OSPF LSA Types

OSPF is a commonly used IGP used in a wide range of enterprise environments. It uses its algorithm to determine the shortest path to the destination network address. This algorithm is based on the...
split-horizon

When to Disable EIGRP Split-Horizon

Within a properly configured network, one thing that is very important is loop prevention. A Network loop can bring a wide range of issues from misrouted traffic to physical effects on devices such as...

Latency Issues – IP Redirects

Sometimes, you may run into a situation where traffic enters a routed interface and then per the routing table, exits the same interface. For instance, take a look at the topology below: In that topology...

OSPF Max-Metric

It's nothing new that OSPF uses a system of calculating the cost of a route to determine the open shortest path first (OSPF). Sometimes users want to manipulate the path that traffic will take...

Cisco IP SLA and Redundant Links

In any enterprise environment, there is one thing that comes up a lot, and that is redundancy. Take the healthcare industry for instance. When you have patients needing medical care, you can't afford the...

IP SLA and Cisco EEM

There are a lot of networks that utilize redundant ISP connections for obvious reasons. The problem though, then a link goes down, there are times a route can remain in the routing table, this...

BGP Best Path Selection

This is a subject that is key to the core of BGP and is something that needs to understood from the start. It is essential to everything that you will study and work with...