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Network Redundancy Protocols

Redundancy is a common point for today’s topologies. Especially in mission-critical networks it is not acceptible that using only one gateway to reach a point. Because one gateway means single point of failure.

With multiple gateways, you can still reach the remote node even if the gateway that you connect fails. As soon as one of the gateway down, the link changes throught other gateway. Here with the word gateway, I mean the router that you use to reach a point, or with redundancy, multiply routers that you can use.

network redundancy, protocols for redundancy

Network Redundancy

Here, to connect one point to another, a virtual ip is used. For examle there are two routers that let you to connect another point. You build redundancy protocol based neighbourship with only one virtual ip. This virtual ip is also configured on these two routers. If any failure occurs, the traffic is routed from the failure way to the backup way.

There are some protocols for redundancy. These are :

HSRP (Hot Standby Router Protocol)
VRRP (Virtual Router Redundancy Protocol)
GLBP (Gateway Load Balancing Protocol)

Two of the protocols above, HSRP and GLBP is a “Cisco proprietary” protocol. You can use these only on Cisco devices.

Another protocol, the VRRP is a “standard based” protocol. you can use this protocol in all vendor’s devices, like Juniper and Alcatel-Lucent.

We will discuss three of these protocols with a lab example in the following articles.

So, keep on;)

Redundancy Protocols – Part 2 (HSRP)
Redundancy Protocols – Part 3 (HSRP Configuration)
Redundancy Protocols – Part 4 (VRRP)
Redundancy Protocols – Part 5 (GLBP)




About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

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