SVI - VTP no sync

[Maurizio Caloro]

Configuring c1921 with a couple SVI interfaces, yes the Switch neighbor will
recieve the IP defined from the scope that i give, and ping alive both side.

VTP v2 Server setup c1921, and Switch running Client mode but
no VTP synchronisation will be succeed.

vtp domain transit
vtp version 2
vtp password lalala
vtp mode server

Debugung:
*Feb 13 17:45:04.894: VTP LOG RUNTIME: Transmit vtp request, domain transit, start value 0

Router#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 20
Number of existing VLANs : 15
VTP Operating Mode : Server
VTP Domain Name : transit
VTP Pruning Mode : Disabled
VTP V2 Mode : Enabled
VTP Traps Generation : Disabled
MD5 digest : 0xE7 0x44 0x94 0x7B 0x6D 0x2A 0xAB 0x5C
Configuration last modified by 10.10.10.1 at 2-13-24 16:06:06
Local updater ID is 10.10.10.1 on interface Gi0/0.10 (first interface found)

--

besnvsw01#sh vtp status
VTP Version capable : 1 to 3
VTP version running : 2
VTP Domain Name : transit
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 00b7.7172.c080
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Feature VLAN:
--------------
VTP Operating Mode : Client
Maximum VLANs supported locally : 1005
Number of existing VLANs : 7
Configuration Revision : 0
MD5 digest : 0x81 0x1A 0x4A 0x2E 0xCC 0x45 0x31 0xE9
0x11 0x3A 0x6V 0x2C 0x52 0x11 0x19 0xAE

besnvsw01#sh cdp neighbors
Capability Codes: R - Router, B - Source Route Bridge, S - Switch

Device ID Local Intrfce Holdtme Capability Platform Port ID
Router.pluto Gig 1/0/48 155 R B S CISCO1921 Gig 0/0

After Setup, i also add new VLAN, but no sync.
thanks

[MHM Cisco World]

I dont know if router support VTP

But anyway maybe it can if it have swithc module.

Did you config trunk between SW and R' vtp need trunk.

MHM

[Joseph W. Doherty]

You're using a trunk between devices?

[Maurizio Caloro · Accepted solution]

yes this Switch and Router has a trunk connection between
and are connected together.

Switch
!
int gi1/0/48
Desc ** Trunk to c1921 **
switchport trunk allowed vlan 10,20,30,40,800
switchport mode trunk
end
!

Port
!
int range gi1/0/1 - 10
description client and voice
switchport access vlan 20
switchport mode access
switchport voice access vlan 10
cdp enable
spanning-tree portfast
!

Router
yes the Router has a additional 4 Port "ehwic-4esg" module installed.
possible this VTP feature are only available for this additonal integrated
4 Port Switch module in this router.

!
int Gi0/1.10
description ** voice **
encapsulation dot1Q 10
ip address a.b.10.1 255.255.255.128
!
int Gi0/1.20
description ** computers **
encapsulation dot1Q 20
ip address a.b.20.1 255.255.255.128
!
int Gi0/1.30
description ** printers **
encapsulation dot1Q 30
ip address a.b.30.1 255.255.255.128
!
int Gi0/1.40
description ** others **
encapsulation dot1Q 40
ip address a.b.40.1 255.255.255.128
!
int Gi0/1.800
description ** management **
encapsulation dot1Q 800
ip address a.b.50.1 255.255.255.128

thanks

[Giuseppe Larosa]

Hello @Maurizio Caloro ,

you are using a built in routed port gi0/1  with subinterfaces . VTP may run only on ports of the etherswitch module as it is a L2 protocol that routers do not support on standard ports.

You should connect a L2 trunk port from etherswitch module to the switch on another trunk port  just to propagate Vlans database.

The best move would be to make the switch a VTP server or transparent and to create Vlans on it.

Hope to help

Giuseppe

[Joseph W. Doherty]

As @Giuseppe Larosa also noted a routed port with sub interfaces isn't quite the same as a switch's trunk port, it's L3 vs. L2.

[MHM Cisco World]

Indeed this trunk between router and sw'

But why router need vlan and hence run vtp.

You use subinterface (use only tag) not vlan svi that need vlan add to db. 

So I think what you see normal.

MHM