I'm not sure about "by default only vlan 1 goes through the trunk..". As far, as I can see, all vlans from 7206 (i.e. gi0/3.xxx) are going through this trunk as I can see at 2950. We are using VTP transparent. The whole schema is working for a long period of time.
I'm writting this from that switch. At this moment I have 34mbps in and 24 mbps out. Last time problem has been occured 7 hours ago. shutdown/no shutdown at 7206 gi0/3 is only one thing that we've made to return connectivity.
I'll probably will do an interfaces change (won't do this btw because we have a number of vlans, that should be renamed in this case) to eliminate hardware problem, but it seems to me, that here are some logical problems, maybe in IOS. But it's hard for me to belive, that in "basic" operation -- switching Cisco make an error.
Anyway. Have no idea yet. While writting this message I have changed the cable between two devices. And after 3 minutes, the problem occured again.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...