In today`s Voice over IP (VoIP) environment the final measure of network performance is provided by its users. A convergence of the network after the node failure in a traditional routing environment ... more
The April IP Corner article It’s good to be on time describes how you can use Network Time Protocol (NTP) to synchronize the real-time clock of your network devices with external time references. As s... more
Default routing should be a simple concept, but becomes surprisingly complex in routing protocols that have multiple layers of default routes. In this IP Corner article, Ivan Pepelnjak describes how t... more
If you want to deploy high-availability public servers within your network, you should implement proper multi-homing solution including BGP routing with the Service Providers. But even if you use alte... more
Network designers and implementers try to avoid policy routing, as its common implementation in Cisco IOS requires a complex mix of access-lists and route-maps that have to be deployed on a hop-by-hop... more
The importance of having accurate time on distributed servers and even personal workstations has been recognized long time ago by the IT managers, but it hasn’t been applied consistently to the networ... more
Border Gateway Protocol (BGP) was always considered a mastodonic routing protocol: huge, complex, hard to understand and configure, and very slow to converge. When Cisco decided to use it to implement... more
Contrary to common wisdom, OSPF is not a pure link-state protocol. It uses link state algorithms within an area, but behaves almost like a distance vector protocol between the areas. This distinction ... more
After years of struggles, the IP fragmentation remains one of the challenges in IP network deployment, particularly if you have to implement extra layers in the protocol stack (like PPP over Ethernet)... more