03-09-2009 10:38 AM - edited 03-06-2019 04:29 AM
Hi all
i have switch config here
sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 6
VTP Operating Mode : Transparent
VTP Domain Name : NMLYB_MID
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Enabled
MD5 digest : 0xA2 0x66 0x3E 0x06 0x0C 0xC0 0x81 0x21
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
As per config it is in Transparent mode.
NExt
sh spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 001d.45d1.e800
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 001d.45d1.e800
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi1/0/1 Desg FWD 4 128.1 P2p
Fa1/0/16 Desg FWD 100 128.18 Shr
VLAN0005
Spanning tree enabled protocol ieee
Root ID Priority 32773
Address 001d.45d1.e800
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32773 (priority 32768 sys-id-ext 5)
Address 001d.45d1.e800
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi1/0/1 Desg FWD 4 128.1 P2p
nmlybs2#
here it shows it is root bridge also.
so my question is can switch in transparent vto mode can be root bridge.
many thanks
Solved! Go to Solution.
03-09-2009 11:28 AM
Mahesh
all other switches will try to reach it
as this is Root bridge for STP.
Well the root bridge is only used for the creation of a loop free topology. So once the topology has been decided on the path the traffic takes does not necessarily have to go through the root bridge.
Vlan updates are sent by VTP servers, altho there is a rare case where a VTP client can actually overwrite the VTP database but this is not normal operation.
Jon
03-09-2009 04:48 PM
Mat
A switch in VTP transparent mode has it's own vlan database. This vlan database is not sent to any other switches and any VTP updates the transparent mode switch receives it does not use to update it's own vlan database but it will forward them on to other switches.
So yes it is responsible for it's own local vlan database.
Jon
03-09-2009 10:39 AM
Mahesh
Well your config kind of proves it can be :-).
Yes, there is no reason why a switch running in VTP transparent mode cannot be the root bridge for some or all of your vlans.
Jon
03-09-2009 11:14 AM
Hi jon,
so in this case mu understaning is that
all other switches will try to reach it
as this is Root bridge for STP.
And VLan updates will be send only by
switch in VTP server mode right?
thanks
03-09-2009 11:28 AM
Mahesh
all other switches will try to reach it
as this is Root bridge for STP.
Well the root bridge is only used for the creation of a loop free topology. So once the topology has been decided on the path the traffic takes does not necessarily have to go through the root bridge.
Vlan updates are sent by VTP servers, altho there is a rare case where a VTP client can actually overwrite the VTP database but this is not normal operation.
Jon
03-09-2009 12:17 PM
Hi jon
Many thanks Again
mahesh
03-09-2009 04:41 PM
Hello Jon,
Hope I can a question?
When a switch is in transparent mode by default it is the server for its own(local) vlans except in this case that the server does not propagate the local vlan database to other switches - correct?
Thanks in advance
Mat
03-09-2009 04:48 PM
Hi Matt
When you set the VTP mode to transparent, then the switches do not participate in VTP.
A VTP transparent switch will not advertise its VLAN configuration and does not synchronize its VLAN configuration from received messages. VLANS can be created, changed or deleted when in transparent mode.
In VTP v 2, transparent switches do forward VTP messages that they receive out their trunk ports.
03-13-2009 08:50 PM
Thanks Adam
03-09-2009 04:48 PM
Mat
A switch in VTP transparent mode has it's own vlan database. This vlan database is not sent to any other switches and any VTP updates the transparent mode switch receives it does not use to update it's own vlan database but it will forward them on to other switches.
So yes it is responsible for it's own local vlan database.
Jon
03-13-2009 11:02 AM
Hi jon
thanks once again for answering the question
03-13-2009 08:50 PM
Thanks Jon
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