Chat Cisco3650 Switch Stacking failure

in fact, the stack of switches is very simple, before the Cisco 3750 Series switches in the stack, as long as the connection of the stacking cable, power on, the switch automatically complete the stack. Now the Cisco 3650 Series switch is slightly different when stacking, the first step is to insert the stacking module, the second step is to connect the stacking cable, and then power on, complete the stack. 3650 The switch is not with a stack module by default and must be configured separately.

3650 The switch stacking method is as follows:

The physical connection of the switch stack is completed with the above three graphs.

Supposedly stacking up here even if it's over, the rest is just powering up, letting them do the stacking process automatically, but that's not the case. Sometimes God always likes to put one or two stones on your way, so that you either get tripped or let you fall.

Here we are tripped, two switches connected after the boot, under the console found that the switch pops up the following prompt:

Stack adapter authentication failed on stack port 1 on switch 1 * * *
Stack Adapter Auth Fail:sif_serdes_cable_eastbound

It is not hard to see the problem with the stacking module on Switch 1 's port1.

In order to verify this module problem, we have moved the stacking module on the port1 to the Port2, and then moved from the Switch1 to the SWITCH2, in short, where the module moved to report this error.

To this end, I also upgraded the switch system, the small version, the large version has been upgraded, but the problem is still ...

I found something on the internet that looked like me, but it's a hint.
Stack adapter authentication failed on stack Port 2 on switch 1 * * *
Stack Adapter Auth fail:sif_serdes_cable_westbound

One is east, one is west.

Later, we asked to send a new stack of modules to come, after the newly stacked module arrived at the scene, insert, connect, boot, stacking OK.

To view the switch stacking situation:

Switch#show switch
Switch/stack mac Address:28ac.9ef9.2700-local mac Address
Mac persistency Wait Time:indefinite
H/W Current
switch# Role Mac Address Priority Version State
-------------------------------------------------------------------------------------
1 Standby 28ac.9e81.d900 1 V04 ready
* * Active 28ac.9ef9.2700 1 V04 ready

To view the switch stack ports:

Switch#show Switch Stack-ports
switch# Port1 Port2
----------------------------
1 OK OK
2 OK OK
The stack was successful, and the problem was on that stacked module.

We pulled the stacking module down and watched it carefully, and there was a bit of a problem, as shown here:

Notice the part of the red box, yes, the little shrapnel there is different from the others. But why are you suggesting eastbound and westbound?

What about (left West, right East?) ）？ This is the only question I have! Ha ha...... Can only wait for other brothers to appear similar situation again to verify, at present did not find the relevant information.

But fortunately found the problem, solve the problem! A small module Let me waste a day of wasted time!

Here's a little digression: When a problematic stacking module is inserted on the switch, it will affect the normal boot of the switch, which needs attention!

Chat Cisco3650 Switch Stacking failure