile.
Only a Continue reading
Reliability of Clustered Solutions: Another Data Point
A while ago I wrote:
I haven’t seen any hard data, but intuition suggests that apart from hardware failures a standalone firewall might be more stable than a state-sharing firewall cluster.
Guillaume Sachot (working for a web hosting company) sent me his first-hand experience on this topic:
Read more ...Scoring the DNS Root Server System
The process of rolling the DNS Root’s Key Signing Key of the DNS has now started. During this process there will be a period where the root zone servers’ response to a DNS query for the DNSKEY resource record of the root zone will grow from the current value of 864 octets to 1,425 octets. Does this present a problem? Let’s look at the DNS Root Server system and score it on how well it can cope with large responses. It seems that awarding stars is the current Internet way, so let’s see how many stars we’ll give to the Root Server System for their handling of large responses.SC16 live real-time weathermaps
From the SCinet web page, "The Fastest Network Connecting the Fastest Computers: SC16 will host the most powerful and advanced networks in the world – SCinet. Created each year for the conference, SCinet brings to life a very high-capacity network that supports the revolutionary applications and experiments that are a hallmark of the SC conference."
The real-time weathermap leverages industry standard sFlow instrumentation built into network switch and router hardware to provide scaleable monitoring of the SCinet network. Link colors are updated every second to reflect operational status and utilization of each link.
Connect to http://inmon.sc16.org/sflow-rt/app/OSiRIS-weather/html/ to see an animated diagram of the SC16 OSiRIS demonstration connecting SCinet with University of Michigan, Michigan State, Wayne Continue reading