CCIE Routing & Switching by Wendell Odom says on P.38 Table 2-3 that VTP Client mode does not save the VLAN config to NVRAM or vlan.dat .
However, I have 2x 3550 switches and when I boot my client up without the server I still have all the vlan info that has been learned from the VTP Server. Can I take it that the client does store the VLAN config in vlan.dat ?
"This switch was previously used in the lab, and a good VTP domain name was entered. It was configured as a VTP client and was connected to the rest of the network. Then, the ISL link was brought up to the rest of the network. In just a few seconds, the whole network is down. What could have happened?
The configuration revision of the switch you inserted was higher than the configuration revision of the VTP domain. Therefore, your recently-introduced switch, with almost no configured VLANs, has erased all VLANs through the VTP domain.
This happens whether the switch is a VTP client or a VTP server. A VTP client can erase VLAN information on a VTP server. You can tell that this has happened when many of the ports in your network go into inactive state but continue to be assigned to a nonexistent VLAN."
This indicates that the configuration number is indeed stored somewhere and that this alone would make no sense unless it stored the vlan information for that revision number.
I have since run a test on my VTP client and a vlan.dat file is created and indeed reappears on boot up.
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.