Spantree problem

[keigo_komatsu]

I have one 7600 connected directly in the switch Force10 model E300 configured in this fashion:

Router 7600

interface GigabitEthernet5/2

description <ommited>

switchport

switchport access vlan 46

switchport mode access

no ip address

load-interval 30

speed nonegotiateend

Switch Force10 - E300

Name: GigabitEthernet 0/9

Description: <ommited>

802.1QTagged: False

Vlan membership:

Vlan 2

The problem is that message is logged in the 7600 router and the interface goes to blocking state.

Jul 5 18:15:06.686 UTC: %SPANTREE-SP-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk GigabitEthernet5/2 VLAN46.

Jul 5 18:15:06.686 UTC: %SPANTREE-SP-7-BLOCK_PORT_TYPE: Blocking GigabitEthernet5/2 on VLAN0046. Inconsistent port type.

[Edison Ortiz]

The portion from the Switch Force10 config indicates the dot1q tagging is disabled. It doesn't indicate if the port is configured for dot1q trunking or not.

As you can see, the 7600 is trying to negotiate the link as access mode but Force10 wants to negotiate as trunk mode.

You either configure trunking on the 7600 or disable it on the Force10. Also, you need to match the native vlans on both.