Failed stack cisco WS 3850-24P

[MarioAlanoca1591]

Hello Everybody,

I am having trouble stacking twoWS C3850-24P.
I get the following message:
*** stack cable authentication failed for cable inserted on stack port 1on switch 1 ***.

Could you indicate if they have had a similar problem?
I will appreciate your comments.

[Leo Laohoo]

This is a well-known issue.  What firmware is the stack running on?

[MarioAlanoca1591]

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 32 WS-C3850-24P 16.6.5 CAT3K_CAA-UNIVERSALK9
INSTALL

[Leo Laohoo]

Upgrade to the lasest 16.6.X and see if this improves things.

[MarioAlanoca1591]

We have detected one of the stacking cables is in trouble. We are going to
request the cable change from the provider.

Then we will test stacking.

[balaji.bandi]

Under this  "*** stack cable authentication failed for cable inserted on stack port 1on switch 1 ***."

is this a new installation or a working one that failed ?

if this new installation - Power off the device and re-insert the cable which side failing eastbound or westbound

Example: Stack Adapter Auth Fail: SIF_SERDES_CABLE_EASTBOUND

Still issue - then you hitting with BUG

RMA is the option.

[marce1000]

       - FYI : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo12056

 M.

[Mohsin Alam]

Try Reseat of stack cables

If doesn't help --> RMA 

## Make sure to mark post as helpful, If it resolved your issue. ##