Cisco ASA 9.4 – Policy Based Routing

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It has finally happened: policy based routing is available for the Cisco ASA platform. This comes about from the new version 9.4 of the ASA software. While a lot of the time policy based...
split-horizon

When to Disable EIGRP Split-Horizon

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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...

Cisco IP SLA and Redundant Links

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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...

OSPF Max-Metric

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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...

Latency Issues – IP Redirects

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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...

IP SLA and Cisco EEM

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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

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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...