Symptom

When running 17.10.1 version, the chassis C9606R with only one c9600x-sup2 present, doesn't allow to make changes of power budget mode dual-sup to single-sup. Giving following error message: % cannot enable single sup mode when remote supervisor is present According to the documentation, it's supported to make changes from the default (dual-sup) mode to single-sup mode if there is only one sup present on the chassis. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/17-10/configuration_guide/sys_mgmt/b_1710_sys_mgmt_9600_cg/environmental_monitoring_and_power_management.html#id_81805:~:text=Dual%20Supervisor%20Setup-,Configuring%20the%20Power%20Budget%20Mode%20for%20a%20Single%20Supervisor,-Beginning%20in%20the

Conditions

- C9606R chassis with only one C9600X-SUP2 present - Running IOSXE 17.10.1 version - No SVL configuration present TROMBONE#show module Chassis Type: C9606R Switch Number 1 Mod Ports Card Type Model Serial No. ---+-----+--------------------------------------+--------------+-------------- 2 0 Blank Module C9600-SLOT-BLANK N/A 3 0 Supervisor 2 Module C9600X-SUP-2 FDO25320HY0 4 0 Blank Module C9600-SLOT-BLANK N/A 5 0 Blank Module C9600-SLOT-BLANK N/A 6 0 Blank Module C9600-SLOT-BLANK N/A Mod MAC addresses Hw Fw Sw Status ---+--------------------------------+----+------------+------------------+-------- 3 A478.06EC.4C00 to A478.06EC.4C7F 2.0 17.10.1r 17.10.01 ok

Workaround

- Applied and reproduced the issue on CALO - Possible workaround found by adding SVL configuration by following which allow the system to apply command "power budget switch 1 mode single-sup". Verified the single-sup mode change by reload and power cycle. [+] Added SVL domain by: TROMBONE(config)#stackwise-virtual Please reload the switch for Stackwise Virtual configuration to take effect Upon reboot, the config will be part of running config but not part of start up config. TROMBONE(config-stackwise-virtual)# TROMBONE(config-stackwise-virtual)#domain 1 TROMBONE(config-stackwise-virtual)# TROMBONE(config-stackwise-virtual)#end TROMBONE# [+] Managed to configure power budget mode single-sup TROMBONE(config)#power budget switch 1 mode single-sup % power budget disabled for Chassis 1 standby SUP TROMBONE(config)# TROMBONE(config)#end [+] Verified the power budget mode with reload and power cycle TROMBONE#show power detail Switch:1 Power Fan States Supply Model No Type Capacity Status 1 2 ------ -------------------- ---- -------- --------- ----------- PS1 C9600-PWR-2KWAC ac 2000 W active good good PS2 C9600-PWR-2KWAC ac 2000 W active good good PS Current Configuration Mode : Combined PS Current Operating State : Normal Power supplies currently active : 2 Power supplies currently available : 2 Power Summary Maximum (in Watts) Used Available ------------- ------ --------- System Power 1110 3940 ------------- ------ --------- Total 1110 3940 Switch:1 Power Budget Mode : Single Sup Power Out of In Mod Model No State Budget Instantaneous Peak Reset Reset --- -------------------- -------- ------ ------------- ---- ------ ----- 3 C9600X-SUP-2 accepted 660 0 0 660 0 4 C9600X-SUP-2 accepted 0 0 0 660 0 FM1 C9606-FAN accepted 450 100 100 450 -- --- -------------------- -------- ------ ------------- ---- ------ ----- Total allocated power: 1110 Total required power: 1770 TROMBONE#

Further Problem Description