From: Muhabat Khan (muhabat@gmail.com)
Date: Mon Dec 29 2008 - 08:24:53 ARST
n switches, VTP MD5 Hash (or MD5 digest) is derived from password. for
successful interswitch vtp information synchronization. These two values
should match else both swiches (server/client mode) will not sync with each
other as each packet has this hash value and only other switch will accept
information if hash value of receiving packet matches with its own hash
value.
Theoretically these Hash values should be changed only changing after
password but in this case hash value is being derived from password+domain
name.... quite strange.
two hash values are.........
MD5 digest : 0x13 0x95 0x3A 0xE0 0xED 0x65 0x5E 0x18
MD5 digest : 0xC1 0x76 0xED 0x05 0x05 0x70 0x10 0xC1
On Mon, Dec 29, 2008 at 12:47 PM, Carlos G Mendioroz <tron@huapi.ba.ar>wrote:
> What is a hash ?
>
> Muhabat Khan @ 29/12/2008 6:49 -0200 dixit:
> > Hi GS,
> > when i change a vtp domain name then hash value on switch also
> changes....
> > is this normal behavior? BTW i am using dynamips NM-16ESW switch.
> >
> > Please see below output.
> >
> > Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
> > sw2(config)#do sh vtp status
> > VTP Version : 2
> > Configuration Revision : 0
> > Maximum VLANs supported locally : 36
> > Number of existing VLANs : 5
> > VTP Operating Mode : Client
> > VTP Domain Name : null
> > VTP Pruning Mode : Disabled
> > VTP V2 Mode : Disabled
> > VTP Traps Generation : Disabled
> > MD5 digest : 0x13 0x95 0x3A 0xE0 0xED 0x65 0x5E 0x18
> > Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
> > sw2(config)#vtp
> > sw2(config)#vtp do
> > sw2(config)#vtp domain CCIE
> > Changing VTP domain name from null to CCIE
> > sw2(config)#do sh vtp status
> > VTP Version : 2
> > Configuration Revision : 0
> > Maximum VLANs supported locally : 36
> > Number of existing VLANs : 5
> > VTP Operating Mode : Client
> > VTP Domain Name : CCIE
> > VTP Pruning Mode : Disabled
> > VTP V2 Mode : Disabled
> > VTP Traps Generation : Disabled
> > MD5 digest : 0xC1 0x76 0xED 0x05 0x05 0x70 0x10 0xC1
> > Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
> >
> >
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> --
> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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