Our network runs in one VTP domain. All switches are Cat6500 (ISO) sup2 or sup720. All is working in Layer 2.
We are using vlans above 1000 which cannot be propagated by VTP and needs to be configured by hand on every switch. We changed the VTP domain so every 6500 switch was its own VTP domain and then trouble started ... something strange occured. The MAC addresses were not propagated to other switches in vlan (layer 2 only vlan). Putting static entries did not solve the problem. The MAC addresses in the same VLAN were only propagated from access1(VTP access1) to core1(VTP core1),but not to the access2 (VTP access2). Same thing the other way.
On switches that we didnt change vtp, everything worked fine. After couple of hours trying to solve the problem, I changed back to same VTP domain for all switches and MACs starts propagate.
Hi, Thanks for an replay. But there is something more strange about it. After a change most vlans did talk to each other even if they were in different domains, but only one did not work,layer 2 Vlan. We have 3 switches connected. SwitchA(vtp domain A)-SwitchB(vtp domain B)-SwitchC(vtp domain C). MACs from switchA went to switch B but could not appear on switch C. All are connected by trunks 802.1q, all vlans allowed,VTP version 2. Any ideas ?
The VTP does not limit the communication between VLANs (using layer 3). It limits rather the adverstisements to the switches in the VTP domain. VTP handles information about VLANs in the VTP domain and ensure VLAN database consistency between the different switches IN THE SAME VTP DOMAIN.
Since you've VLANs configured on the different switches, it is a good idea to verify if you have configured the same VLAN (Layer 2) on the three switches and if that the ... MAC adresses belong to the same VLAN... since the broadcast domain is limited to the VLAN and the MAC adresses will be propagated only to the ports belonging to the same VLAN in the different switches through the trun links.
...But please notice that these are two different issues.
Thx for replay.Situation here is slitly different, cause all switches were in the same VTP domain before the change, and all have the same VLAN database. After a change of a VTP domain (each switch was its own VTP domain, but has the same VLANs learned from old VTP domain as client) only one VLAN 901 - layer 2 only had a problem. Other VLANs worked well. Maybe its becouse there was no routing running between them ? But then, those VLANs are the same, same names, so what stops learnig of the MAC addresses in the same layer 2 VLAN ?? Anyone has any idea ?
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.