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Hostname of C3850 changed to a weird IP address after IOS upgrade

ab_ahmadi
Level 1
Level 1

I tried to upgrade my C3850 stack to the latest IOS-XE (16.6.6) and everything goes fine without any error.but after rebooting the stack , the hostname of the switches change to a weird ip address (188.92.184.163) !!! i am 100% sure that i didn't change the hostname accidentally by no mean . the hostname on the config file also changed so that is not only about running-config. that ip address was not even in my stack configuration and i double checked my terminal that i execute the upgrade command and everything was normal . any clue ???

that is my terminal log :

 

SUCCESS: Software provisioned. New software will load on reboot.
[1]: Finished install successful on switch 1
[2]: install package(s) on switch 2
--- Starting list of software package changes ---
Old files list:
Removed cat3k_caa-guestshell.16.03.07.SPA.pkg
Removed cat3k_caa-rpbase.16.03.07.SPA.pkg
Removed cat3k_caa-rpcore.16.03.07.SPA.pkg
Removed cat3k_caa-srdriver.16.03.07.SPA.pkg
Removed cat3k_caa-wcm.16.03.07.SPA.pkg
Removed cat3k_caa-webui.16.03.07.SPA.pkg
New files list:
Added cat3k_caa-guestshell.16.06.06.SPA.pkg
Added cat3k_caa-rpbase.16.06.06.SPA.pkg
Added cat3k_caa-rpcore.16.06.06.SPA.pkg
Added cat3k_caa-srdriver.16.06.06.SPA.pkg
Added cat3k_caa-webui.16.06.06.SPA.pkg
Finished list of software package changes
SUCCESS: Software provisioned. New software will load on reboot.
[2]: Finished install successful on switch 2
Checking status of install on [1 2]
[1 2]: Finished install in switch 1 2
SUCCESS: Finished install: Success on [1 2]
EDGE#reload
Reload command is being issued on Active unit, this will reload the whole stack
Proceed with reload? [confirm]Connection closing...Socket close.

Connection closed by foreign host.

Disconnected from remote host(EDGE) at 14:50:29.


Connecting to 1xxxxxx:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.

 


188.92.184.163>
188.92.184.163>

 

188.92.184.163#sh run | i 188.92.
hostname 188.92.184.163

3 Replies 3

Reza Sharifi
Hall of Fame
Hall of Fame

Is DNS enabled on the switch?

It appears that the switch was looking for hostname "EDGE" and since it could not find it, it changed it to an IP.

HTH 

Hello,

 

on a side note, the range 188.92.184.0/24 is reserved to internal infrastructure of Milano Teleport SRL in Italy. Is there any relation between your company and Milano Teleport ?

Hello guy.the mystery solved .we used object-group in our ACL (for PBR path optimization) to better manage the IP addresses that need special routing via BPR. the mentioned IP address was part of a large object-group and it look like the 16.6.6 don't support object-group !!! the command object-group is missing (no CLI command exist on 16.6.6) and for that reason when we upgrade from 16.3.7 to 16.6.6 all object-group flushed from the config and then some magic happened (thanks  cisco development teams) and put that IP address as hostname of switches !!!.

i am rolling back to 16.3.7 and add the missing object-group from backup file.

thank you guy and thank Cisco for removing object-group from 16.6.6 .

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