We all know that having redundancy in our network is crucial. If one interface goes down, we should have another path of getting to the destination network, unknowingly to the customer. Your clients, customers, or users should not be aware of what is going on behind the scene; they may experience a hiccup, but that is all.
In networking, we could use three redundancy protocols that work on your routers or layer 3 switches, so if one of the links goes down, they would automatically switch over to the next layer 3 device and continue to transmit data.
I have outlined the protocol here, along with some questions that you need to ask yourself:
How fast can the fail over happen?
- How is the client aware to switch?
- What if a WAN link fails?
HSRP:
- Cisco only created 1994
- Uses, by default, hello timers of 3 seconds and a hold timer 10
VRRP (industry standard):
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