Re: VTP transparent mode md5 gets changed

Karthik,
there are some discussions pointing that a transparent switch in v2 (or
v1) is only transparent when the domains match, or when the transparent
switch has a null domain. Your remark on the MD5 hash is an interesting
one. May be the transparent switch is just dropping the messages (bug ?)

Try clearing the domain to see if that helps...
-Carlos

karthik thatikonda @ 15/03/2012 14:51 -0300 dixit:
> To explain clearly.
>
> trunks are configured between sw1 to sw2, sw3 and sw4.
>
> sw1 is in transparent mode
>
> sw2 is in server mode
>
> sw3 and sw4 are in client mode
>
>
> Once I changed sw1 to transparent md5 on sw1 doesn't match to that on sw2.
> Also, since sw2 is server mode, when I created a vlan it supposed to
> propagate to other switches in client mode that is sw3 and sw4. But, I
> don't see that happening when sw1 is in transparent mode.
>
>
>
> SW1#sh vtp status
> VTP Version : 2
> Configuration Revision : 0
> Maximum VLANs supported locally : 1005
> Number of existing VLANs : 11
> VTP Operating Mode : Transparent
> VTP Domain Name : CCIE
> VTP Pruning Mode : Disabled
> VTP V2 Mode : Enabled
> VTP Traps Generation : Disabled
> MD5 digest : 0xC4 0x17 0x67 0xE6 0xB0 0x6D 0xF0 0x38
> Configuration last modified by 155.30.37.7 at 3-2-93 18:09:58
> SW1#
> SW1#sh vlan id 126
> VLAN id 126 not found in current VLAN database
> SW1#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> SW1(config)#vtp vers
> SW1(config)#vtp version 2
> VTP mode already in V2.
> SW1(config)#
>
> ===
>
> SW2(config)#vl 126
> SW2(config-vlan)#
> SW2#
> SW2#
> SW2#
> SW2#
> SW2#
> 1d18h: %SYS-5-CONFIG_I: Configured from console by console
> SW2#sh vl id 126
>
> VLAN Name Status Ports
> ---- -------------------------------- ---------
> -------------------------------
> 126 VLAN0126 active Fa0/13, Fa0/14, Fa0/15
>
> VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1
> Trans2
> ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------
> ------
> 126 enet 100126 1500 - - - - - 0 0
>
> Remote SPAN VLAN
> ----------------
> Disabled
>
> Primary Secondary Type Ports
> ------- --------- -----------------
> ------------------------------------------
>
> SW2#
> SW2#sh vtp status
> VTP Version : 2
> Configuration Revision : 6
> Maximum VLANs supported locally : 1005
> Number of existing VLANs : 19
> VTP Operating Mode : Server
> VTP Domain Name : CCIE
> VTP Pruning Mode : Disabled
> VTP V2 Mode : Enabled
> VTP Traps Generation : Disabled
> MD5 digest : 0xA0 0x68 0x07 0x2C 0xB9 0xF2 0xFA 0x6B
> Configuration last modified by 155.30.8.8 at 3-2-93 18:12:06
> Local updater ID is 155.30.8.8 on interface Vl8 (lowest numbered VLAN
> interface found)
> SW2#
> SW2#
> SW2#
>
>
> ====
>
> SW4# sh vl | i ^126
> SW4#sh vl id 126
> VLAN id 126 not found in current VLAN database
> SW4#sh vtp status
> VTP Version : 2
> Configuration Revision : 5
> Maximum VLANs supported locally : 1005
> Number of existing VLANs : 18
> VTP Operating Mode : Client
> VTP Domain Name : CCIE
> VTP Pruning Mode : Disabled
> VTP V2 Mode : Enabled
> VTP Traps Generation : Disabled
> MD5 digest : 0xF5 0xDB 0xB5 0xDC 0x36 0xF8 0xF3 0x30
> Configuration last modified by 155.30.8.8 at 3-2-93 18:09:58
>
>
> Thanks,
>
>
> Karthik.
>
>
> On Wed, Mar 14, 2012 at 10:31 PM, karthik thatikonda
> <get2explore_at_gmail.com>wrote:
>
>> Hi,
>>
>> When configuring sw2 as transparent mode, seeing that md5 is not matched
>> on the switches and any creation of vlan on sw1 i.e. server is not
>> propagation vtp updates to sw3 and sw4. If I change sw2 to client, md5
>> shows correct on all switches and sw3 and sw4 learn vlan created on sw2
>> (server). Am I missing anything?. Please, let me know.
>>
>> SW2#sh vtp status
>> VTP Version : 2
>> Configuration Revision : 4
>> Maximum VLANs supported locally : 1005
>> Number of existing VLANs : 18
>> VTP Operating Mode : Server>>>>>>>>>>>>>>>>>>>>>>>
>> VTP Domain Name : CCIE
>> VTP Pruning Mode : Disabled
>> VTP V2 Mode : Disabled
>> VTP Traps Generation : Disabled
>> MD5 digest : 0x3C 0xAF 0xD7 0xFB 0xB5 0x11 0xB4 0x4B
>>>>>>>>>>>>>>>>>>>>
>> Configuration last modified by 155.30.8.8 at 3-2-93 05:38:01
>> Local updater ID is 155.30.8.8 on interface Vl8 (lowest numbered VLAN
>> interface found)
>> SW2#
>> SW2#
>>
>>
>>
>> SW1#sh vtp status
>> VTP Version : 2
>> Configuration Revision : 0
>> Maximum VLANs supported locally : 1005
>> Number of existing VLANs : 11
>> VTP Operating Mode : Transparent>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>> VTP Domain Name : CCIE
>> VTP Pruning Mode : Disabled
>> VTP V2 Mode : Disabled
>> VTP Traps Generation : Disabled
>> MD5 digest : 0x9B 0x27 0x73 0x7F 0xB4 0xB1 0xD3 0x29
>> ==========>>>>>>>
>> Configuration last modified by 155.30.37.7 at 3-2-93 03:10:45
>> SW1#conf t
>> Enter configuration commands, one per line. End with CNTL/Z.
>> SW1(config)#vtp mod clie
>> Setting device to VTP CLIENT mode.
>> SW1(config)#
>>
>> +++++
>>
>> AFter changing to client. md5 matches
>>
>> +++++
>>
>>
>> SW1#sh vtp status
>> VTP Version : 2
>> Configuration Revision : 4
>> Maximum VLANs supported locally : 1005
>> Number of existing VLANs : 18
>> VTP Operating Mode : Client
>> VTP Domain Name : CCIE
>> VTP Pruning Mode : Disabled
>> VTP V2 Mode : Disabled
>> VTP Traps Generation : Disabled
>> MD5 digest : 0x3C 0xAF 0xD7 0xFB 0xB5 0x11 0xB4 0x4B
>> Configuration last modified by 155.30.8.8 at 3-2-93 05:38:01
>> Thanks,
>>
>> Karthik.
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net