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New Member

VTP is not working through a wireless link

Hi,

I have a 3524 switch that is connected to corporate network and an acess point (AIR-BR1410A) this AP is connected to another AP (the same model) by wireless and the second AP is connected to a 2950 switch. both switches are VTP lient. the first switch gets all VLAN information by VTP but the second one dose not. the ports those connected to AP's is in trunk mode, 802.1Q. VTP domain and password are same in all switches.

Thank you

Siamak

8 REPLIES
Silver

Re: VTP is not working through a wireless link

Hi,

Could u specify the version of IOS in Aironet Root Bridge APs???? What is the natvie vlan being used??? VLAN 1 or something other..... There was IOS caveats were there and the same seems to be resoved in 12.3(2)JA version.

CSCeg12593?Bridges now pass VTP information when the native VLAN on the bridge is not VLAN 1.

Rate if it does,

Rgs

Rgs,

New Member

Re: VTP is not working through a wireless link

Hi,

12.3(7)JA3

Cheers,

New Member

Re: VTP is not working through a wireless link

Hi,

The native vlan is 1. Should I change it to something else?

Regards,

Siamak

Cisco Employee

Re: VTP is not working through a wireless link

Siamak,

No, you should be fine with the native vlan. Could you please post the trunk config from the both the switches. Also " Show VTP Status " and " Show VTP counters".

-amit singh

New Member

Re: VTP is not working through a wireless link

Hi,

[corporate LAN]------[SW1 - f0/3]--[AP1] - - - - - [AP2]--[f0/12 - SW2]

SW1#sh inter fa 0/3 status

Port Name Status Vlan Duplex Speed Type

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

Fa0/3 connected trunk A-Full A-100 100BaseTX/FX

SW1#sh vtp status

VTP Version : 2

Configuration Revision : 30

Maximum VLANs supported locally : 254

Number of existing VLANs : 22

VTP Operating Mode : Client

VTP Domain Name : SMM_DO

VTP Pruning Mode : Disabled

VTP V2 Mode : Disabled

VTP Traps Generation : Disabled

MD5 digest : 0x18 0x25 0x64 0xF6 0xD8 0xB0 0x00 0xFD

Configuration last modified by 127.0.0.52 at 7-27-07 04:39:37

SW1#sh vtp counters

VTP statistics:

Summary advertisements received : 9035

Subset advertisements received : 23

Request advertisements received : 41

Summary advertisements transmitted : 26217

Subset advertisements transmitted : 81

Request advertisements transmitted : 40

Number of config revision errors : 0

Number of config digest errors : 0

Number of V1 summary errors : 0

VTP pruning statistics:

Trunk Join Transmitted Join Received Summary advts received from

non-pruning-capable device

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

Fa0/1 0 0 0

Fa0/2 0 0 0

Fa0/3 0 0 0

Gi0/1 0 0 0

SW1#sh int fas 0/3 acc

FastEthernet0/3

Protocol Pkts In Chars In Pkts Out Chars Out

Spanning Tree 40 1485 3948322 247402392

CDP 43464 15212385 43467 16778238

VTP 4652 426126 5140 536390

Thanks

New Member

Re: VTP is not working through a wireless link

************ SW2 (dosn't have VLAN info) *************

SW2#sh int trunk

Port Mode Encapsulation Status Native vlan

Fa0/11 on 802.1q trunking 1

Fa0/12 on 802.1q trunking 1

Port Vlans allowed on trunk

Fa0/11 1,200

Fa0/12 1,200

Port Vlans allowed and active in management domain

Fa0/11 1

Fa0/12 1

Port Vlans in spanning tree forwarding state and not pruned

Fa0/11 1

Fa0/12 1

SW2#sh vtp status

VTP Version : 2

Configuration Revision : 0

Maximum VLANs supported locally : 128

Number of existing VLANs : 5

VTP Operating Mode : Client

VTP Domain Name : SMM_DO

VTP Pruning Mode : Disabled

VTP V2 Mode : Disabled

VTP Traps Generation : Disabled

MD5 digest : 0xEC 0x64 0xE3 0xE7 0xF9 0x78 0xD3 0x0F

Configuration last modified by 106.149.14.55 at 7-27-07 02:50:30

SW2#sh vtp c

VTP statistics:

Summary advertisements received : 0

Subset advertisements received : 0

Request advertisements received : 0

Summary advertisements transmitted : 1771

Subset advertisements transmitted : 42

Request advertisements transmitted : 100

Number of config revision errors : 0

Number of config digest errors : 0

Number of V1 summary errors : 0

VTP pruning statistics:

Trunk Join Transmitted Join Received Summary advts received from

non-pruning-capable device

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

Fa0/11 0 0 0

Fa0/12 0 0 0

SW2#sh int fas 0/12 acc

FastEthernet0/12

Protocol Pkts In Chars In Pkts Out Chars Out

Spanning Tree 333120 19319916 1 60

CDP 5523 1933050 5525 2259669

VTP 0 0 960 96016

Thanks

Cisco Employee

Re: VTP is not working through a wireless link

Siamak,

You trunk config and the VTP config looks fine and there is no issues with that.

I did som research on this and came across a bug with is integrated in 12.3.7 series of IOS.

Bug ID is : CSCsc88624

Non-root bridge modifies VTP packets from SNAP format to DIX format. It causes VTP

clients not to update the VLAN database if the wireless bridge is the only link between VTP

server and the VTP clients.

The Fixed for this Bug is in 12.3(8)JA2.

I would suggest you to upgrade the AP's to atleast 12.3(8)JA2 and check if it solves the issue.

HTH,Please rate if it does.

-amit singh

New Member

Re: VTP is not working through a wireless link

Thank you very much Amit.

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