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...

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...

OSPF Virtual Links

In an OSPF network, usually all areas need to be connected to the backbone area, area 0. There is a way around this though. Take a look at the topology above. Area 0 is...

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...
next-hop-self topology

When to Use BGP Next-Hop-Self

When beginning their CCIE studies, some people, including myself, wonder exactly when the next-hop-self option of BGP should be used. For this example we will use the topology above. Routers 1 and 2 have...

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...

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...

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