Inconsistent Peer VLAN Error

[ivanka_busta]

Hello,

I have a switch cisco WS-CBS3012-IBM-I attached to a Cisco 6500 through an etherchannel connection.

This is the configuration in the etherchannel ports of the cisco WS-CBS3012-IBM-I:

interface GigabitEthernet0/15
description FEC_4_Con_H-4635
switchport trunk native vlan 20
switchport trunk allowed vlan 1,20,68,69,80-85,90,91,101,102,150,151,199
switchport mode trunk
channel-group 4 mode on
end

interface GigabitEthernet0/16
description FEC_4_Con_H-4635
switchport trunk native vlan 20
switchport trunk allowed vlan 1,20,68,69,80-85,90,91,101,102,150,151,199
switchport mode trunk
channel-group 4 mode on
end

interface Port-channel4
description FEC_4_Con_H-4635
switchport trunk native vlan 20
switchport trunk allowed vlan 1,20,68,69,80-85,90,91,101,102,150,151,199
switchport mode trunk
link state group 1 upstream
spanning-tree vlan 1,20,68-69,80-85,90,199,222 port-priority 16
end

Configuration in the Cisco 6500 ports :

interface GigabitEthernet2/45
description Conexion_Blade_Dcha_S3
switchport
switchport trunk encapsulation dot1q
switchport trunk native vlan 20
switchport trunk allowed vlan 1,20,68,69,80-85,90,91,101,102,150,151,199
switchport mode trunk
rmon collection stats 6031 owner monitor
channel-group 4 mode on
end

interface GigabitEthernet2/46
description Conexion_Blade_Dcha_S3
switchport
switchport trunk encapsulation dot1q
switchport trunk native vlan 20
switchport trunk allowed vlan 1,20,68,69,80-85,90,91,101,102,150,151,199
switchport mode trunk
rmon collection stats 6032 owner monitor
channel-group 4 mode on
end

interface Port-channel4
description Conexion_Blade_Switch_D1
switchport
switchport trunk encapsulation dot1q
switchport trunk native vlan 20
switchport trunk allowed vlan 1,20,68,69,80-85,90,91,101,102,150,151,199
switchport mode trunk
spanning-tree vlan 1,20,68-69,80,82,84-85,90,199,222 port-priority 16
end

I'm getting these error messages in the log of the Cisco 6500:

Feb 5 08:40:55 CET: %SPANTREE-SP-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 1 on Port-channel4 VLAN20.
Feb 5 08:40:55 CET: %SPANTREE-SP-2-BLOCK_PVID_PEER: Blocking Port-channel4 on VLAN0001. Inconsistent peer vlan.
Feb 5 08:40:55 CET: %SPANTREE-SP-2-BLOCK_PVID_LOCAL: Blocking Port-channel4 on VLAN0020. Inconsistent local vlan.
Feb 5 08:41:41 CET: %PM-SP-4-ERR_DISABLE: channel-misconfig error detected on Po4, putting Gi2/45 in err-disable state
Feb 5 08:41:41 CET: %PM-SP-4-ERR_DISABLE: channel-misconfig error detected on Po4, putting Gi2/46 in err-disable state
Feb 5 08:41:41 CET: %PM-SP-4-ERR_DISABLE: channel-misconfig error detected on Po4, putting Po4 in err-disable state

Cisco WS-CBS3012-IBM-I  --> IOS 15.0(2)SE5 

Cisco 6500--> IOS 12.2(17r)SX5

This problem started after replacing the Cisco WS-CBS3012-IBM-I. The one which was replaced had IOS 12.2(40)EX2 .

Could this problem be related with the IOS in Cisco WS-CBS3012-IBM-I? Is something wrong in the configuration? Is it possible to downgrade from IOS 15.0(2)SE5 to IOS 12.2(40)EX2?

Thanks in advance.

[Mark Malone]

Out of interest if you remove the native trunk command do you still get the alerts , maybe it has an issue with the native being changed , could well be an ios issue , you should be able to downgrade its same dram etc on both versions

you could try use bpdufilter as well but that's a forceful fix really domnt see any particular problem with the config, I have these blade types(hp/dell) no issues with them but we have not changed the native syntax and usually you see that log when there's a native issue on 1 side of trunk

[ivanka_busta]

Thanks for your ideas. I haven't tried any of them yet because the switch is in the production network and I have to wait. However, there is something about the configuration which is making me feel confused. Even though, native vlan 20 is configured in the Cisco WS-CBS3012-IBM-I ports there is no vlan 20 configured. Only interface vlan 20 is configured on the switch. Is that right?

On Cisco 6500 there are both vlan 20 and interface vlan 20 configured.

I enclose show vlan and interface vlan of the Cisco WS-CBS3012-IBM-I.

Thanks.

[Mark Malone]

Hey

Yes the vlan should also be created in the L2 database especially if its being passed down the trunk on both sides 6500 and blade switch , if its missing at layer 2 DB its not going to process it correctly as it does not know about it , the interface vlan 20 is created is fine that's the layer 3 bit but telling the blade that's its native vlan is 20 but it is not in the DB is going to cause you issues