SG500 LACP trunk mismatch native vlan on individual ports

[simon.dwyer]

Hi All,

I have just configured up a sg500 with a lacp trunk to an upstream switch.

I am getting native vlan mismatch on the individual ports of the lacp team.

24-Jan-2013 12:54:48 %CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi1/1/24.

24-Jan-2013 12:57:35 %CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi1/1/48.

The following is showing the correct native vlan

BH-WS-AC-2#show int switchport port 1

Port : Po1

Port Mode: Trunk

Gvrp Status: disabled

Ingress Filtering: true

Acceptable Frame Type: admitAll

Ingress UnTagged VLAN ( NATIVE ): 2000

Port is member in:

Vlan               Name               Egress rule Port Membership Type

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

1200               1200                 Tagged           Static       

1210            Management              Tagged           Static       

1212               1212                 Tagged           Static       

2000           Native Vlan             Untagged          Static      

But the following shows that the individual ports think they are the default vlan 1.

BH-WS-AC-2#show int switchport gi1/1/48

Port : gi1/1/48

Port Mode: Trunk

Gvrp Status: disabled

Ingress Filtering: true

Acceptable Frame Type: admitAll

Ingress UnTagged VLAN ( NATIVE ): 1

Port is member in:

Vlan               Name               Egress rule Port Membership Type

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

The following shows the LACP as up:

BH-WS-AC-2#show int Port-Channel 1

Load balancing: src-dst-mac-ip.

Gathering information...

Channel  Ports

-------  -----

Po1      Active: gi1/1/24,gi1/1/48

Is this normal behaviour? as i cannot set the native vlan directly on the gi interface due to it being in the trunk.

Simon

[Tom Watts]

Hi Simon, native vlan mismatch is a cosmetic error from CDP. It won't affect services provided the vlans are a member of the ports in question.

You can set the native vlan while it is within the lag. On the SX500 it would be

config t

int po1

switchport trunk native vlan xxxx

The port channel is the same as any other individual port so it's not a problem. 802.1q specifies the native vlan is the untagged member, if you want to get rid of the error, make sure the untagged vlans match up on both sides.

-Tom
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