Cisco C9300: Received 802.1Q BPDU on non trunk

[giangle]

Hi all

I have an issue when configure C9300, my diagram is:

Router ---------  SW C9300 (24) ----------------  (16) SW HP 2510

In HP, port 16 is port access with VLAN 25 and connect to Cisco C9300 in port G1/0/24. When I configure port G1/0/24 in C9300 to port access VLAN 25. The SW 9300 show some follow messages and port G1/0/24 blocked.

Mar 1 00:02:00.861: %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk GigabitEthernet1/0/24 VLAN1. *Mar 1 00:02:00.861: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking GigabitEthernet1/0/24 on VLAN0001. Inconsistent port type.n16

Because two port is port access, so why port G1/0/24 blocked ?. Please help me to fix it.

Thanks & Best Regards,

Giang Le

[Reza Sharifi]

Hi,

On the HP switch, can you make sure the port is configured as untagged (access port) and the default vlan is 1?

HTH

[Jon Marshall]

Are you sure the HP port is not a trunk ? 

Jon

[Andrew Khalil]

@giangle,

Greetings,

Let's first check the Access configuration in both switches,

In case of Cisco Switch:

#int g1/0/24

#switchport mode access

#switchport access vlan 25

#no shutdown

In case of HP Switch:

#vlan 25

#untagged 16

then be sure that this port is not tagged for any vlan, you shouldn't find something like:

#tagged 16

Please don't forget to rate all helpful responses and mark solutions!

Bst Rgds,

Andrew Khalil

[giangle]

Hi Andrew Khalil
Some information for port 16 on HP SW

ProCurve Switch 2510B-24# show vlans ports 16
Status and Counters - VLAN Information - for ports 16

802.1Q VLAN ID Name Status Voice
-------------- ------------ ------------ -----
25 Server_LAN Port-based No

I am sure, this port is port access.

Regards,
Giang Le

[Reza Sharifi]

Hi,

According to the config example in this link, an access port on an HP switch should say "untagged"

https://panenka.sk/cisco-procurve-vlan-ports/

HTH

[giangle]

Hi Reza Sharifi
I configured this port with untagged for vlan 25. But it didn't work

Regards,
Giang

[Andrew Khalil]

@giangle please share us all the configuration of both switches,

otherwise it so difficult to troubleshoot!

Please don't forget to rate all helpful responses and mark solutions!

Bst Rgds,

Andrew Khalil