I'm currently having issues regarding RSTP on a simple switch network, scenario is as follows. I have 2 switches directly connected to each other over a trunk link (dot1q). These 2 interfaces have the following identical config.
switchport trunk allowed vlan 1
switchport mode trunk
spanning-tree cost 100.
For some reason the 2 switch aren't exchanging STP BPDUs, this has been confirmed in a debug spanning-tree bpdu receive. Configuration on both switches is default apart from spanning-tree mode rstp. Also note that VLAN 1 is the native VLAN for that trunk, I thought that a STP instance would run for VLAN 1.
Show spanning-tree shows that each switch thinks it is the root for VLAN 1 which makes sense considering they are not talking to each other. Any ideas why this is happening?