Forming a Catalyst 3850 Data-Stack and Power-Stack is a process that involves a series of steps to ensure that your network is running efficiently and effectively. This article will guide you through the process, providing you with the knowledge and tools you need to successfully form a Catalyst 3850 Data-Stack and Power-Stack.
Requirements for Forming a Catalyst 3850 Data-Stack and Power-Stack
Before you begin, it’s important to understand the requirements for forming a Catalyst 3850 Data-Stack and Power-Stack. You’ll need more than two switches to form a switch stack. The IOS version used must be the same for all switches. You can configure software auto-upgrade on an existing stack to automatically upgrade newly added switches. All switches must use the same mode, either INSTALL or BUNDLE mode. Lastly, the correct type of cables must be used to achieve stack completion. Be aware that cables for the 3750 platform do not work on the 3850 platform.
The components used in this process include Cisco Catalyst 3850 switches, Cisco 3850 Stack wise cables, and Cisco 3850 stack power cables.
The process of connecting a stack of six 3850 switches, along with a power-stack connection example, is shown below. The process will be similar for stacks of 2,3,4,5,7,8, and 9 switches. Each switch has two stack-wise ports, let’s name the stack wise ports P1 and P2.
Adding a Switch to the Stack
When adding a switch to the stack, it’s important to note that the switch to be added must be off. Otherwise, the whole stack will reload. Add the new switch to the stack by connecting the stack cables to the switch. Once the stack-wise cables have been properly connected to the switch, power on the newly added switch either using the power supplies or the power-stack cables.
After the switch has come up, collect the following: show switch, show switch stack-ports, and sh version. On the show switch output verify that the current state of all switches is READY. On the show switch stack-ports verify that all the ports are shown as OK, that is an indication that the stack-wise cables are working properly. With the show version command, verify that all the switches on the stack have the same IOS version installed and that all of them have the same mode install or bundle.
There are several reasons why a stack might not form properly. This can be due to a cable not properly connected or to a faulty stack port on the switch. It can also be due to a version mismatch, make sure that all the switches on the stack have the same IOS image. The auto-upgrade feature can be configured so every time a switch is added to the stack this will be automatically upgraded to the IOS version used on the stack. It might also be due to a license version mismatch, verify that all the switches on the stack have the same license level.