Solved: All the client switches becoming STP ROOT switches

chandra_rc16 · ‎01-11-2014

Hi All,

Here is my topology. I've two vlans (50,60). I was doing some lab so just build this topology and when i check the the spaning tree configuration on all the switches except the two transparent switches. All the client switches have become ROOT switches for VLAN50,60.

I've give the below commands on the VTP-Server, but still the problem is not clearing.

VTP-SERVER(config)#spanning-tree vlan 1 root primary

VTP-SERVER(config)#spanning-tree vlan 50 root primary

VTP-SERVER(config)#spanning-tree vlan 60 root primary

"show spanning-tree" outputs:

Output from VTP-Server:

Output from Client1:

Output from Client2:

Output from Client3:

Can someone please correct the issue?

Thanks in advance.

Regards,

Chandu

Regards, Chandu

Rolf Fischer · ‎01-11-2014

Hi Chandu,

did you create VLANs 50 and 60 on the VTP transparent switches manually (as they won't be learned by VTP)?

Otherwise those VLANs will be partitioned as they simply don't exist on the intermediate switches.

HTH

Rolf

View solution in original post

Rolf Fischer · ‎01-11-2014

Without creating the required VLANs on the intermediate VTP transparent switches, you have 4 isolated local VLANs each for VLAN 50 and 60 without an interconnection ("the VLANs are partitioned"). The trunks on the transparent switches will not process frames tagged for VLANs they don't know.

View solution in original post

Rolf Fischer · ‎01-11-2014

Hi Chandu,

did you create VLANs 50 and 60 on the VTP transparent switches manually (as they won't be learned by VTP)?

Otherwise those VLANs will be partitioned as they simply don't exist on the intermediate switches.

HTH

Rolf

chandra_rc16 · ‎01-11-2014

No,

I didn't created VLANs 50,60 on vtp transparent switches... because the changes done on the domain will won't affect transparent switches and viceversa, right ?

So their duty is just to transfer the frames received on one trunk to other.

Regards,

Chandu

Regards, Chandu

Rolf Fischer · ‎01-11-2014

Without creating the required VLANs on the intermediate VTP transparent switches, you have 4 isolated local VLANs each for VLAN 50 and 60 without an interconnection ("the VLANs are partitioned"). The trunks on the transparent switches will not process frames tagged for VLANs they don't know.

chandra_rc16 · ‎01-11-2014

Perfect - Rolf. Issue resolved.

I understood it. Since both the transparent switches are not having vlan50,60 they are not participating in the STP calculation for those two vlans.

Since those two switches are not participating in the STP calculation. For every switch it seems like it is the only switch in the topology, so STP made them ROOT switches, got it...

Really playing with devices like anything.... but however learning like this is very good...

Thanks a lot for your help again.

Regards,

Chandu

Regards, Chandu

Rolf Fischer · ‎01-11-2014

Chando, thanks for the feedback.

I really enjoy watching your progress ;-)

Regards,

Rolf