you mean the switch that is trunking with this port uses vlan1 as native vlan ?
Yes, you can verify with the commands:
show interface fx/x switchport
or
show interface trunk
Also what is the benefit of port putting itself into that VLAN when trunking is broken since other vlans cannot passthrough anyways ?
I'm not sure what you mean about benefit. It's your typical Vlan membership configuration. Deciding what port each switchport belongs to in access mode is part of a design - not a benefit. Based on the configuration, Vlan 241 must have a special meaning on the switch and that's the Vlan to use of the port fails its trunk negotiation.
Other Vlans may not pass thru since the trunk is broken but it doesn't mean the interface is down/down state. If the interface is up/up, you can still communicate via Vlan 241.
HTH,
__
Edison.
