I have a pair of Cisco C3850-48T switches which i have stacked together.
Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 56 WS-C3850-48T 03.06.04.E cat3k_caa-universalk9 INSTALL
2 56 WS-C3850-48T 03.06.04.E cat3k_caa-universalk9 INSTALL
Switch #2 (the Standby switch) appears to boot normally, and joins the stack as a "member".
Switch/Stack Mac Address : 006c.bc57.9a00 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 006c.bc57.9a00 15 V06 Ready
2 Member 042a.e2a7.9500 10 V06 Ready
After a few minutes, it is elected as the "Standby" and goes into "HA sync in progress" mode.
Switch/Stack Mac Address : 006c.bc57.9a00 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 006c.bc57.9a00 15 V06 Ready
2 Standby 042a.e2a7.9500 10 V06 HA sync in progress
However, the sync never completes, and after 30 minutes, the switch is removed from the stack, and reboots.
#show switch stack-ports
Switch# Port1 Port2
----------------------------
1 OK OK
2 OK OK
As you see the stacking cables are connected OK.
Sw#/Port# Port Status Neighbor Cable Length Link OK Link Active Sync OK #Changes to LinkOK In Loopback
-------------------------------------------------------------------------------------------------------------------
1/1 OK 2 50cm Yes Yes Yes 59 No
1/2 OK 2 50cm Yes Yes Yes 179 No
2/1 OK 1 50cm Yes Yes Yes 6 No
2/2 OK 1 50cm Yes Yes Yes 1 No
I am puzzled as to how to proceed to fix this HA sync failure :(
(The switches are at a remote location, so i do not have console access to them)
Has anyone seen this behaviour before ?
