The motherboard issue cannot be ruled out but personally, I don't quite think this is a motherboard issue. The VLAN management is primarily a software issue and it is all concerned with storing the vlan.dat file properly on the CF card and using it to set up the ESW module.
Does the 2811 run the VTP protocol in any mode? If the VTP is not used then I suggest setting the device to VTP Transparent mode.
You have said that you remedy the problem by deleting the vlan.dat from the CF and copy it back (from where?). However, there is a slight possibility that the vlan.dat file you are putting back is internally corrupted. Have you ever tried not to copy that file back but simply delete it, restart the router (an important step!) and then recreating all the necessary VLANs from scratch?
Also, when this problem appears, have you tried to see if there is a free space available on the CF? A full CF may also cause these troubles.
As a last measure - I doubt it will help but who knows - have you tried replacing the ESW module?
If I remember right the problem was due to the fact that the "vlan.dat" file on the flash was getting corrupted. The problem was finally traced to a non-Cisco supplied Compact Flash. The 3rd party Compact Flash was the reason for the problem as far as I can recall.
Somehow I can't see this fault being a flash issue as the router is not being re-loaded and the vlan is already established, the router just removes it after a period of time. This to me appears to be a resource issue although I cannot see any resource that is being used to cause this, we monitor out 1941's with Solarwinds and there are no increases in memory or CPU prior to the vlan being removed.
We are currently running Cisco 1941 ISR's with 4 port ESW cards IOS version 15.1(4) M3 and a straight forward reload temporally fixes the issue, hence not a flash or vlan.dat issue.
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
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...