Two switches in server mode do not advertise their vlan info. with each other
Hello All,
I have some queries regarding the VTP advertisement as below.
Scenario.....
I have taken two switches named as switch-A and Switch-B connected with each other with port f0/1.I have defined f0/1 as trunk on both the switches.
Then i created the Vlan 2,3,4 on switch-A ,Switch-A configurations revision number got changed from 0 to 3.But when i look up the same on switch-B the revision number is 0 and the vlan that was created on Switch-A is not replicated to Switch-B.
Both Switch-A and Switch-B has default VTP domain configured i.e Null
Both the Switches are in Server mode.
On both the Switches domain password set to null.
Why the vlan is not getting advertise from Switch-A to Switch-B?.According to the vtp configuration they both belong to the same vtp domain i.e null.
So they should advertise the vlan information with each other.
Your suggestion will be appreciated on this.Awaiting for your reply
Thanks,
Mrityunjay singh
Hi Jon,
The trunk is up and running fine.Please find the output for trunk and vtp status as below.
SWITCH-A output---------
SWITCH-A(config)#do sh int f0/1 switch
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
SWITCH-A(config)#do sh vtp status
VTP Version : 2
Configuration Revision : 3
Maximum VLANs supported locally : 255
Number of existing VLANs : 8
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x58 0xD0 0x3C 0x06 0x01 0xE3 0xD7 0x4D
Configuration last modified by 0.0.0.0 at 3-1-93 00:03:02
Local updater ID is 0.0.0.0 (no valid interface found)
SWITCH-B output.......
SWITCH-B(config)#do sh int f0/1 swit
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
SWITCH-B(config)#do sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 5
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x7D 0x5A 0xA6 0x0E 0x9A 0x72 0xA0 0x3A
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 0.0.0.0 (no valid interface found)
I have tried by changing the vtp domain name instead of null and it is working fine in that scenario.But my question is why not is works when the vtp domain is set to null on both the switches.
Your update would be appreciated.
Thanks,
Mrityunjay Singh
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