Do you have a WLSE? If so, does it have a Radio Scan scheduled for this time? We have seen the WLSE radio scan cause issues for AP rebooting like this. Problem appears to be resolved when we upgraded the AP to 12.3(7)JA2.
A dribble condition occurs when the router detects a packet that is slightly larger than specification allows. The router will forward the packet and increment the dribble condition counter.
What is the cpu utilization on the router & switch during peak time? I've seen routers start dropping packets when trying to maintain routing tables during peak traffic due to heavy cpu utilization. This can occur if you have alot of subinterfaces ...
I recently saw something like this on a Catalyst 4006. The Gigabit Ethernet port showed status "connected" with link light on but the other side of the cable showed "not connected". Neither swapping the GBIC or the Gigabit Module solved the problem...
To change the native vlan on a trunked port on a catalyst, you simply change the vlan on the port. For example, to set the trunking on port 2/1 on a switch to trunk VLAN 100 using native vlan 2, you would enter...set vlan 2set trunk 2/1 on dot1qset ...