BGP AS-Override

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If you follow me on Twitter (@TheRoutingTable) you may have seen my tweet earlier this evening: https://twitter.com/TheRoutingTable/status/843549123517304834 This is because I was working on a CCIE MPLS lab earlier and forgot it again. Since this is...

BGP Aggregation and Suppress Maps

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Within BGP, there are sometimes situations where it is better to send a summary address advertisement instead of advertisements for multiple subnets. This is the same with BGP as it is with other routing...

Basic: Cisco DMVPN Lab

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Two of my areas I want to improve on the most when it comes to my CCIE R&S Studying are MPLS and DMVPN. I did labs on each today just configuring the basics and...

EIGRP and AF-Interface

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Within the realm of EIGRP, there are two different modes, classic and named. Classic is the usual version most people are used to where the protocol configuration starts with "router eigrp 123" or something...

DMVPN in a VRF Environment

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In the lab, I have been introducing vrf environments into everything that I do. MPLS was the tip of the iceberg and then from there, I started tonight going over DMVPN in a vrf...

OSPF LSA Types

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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...

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...