High-Availability
The complexity required for robustness, often goes against robustness
- Tony Mattke
- Design & architecture
- 3 min read
In the past few months we have seen major outages from United Airlines, the NYSE, and the Wall Street Journal. With almost 5,000 flights grounded, and NYSE halting trading the cost …
OSPF Graceful Shutdown
- Tony Mattke
- Routing
- 5 min read
Striving to reach that last 9? Looking for a way to increase your uptime while still being able to do maintenance on your network? Wish you could shutdown your OSPF neighbors like …
HSRP, VRRPd, and GLBP Compared
- Tony Mattke
- Routing
- 5 min read
In the world of first hop redundancy, we have plenty of choices. In order to make the right decision for your network you should know the basics regarding all three. The following …
Bidirectional Forwarding Detection
- Tony Mattke
- Routing
- 6 min read
Bidirectional Forwarding Detection (BFD) is a UDP-based protocol that provides fast (very fast!) routing protocol independent detection of layer-3 next hop failures. BFD can be …