From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sat Aug 18 2007 - 21:02:42 ART
Hi,
I remember I was seeing the following error messages when I tested a similar
scenario as yours last time:
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on
FastEthernet0/1 (2), with Switch2 FastEthernet0/1 (3).
%SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 3 on
FastEthernet0/1 VLAN2.
%SPANTREE-2-BLOCK_PVID_PEER: Blocking FastEthernet0/1 on VLAN0003.
Inconsistent peer vlan.
%SPANTREE-2-BLOCK_PVID_LOCAL: Blocking FastEthernet0/1 on VLAN0002.
Inconsistent local vlan.
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed
state to up
You probably won't see the messages since you have disabled CDP and STP.
Even in normal trunk setup where both ends have the same native VLAN ID (not
default VLAN 1), VTP will still prune the native VLAN if the neighboring
switch does not have an active port in this VLAN. You can try the workaround
command "switchport trunk pruning vlan remove <your_native_vlanID>".
Correct me if I'm wrong. Let's hear it from the group.
Thank you.
B.Rgds,
Lim TS
On 8/19/07, NITIN NITIN <ccie_study_123@yahoo.com> wrote:
>
> Hi experts ,
>
> A basic queery
>
> Please help me coz had put earlier also but no reply ----
>
>
> If there are two switces A and B
>
>
> R1----(vlan 2)-SWITCH-A fa1/1=======TRUNK==========fa2/2 SWITCH-B-vlan
> 200--R2
>
> 1)SWITCH-A has vlan 2
>
> 2) SWITCH-B has vlan 200
>
> 3) SWITCH-A and SWITCH-B in VTP DOMAIN TEST
>
> If I want them to speak to each other
>
> 4) on SWITCH-A configured
> A fa1/1
> swictport trunk native vlan 2
>
> on SWITCH-A configured
> B fa2/2
> swictport trunk native vlan 200
>
>
> 5) disabled CDP on TRUNK AND SPANNING TREE FOR THESE VLANS
>
> NOW Q IS --------------------
>
> 6) VTP PRUNNING enabled ---
>
> SWITCH-B has VLAN 200 active and applied to an access interface
> so it tells SWITCH-A not prune it
>
> and
>
> SWITCH-A has VLAN 2 active and applied to an access interface
> so it tells SWITCH-B not prune it
>
> ACTUALL ISSUE --------------------
>
> 7) But SWITCH-B has no vlan 2 so will switch SWITCH-A prune on trunk its
> own vlan
> (VLAN 2) on trunk and similarly SWITCH-A has no vlan 200 so will switch
> SWITCH-B prune on trunk its own vlan (VLAN 200 ) on trunk
>
> and connectivity BROKEN due to this ??????????
>
>
> Please help
>
> :) Thanks in advance
>
>
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