Catalyst 9300

[Jimfitzer]

I'm obviously missing something simple here. I have two 9300 (C9300-48U) running 16.6.4 and I cannot create a subinterface on either of them. I have configured them as routed ports and enabled IP routing but get an error when attempting to create a subinterface on any physical interface:

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

Switch#sh int status

Port Name Status Vlan Duplex Speed Type
Gi1/0/1 connected routed a-full a-1000 10/100/1000BaseTX
Gi1/0/2 connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/3 connected routed a-full a-1000 10/100/1000BaseTX
Gi1/0/4 connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/5 connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/6 connected 1 a-full a-1000 10/100/1000BaseTX
Gi1/0/7 notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/8 notconnect routed auto auto 10/100/1000BaseTX
Gi1/0/9 notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/10 notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/11 notconnect 1 auto auto 10/100/1000BaseTX

Switch#sh run int g1/0/1
Building configuration...

Current configuration : 140 bytes
!
interface GigabitEthernet1/0/1
no switchport
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
load-interval 30
end

Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#int g1/0/1.100
^
% Invalid input detected at '^' marker.

Switch(config)

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

show ver:

Switch#
*Jun 18 15:02:20.344 UTC: %SYS-5-CONFIG_I: Configured from console by consolesh ver
Cisco IOS XE Software, Version 16.06.04
Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.6.4, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Sun 08-Jul-18 04:21 by mcpre

Cisco IOS-XE software, Copyright (c) 2005-2018 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: IOS-XE ROMMON
BOOTLDR: System Bootstrap, Version 16.6.1r [FC1], RELEASE SOFTWARE (P)

Switch uptime is 13 hours, 1 minute
Uptime for this control processor is 13 hours, 3 minutes
System returned to ROM by Reload Command
System image file is "flash:packages.conf"
Last reload reason: Reload Command

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
compliance with U.S. and local country laws. By using this product you
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.

Technology Package License Information:

-----------------------------------------------------------------
Technology-package Technology-package
Current Type Next reboot
------------------------------------------------------------------
network-advantage Permanent network-advantage
dna-advantage Subscription dna-advantage

cisco C9300-48U (X86) processor with 1392685K/6147K bytes of memory.
Processor board ID FCW2129G0VA
1 Virtual Ethernet interface
52 Gigabit Ethernet interfaces
8 Ten Gigabit Ethernet interfaces
2 Forty Gigabit Ethernet interfaces
2048K bytes of non-volatile configuration memory.
8388608K bytes of physical memory.
1638400K bytes of Crash Files at crashinfo:.
11264000K bytes of Flash at flash:.
0K bytes of WebUI ODM Files at webui:.

Base Ethernet MAC Address : 70:6b:b9:0e:fe:80
Motherboard Assembly Number : 73-17957-07
Motherboard Serial Number : FOC21291WH6
Model Revision Number : A0
Motherboard Revision Number : A0
Model Number : C9300-48U
System Serial Number : FCW2129G0VA

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 62 C9300-48U 16.6.4 CAT9K_IOSXE INSTALL

Configuration register is 0x102

Switch#

[balaji.bandi]

I am not sure aware of nay bugs : hope this standalone switch, not stack wise(guess not)

Switch(config)#int g1/0/1.100

Try full name

config t

!

interface GigabitEthernet1/0/1.100

for reference :

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-12/configuration_guide/vlan/b_1612_vlan_9300_cg/configuring_layer_3_subinterfaces.html

try below guide : 16.6 (attached)

[Jimfitzer]

Both of the switches are standalone. I also tried the full interface name with no success. I have gone through the same documentation you listed and didn't find anything - it does note the VLAN subinterfaces are not supported but I am just trying to create a subinterface on the physical interface. I have also tried multiple interfaces. These switches are running the same licenses as others that are working for this config. Only difference is model # and code version. C9300-48P it works and C9300-48U it does not. I would think that subinterfaces would be supported in ver 16.6.4. Still looking for an answer...

[balaji.bandi]

check attached guide ( different never seen this)

Most of my deployment 16.12.x UXM and above- so all works, not sure this model, feature also not show - bizzard

https://cfnng.cisco.com/archived-data

[Leo Laohoo]

I got some bad news and some more bad news.  

Bad News:  Layer 3 Sub-Interfaces was first introduced on 16.12.X and the switch is running 16.6.X.  Refer to LAN Configuration Guide, Cisco IOS XE Gibraltar 16.12.x (Catalyst 9300 Switches) and scroll down to the Feature Information for Layer 3 Subinterfaces section (Table 1).

Some more Bad News:  16.12.X is not a very stable train.  Actually, it is one of the worst.  

Upgrade to 17.3.3 and try again.  

[Mohsin Alam]

Upgrade your device and you can use the guide:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/17-3/configuration_guide/vlan/b_173_vlan_9300_cg/configuring_layer_3_subinterfaces.html

## Make sure to mark post as helpful, If it resolved your issue. ##

[Jimfitzer]

Yes, confirmed by TAC that subinterfaces not supported in version 16.6.x. Thanks Leo.