Large multinational businesses require a campus network that shows high availability. This is that it’s perfect for the efficient and effective working of network access for many users. The particular high availability of a campus network is required because any downtown network can do the job of providing access to wireless access points, business applications, and phones.
One of the critical components of overall campus redundancy is the network switch power redundancy, as you’ll probably know by now that there are two kinds of the most commonly used power redundancy solutions for Cisco WS-C3850-48U-L switches. Still, just in case if you don’t, then the two solutions mentioned are known as partial redundancy and full redundancy.
Cisco WS-C3850-48U-L
The primary difference between them both is quite simple to understand or comprehend. The power redundancy solution where each switch is attached or attributed to up to two power supplies so that in the case where one goes down, the other can immediately take over or cover the urgency of that switch.
This system of how power redundancy occurs or takes place is also called 1:1 redundancy. And on the other hand, we look at the next option, which is called the particle redundancy, where there is an extra power supply for the use of multiple switches, this additional power supply is only one. This type of power redundancy solution is also known as the 1: N redundancy. The most popular of the two options in terms of usage can’t be just one because each comes with its shortcomings and benefits, but if we consider for the fact about which used the least, then it’s the full redundancy power supply solution.
This doesn’t mean that it is unsuccessful or there’s some fault with it. Still, it’s just that so many switches are coming for use nowadays that already come with a backup power supply that is perfect for use in ideal situations and conditions. Similarly, if we look at the partial redundancy power supply option, it’s not adopted in most places because of its incapability to come online. It takes time and might hinder some people when there is a time power failure takes place that might lead to a massive overall network outrage.
The booting-up of the Cisco StackPower Technology System
The booting-up of the Cisco IOS Software only starts when there is a certain amount of power budget available in the stack. But before all this happens, you’ll note that there is a whole process that has to go smoothly for the boot-up to occur. For this to happen, all the switches that are deployed in a power stack first find each other to send messages that are mainly about figuring out how much power is available in the power budget or the stack. After knowing this particular piece of important information, the priorities or priority value can be set straight. This is what initially happens before the start of the Cisco IOS Software.
Details in the sequencing of the budgeting
The following details will help provide you with an overview of what happens when we talk about budgeting:
The interconnection of the Cisco WS C3850 48U L switches is in the form of a ring topology. After the initial step, the power is supplied, or you can say it applied to the stack.
All of the Cisco StackPower infrastructure powers up, but initially, when the system’s power up and perform the topology, only every system’s infrastructure is required.
There is no single switch that doesn’t participate in the power stack and takes part in both exchanging messages on different kinds of information and swapping the power packets. The informational messages here actually refer to all the information about priorities and power resources.
Once every one of the steps takes place and is completed by the switches, the total Input Power is computed. It is done for the configuration of an Initial Unused Power number. Lastly, in this full process, the reserved power of 30W is subtracted once and for all for the complete power stack.
The priority to each other that each switch has is why the switches are brought up in the first place. Each switch does the work of decreasing the Unused Power by its maximum power amount.
The order in which the Cisco Catalyst 3850 switches are brought up for the above-given reason is irrespective of whether or not there is a PoE that requires a higher priority. This is because before any PoE is assigned, the switches are powered up already. Therefore, the importance that PoE might need is ignored only this time because if it isn’t ignored, then it would take a long time for the Power Stack to power up.
