Enterasys S8 switch shows tbp port

When I see "
sh port status"
on Enterasys s8 switch, it given me list of tbp ports as follows:
tbp.0.1  down  up  other  tbp.0.2  down  up  other  tbp.0.3  down  up  other  tbp.0.4  down  up  other  tbp.0.5  down  up  other  tbp.0.6  down  up  other  
[/code]what are these tbp ports?

Currenty switch Chassis Firmware version is ""

2 replies

Userlevel 4
Tunnel bridge port. Used for terminating tunnels.
thanks curt....
as this come after upgrading the firmware....