I just got 2 new C2960 Switches and want to set up "switchport mode trunk" for f0/48 of sw1 connects to f0/47 of sw2. On sw1, I configured vtp mode as server and the domain name as c2960. and I think the encapuslation is 802.1q by default(it's not configurable). But,
1. once I connect two switches, sw2 got vtp domain even it's on server mode, but no VLAN advertisement recieved.
2. after configuring the vtp mode as client and the domain name as c2960 on sw2 which same as sw1, it sitll can't get the VLAN advert from sw1.
3. when I configure the duplex full for both trunking interfaces on sw1 and sw2, all the interfaces went down. I have to use duplex auto. why?
Please advise, thank you.
Check Version of VTP for each switch, also
check your trunk and make sure trunking is working
show vtp statu
show interfaces trunk
Can you check the revision number in the output of a "sh vtp status" on SW1 and ensure that it is higher than the revision number on SW2. If it is the same modify the vlan database on sw1.