Wired Intelligent Edge

Hi,

I'm trying to stack VSF 3 switches in ring topology but I don't know what is happening.

I have read some manuals but always explain how to stack 4 switches. My topology is like you can see in the attached png.

Do you know if it's possible? What am I doing wrong? Which configurations do I need in my scenario?

I'm start thinking that stack 3 switches with ring topology is not possible.

Many thanks in advance

Best regards

Roger

VSF is supported on 5400Rs and 2930Fs. So I take it you are using 2930Fs, since 5400Rs can only support two members. So th ring stack topology is supported.

First ensure that these three switch's have nearly the same firmware version like 16.05.xx to 16.08.xx, if the gap is lareger the you could possibly have issues.

Then start with the switch that will be stack commander or the first switch

usse these commands

vsf enable domain 1  <<<<< this will reboot the switch

then add these commands

vsf member 1 link 1 1/49,1/50

vsf member 1 link 2 1/51,1/52

Now you need to connect the VSF link for the second switch and power it up. It could reboot once more to sync the images if they are running different verison. 

Since you have 3x switches in stack add this command to the second switch.

vsf member 2 link 2 2/49,2/50

When the third member is added to the VSF fabric, ensure to connect its second VSF link to the second link on member 1 to complete the ring formation.

Also note that best practices suggests to mitigate the effects of a VSF split, with Multi-Active Detection (MAD) feature that needs to be configured.

Hi!

Many thanks for your update. It worked. I did it a little bit different, following the Automatic VSF procedure that I font later. 

The way you suggested it's totally usefull in case we need to stack another switch that it's currerently in production.

Best regards,

Roger

Thats great.

regards

Hello I have tried to stack 3 device using this config but i did not find the error

vsf
enable domain 212
member 1
priority 255
link 1 1/47-1/48
link 1 name "I-Link1_1"
exit
member 2
priority 200
link 1 2/47-2/48
link 1 name "I-Link2_1"
exit
member 3
priority 150
link 1 3/47-3/48
link 1 name "I-Link3_1"
exit
port-speed 1g
exit

==========

The 3 memer always stay out of the stack. Maybe i need a second VSF link? But i cant waste  more than 2 port per swicht. Thankss!

Hi,

You need to change the link from 2 ports to 1 port (and add a second link)

Thanks for the reply now is working  i followed this way:

Swichts three member stack  connections:

1/47-2/48
2/47-3/48
3/47-1/48

==========

vsf

member 1
priority 255
link 1 1/47
link 1 name "I-Link1_1"
link 2 1/48
link 2 name "I-Link1_2"
exit
member 2
priority 200
link 1 2/47
link 1 name "I-Link2_1"
link 2 2/48
link 2 name "I-Link2_2"
exit
member 3
priority 150
link 1 3/47
link 1 name "I-Link3_1"
link 2 3/48
link 2 name "I-Link3_2"
exit
port-speed 1g

enable domain XXXXXXXXX