C9800 v-mismatch

[vinar]

Hi,

Anybody who encountered v-mismatch error on the WLCs? We are trying to have HA configuration for C9800-L. Already checked the pre-requisites like same IOS version, etc but the error shows when the RP cable is connected. WLC2 uplink port will be DOWN and not accessible. 

See below for more information:

Thu Oct 19 2023 13:28:18 GMT+0800 (China Standard Time)

===================================================================================

#show chassis

Chassis/Stack Mac Address : f01d.2d39.d2a0 - Local Mac Address

Mac persistency wait time: Indefinite

Local Redundancy Port Type: Twisted Pair

                                             H/W   Current

Chassis#   Role    Mac Address     Priority Version  State                 IP

-------------------------------------------------------------------------------------

*1       Active   f01d.2d39.d2a0     2      V02     Ready                10.64.0.30    

 2       Member   f01d.2d39.7b60     1      V02     V-Mismatch           10.64.0.31

Thu Oct 19 2023 13:24:00 GMT+0800 (China Standard Time)

===================================================================================

#show redundancy

Redundant System Information :

------------------------------

       Available system uptime = 1 hour, 33 minutes

Switchovers system experienced = 0

              Standby failures = 0

        Last switchover reason = none

                 Hardware Mode = Simplex

    Configured Redundancy Mode = sso

     Operating Redundancy Mode = Non-redundant

              Maintenance Mode = Disabled

                Communications = Down      Reason: Failure

Current Processor Information :

-------------------------------

               Active Location = slot 1

        Current Software state = ACTIVE

       Uptime in current state = 1 hour, 33 minutes

                 Image Version = Cisco IOS Software [Dublin], C9800 Software (C9800_IOSXE-K9), Version 17.12.1, RELEASE SOFTWARE (fc5)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2023 by Cisco Systems, Inc.

Compiled Thu 27-Jul-23 22:41 by mcpre

                          BOOT = bootflash:packages.conf,12;

        Configuration register = 0x102

               Recovery mode   = Not Applicable

             Fast Switchover   = Enabled

                Initial Garp   = Enabled

Peer (slot: 0) information is not available because it is in 'DISABLED' state

Thu Oct 19 2023 13:27:23 GMT+0800 (China Standard Time)

===================================================================================

#show version

Cisco IOS XE Software, Version 17.12.01

Cisco IOS Software [Dublin], C9800 Software (C9800_IOSXE-K9), Version 17.12.1, RELEASE SOFTWARE (fc5)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2023 by Cisco Systems, Inc.

Compiled Thu 27-Jul-23 22:41 by mcpre

Cisco IOS-XE software, Copyright (c) 2005-2023 by cisco Systems, Inc.

All rights reserved.  Certain components of Cisco IOS-XE software are

licensed under the GNU General Public License ("GPL") Version 2.0.  The

software code licensed under GPL Version 2.0 is free software that comes

with ABSOLUTELY NO WARRANTY.  You can redistribute and/or modify such

GPL code under the terms of GPL Version 2.0.  For more details, see the

documentation or "License Notice" file accompanying the IOS-XE software,

or the applicable URL provided on the flyer accompanying the IOS-XE

software.

ROM: 16.12(3r)

BR-MR3-CORE-WLC-01 uptime is 1 hour, 36 minutes

Uptime for this control processor is 1 hour, 42 minutes

System returned to ROM by PowerOn

System restarted at 11:50:47 Singapo Thu Oct 19 2023

System image file is "bootflash:packages.conf"

Last reload reason: PowerOn

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

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agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

License Type: Smart License is permanent

License Level: adventerprise

Next reload license Level: adventerprise

AIR License Level: AIR DNA Advantage

Next reload AIR license Level: AIR DNA Advantage

The current crypto throughput level is 0 kbps

Smart Licensing Status: Smart Licensing Using Policy

cisco C9800-L-C-K9 (KATAR) processor (revision KATAR) with 1618471K/6147K bytes of memory.

Processor board ID FCL2604006E

Router operating mode: Autonomous

7 Virtual Ethernet interfaces

4 2.5 Gigabit Ethernet interfaces

2 Ten Gigabit Ethernet interfaces

32768K bytes of non-volatile configuration memory.

16777216K bytes of physical memory.

26251263K bytes of eUSB flash at bootflash:.

26251263K bytes of eUSB flash at bootflash-2:.

Base Ethernet MAC Address          : F0:1D:2D:39:D2:A0

Installation mode is INSTALL

Configuration register is 0x102

Thu Oct 19 2023 13:28:48 GMT+0800 (China Standard Time)

===================================================================================

#show romvar

ROMMON variables:

PS1 = rommon ! >

 LICENSE_BOOT_LEVEL =

 RET_2_RTS =

 THRPUT =

 ? = 0

LICENSE_SUITE =

 CHASSIS_HA_LOCAL_IP = 10.64.0.30

CHASSIS_HA_REMOTE_IP = 10.64.0.31

CHASSIS_HA_LOCAL_MASK = 255.255.255.0

SWITCH_PRIORITY = 2

BOOT = bootflash:packages.conf,12;

RET_2_RCALTS =

 SWITCH_NUMBER = 1

BSI = 0

RANDOM_NUM = 481887513

[Leo Laohoo]

What firmware version is the Secondary unit on?  

[Rich R]

And even if they are the same version they also need to be the same install mode - so we need to see "show ver" and "show install summ" from both chassis

[vinar]

See attachment for both WLC configuration. I think we found the culprit.

WLC1 = 9800-L-C 

WLC2 = 9800-L-F

Is there a workaround for this?

[ammahend]

controller must be same form factor, you can not do HA between them, however you can still do primary and backup sort of design.  

[Rich R · Accepted solution]

> Is there a workaround for this?

No! https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/213915-configure-catalyst-9800-wireless-control.html
"Before you enable HA between two 9800 WLCs, perform these validations:

• Both devices must be of same PID."

Your only option for HA with these 2 WLCs is N+1:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/newconfigmodel/b_catalyst-9800-configuration-model/m_n1-highavailability.html
https://www.cisco.com/c/dam/en/us/td/docs/wireless/controller/9800/17-4/deployment-guide/c9800-n-plus-1-high-availability-wp.pdf

[marce1000 · Accepted solution]

 - Ref : https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/217050-convert-installation-mode-between-instal.html
 >...Before High Availability (HA SSO) configuration on the 9800 WLC ensure that both devices have the same installation mode, otherwise you can face a V-Mismatch error: "%BOOT-3-BOOTTIME_INCOMPATIBLE_SW_DETECTED: R0/0: issu_stack: Incompatible software detected."

 M.

[vinar]

Thanks for the helpful response! Appreciate it