%QOS-6-POLICY_INST_FAILED

[tkapela12]

This is total crap. Hitting the same bug as CSCvj25368. What's the issue, Cisco folks? 

...have a really simple, straightforward policy map configured: 

policy-map detangle-queues
class v4-lsb-0
set dscp default
class v4-lsb-1
set dscp 1
class v4-lsb-2
set dscp 2
class v4-lsb-3
set dscp 3
class v4-lsb-4
set dscp 4
class v4-lsb-5
set dscp 5
class v4-lsb-6
set dscp 6
class v4-lsb-7
set dscp 7

...each class merely matches a standard IP ACL:

ip access-list standard v4-lsb-0
permit 0.0.0.0 255.255.255.248
ip access-list standard v4-lsb-1
permit 0.0.0.1 255.255.255.248
ip access-list standard v4-lsb-2
permit 0.0.0.2 255.255.255.248
ip access-list standard v4-lsb-3
permit 0.0.0.3 255.255.255.248
ip access-list standard v4-lsb-4
permit 0.0.0.4 255.255.255.248
ip access-list standard v4-lsb-5
permit 0.0.0.5 255.255.255.248
ip access-list standard v4-lsb-6
permit 0.0.0.6 255.255.255.248
ip access-list standard v4-lsb-7
permit 0.0.0.7 255.255.255.248

class-map match-all v4-lsb-7
match access-group name v4-lsb-7
class-map match-all v4-lsb-6
match access-group name v4-lsb-6
class-map match-all v4-lsb-5
match access-group name v4-lsb-5
class-map match-all v4-lsb-4
match access-group name v4-lsb-4
class-map match-all v4-lsb-3
match access-group name v4-lsb-3
class-map match-all v4-lsb-2
match access-group name v4-lsb-2
class-map match-all v4-lsb-1
match access-group name v4-lsb-1
class-map match-all v4-lsb-0
match access-group name v4-lsb-0

...and boom, can't apply it to more than four interfaces: 

switch(config-if-range)#service-policy input detangle-queues
HAY_HQM_IF_POLICY_ADD_CMD send failed for interface GigabitEthernet0/27

Service Policy attachment failed
% Interface range command failed for GigabitEthernet0/27
switch(config)#
Aug 24 16:28:42.876: HQM: Failed command 18 0 2
Aug 24 16:28:42.877: %QOS-6-POLICY_INST_FAILED:
Service policy installation failed

Seriously. WTF. This appears in no docs, caveats, etc. 

Additionally, tcam nowhere close to full:

switch#sh platform tcam utilization asic all
TCAM USAGE OF ASIC NUM 0
MAC/IPV4 ACEs : 11
IPV6 ACEs : 0
L2 TCAM TABLE USAGE : 28
MULTICAST GROUP USAGE : 9

[balaji.bandi]

Can you post what device model and what IOS code running on the switch:

show version help us to understand the issue.

there may be limitations - check this also : (if the switch 2960X)

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960l/software/15-2_6_e/configuration_guide/b_1526e_consolidated_2960l_cg/b_1526e_consolidated_2960l_cg_chapter_010111.html

[tkapela12]

(checking the 2960L caveat docs)… which I had already reviewed, but now noticing this convenient number:

“32 class maps per ASIC” — I see now that this means “a sum-totall of 32 class map statements, across all applied policy maps” — and NOT merely 32 total configured classes *referenced* by any number of ports.

This caveat and limitation description language leaves much to be desired.

So, with eight classes in the policy map, I can see now only that four ports can be configured to use it.

…not that it matters, but platform details:

Cisco IOS Software, C2960L Software (C2960L-UNIVERSALK9-M), Version 15.2(7)E5, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2021 by Cisco Systems, Inc.
Compiled Mon 13-Sep-21 09:26 by mcpre

ROM: Bootstrap program is C2960L boot loader
BOOTLDR: C2960L Boot Loader (C2960L-HBOOT-M) Version 15.2(5r)E3, RELEASE SOFTWARE (fc2)

switch uptime is 1 week, 5 days, 19 hours, 26 minutes
System returned to ROM by power-on
System restarted at 23:13:09 UTC Thu Aug 11 2022
System image file is "flash:c2960l-universalk9-mz.152-7.E5/c2960l-universalk9-mz.152-7.E5.bin"
Last reload reason: power-on



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cisco WS-C2960L-24TS-LL (Marvell PJ4B (584) v7 (Rev 2)) processor (revision D0) with 524288K bytes of memory.
Processor board ID FCW2112A2M7
Last reset from Reload
1 Virtual Ethernet interface
28 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:F8:2C:76:C5:80
Motherboard assembly number : U58O342T02
Power supply part number : 341-100559-01
Motherboard serial number : FOC21102SXU