January 23, 2019

OSPF DR Election Process

OSPF is a routing protocol that is popular because of the compatibility between vendors, compared to EIGRP being a Cisco proprietary routing protocol. One major component of OSPF is the usa of...

5.3.a (i) HSRP, GLBP, VRRP

Overview In a business environment, there is something that is very valuable and a non-negotiable. That would be uptime. How do you achieve a great uptime? With redundancy. That is what this article will focus...

Cisco Router IPSec VPN Tunnel Lab (with Video)

This post will cover the creation of an IPSec tunnel between two Cisco routers. If you've ever done one of these on an ASA firewall for instance, you will notice right off the bat...

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...

BGP Route Filtering: Prefix Lists

Summary Next on the chopping block when it comes to filtering routes shared between BGP neighbors is a prefix list. There isn't anything confusing to this one, the name is pretty accurate. You are simply...

EIGRP Metric Calculation

Not going to lie, this post is for me. There is one small thing that I always forget when it comes to this formula that I will get to in a moment. The metric of...

HSRP Version 1 vs Version 2

HSRP, or hot standby routing protocol, is very commonly used in the networking world. It is a great solution for providing redundant gateways for a wide array of networks. Over time there have been...
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