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GRANT3779
Frequent Contributor

Stack Power - 3850s

Hi All,

I have 5 switches stacked and connected with stack power. I know you can only have 4 in a power stack so i was trying to create 2 stack profiles and put 3 switches in one power stack and 2 in the other.

I currently have the following -

 

sh stack-power
Power stack name: Power-2
    Stack mode: Power sharing
    Stack topology: Standalone
    Switch 5:
        Power budget: 685
        Low port priority value: 22
        High port priority value: 13
        Switch priority value: 4
        Port 1 status: Not connected
        Port 2 status: Not connected
        Neighbor on port 1: 0000.0000.0000
        Neighbor on port 2: 0000.0000.0000

Power stack name: Powerstack-11
    Stack mode: Power sharing
    Stack topology: Ring
    Switch 4:
        Power budget: 280
        Low port priority value: 20
        High port priority value: 11
        Switch priority value: 2
        Port 1 status: Connected
        Port 2 status: Shut
        Neighbor on port 1: 0c68.0344.ea80
        Neighbor on port 2: 0000.0000.0000

    Switch 3:
        Power budget: 280
        Low port priority value: 19
        High port priority value: 10
        Switch priority value: 4
        Port 1 status: Connected
        Port 2 status: Connected
        Neighbor on port 1: 547c.6964.7100
        Neighbor on port 2: 0c68.0368.8580

    Switch 2:
        Power budget: 760
        Low port priority value: 21
        High port priority value: 12
        Switch priority value: 3
        Port 1 status: Connected
        Port 2 status: Connected
        Neighbor on port 1: 547c.6991.f780
        Neighbor on port 2: 0c68.0344.ea80

    Switch 1:
        Power budget: 760
        Low port priority value: 22
        High port priority value: 13
        Switch priority value: 1
        Port 1 status: Shut
        Port 2 status: Connected
        Neighbor on port 1: 0000.0000.0000
        Neighbor on port 2: 547c.6964.7100

 

I basically don't want to have one standalone switch. I tried the following below but didn't seem to achieve what i was after and I always seem to have one standalone switch. Does the physical cabling need to be amended as I have just followed the cisco doc when stacking the 5 together using stack power. For example Switch 1 Port 1 shows shut but when i enable this another one seems to shut on a different switch. Any ideas?

stack-power stack Power-1
stack-power switch 1 
stack Power-1
stack-power switch 2 
stack Power-1

stack-power stack Power-2
stack-power switch 3 
stack Power-2
stack-power switch 4
stack Power-2
stack-power switch 5 
stack Power-2 

4 REPLIES 4
trombidz1
Beginner

Hi

I am going to build a stack of 5 3850. Did you find examples on how to build such a stack ?

any best practices to share ? how did you cable them ? 

difficult to find something when the stack is more than 4 switches.

thanks for your cooperation.

 

regards

 

GRANT3779
Frequent Contributor

Hi,

What I done was first of all was before building the stack or connecting any cables draw out what switch will be what member number and the priority. 

I then configured this part on each of them individually ( for the numbering and priority commands).

When doing this, save the config and reboot.

Check the switch has the desired member number and priority using the show switch command then delete the old provisioning entry it has in the running config.
Commands to use at this stage are

switch x renumber x
switch x priority

Once happy, on the "master switch" provision the others via command line (again with switch not stacked at this point) e.g 

switch 1 provision ws-c3850-48p
switch 2 provision ws-c3850-48p
switch 3 provision ws-c3850-48t
switch 4 provision ws-c3850-48t
switch 5 provision ws-c3850-24p

I'm assuming you have the same software major version on each switches at this stage. I recommend running them in Install Mode also.

For the cabling - I followed this pattern but just add an extra switch..same for power.

http://www.cisco.com/c/dam/en/us/td/i/300001-400000/330001-340000/334001-335000/334340.eps/_jcr_content/renditions/334340.jpg

Some links below that helped me with the stack build from start to finish were -


https://supportforums.cisco.com/discussion/11924636/3850-stack-ios-upgrade

 

https://supportforums.cisco.com/document/12067331/3850-switch-ios-xe-upgrade-detailed-standalone

For the power - this was a great help - as you might not even realise that the stack ports are in a shutdown state.

http://www.ccierants.com/2011/08/configuring-stack-power-what-they-dont.html

 

thanks for your time and guidance, it is appreciated.

And at the end, did you keep your 2 power-stack ( one with switch 1,2,3 and one with switch 4 and 5  ) ?

Regards.

David

GRANT3779
Frequent Contributor

Hi David,

I did try to achieve this but that was after I had everything powered up / plugged in and had left site. I now believe that for the stack groups - you need to plan the power stack cabling between the switches so they connect up relevant to how you want to share the power. I just connected the power cabling in the same design as the stackwise and then tried to do the power groups remotely but the results I am getting are very strange and not what I was expecting.