Chapter 3 Featured Functions
3-53
Item Description
Port Cost
Leave the default path cost, or enter a new path cost that is used for
the interface in the MST instance. Enter a number in the range of 1
to 200,000,000. Enter zero (0) to reset the path cost.
Note:
The default path cost is 20,000 for a Gigabit Ethernet
interface
Port Mode
Specify the administrative mode for the interface in the MST
instance.
Enable: Enables STP for the interface. This is the default setting.
Disable: Disables STP for the interface.
Auto Calculated Port
Path Cost
This field displays whether you have globally enabled or you can
disabled the dynamic path cost on the CST Configuration screen
Port Id
The port identifier, which consists of the port priority and the
interface number.
Note:
LAGs have their own interface number, starting from 25 in
decimal value (which is 19 in hexadecimal value).
Port Forwarding
State
The forwarding state of the interface in the MST instance. One of the
following options is displayed:
Discarding: The interface is in the discarding mode; it cannot
forward traffic and cannot learn new MAC addresses.
Learning: The interface is in the learning mode; it cannot forward
traffic, but it can learn new MAC addresses.
Forwarding: The interface is in the forwarding mode; it can
forward traffic and learn new MAC addresses.
Port Role
The type of role of the interface in the MST instance: One of the
following options is displayed:
Root
Master
Designated
Alternate
Backup
Disabled
Designated Root
The identifier of the root bridge in the MST instance. The identifier
consists of the bridge priority and the base MAC address of the MST
root bridge.
Designated Cost
The path cost that is advertized by the designated port to the LAN.
Note:
Interfaces with a lower cost are less likely to be blocked if
MST detects loops.
Designated Bridge
The identifier of the bridge with the designated port. The identifier
consists of the bridge priority and the base MAC address of the MST
bridge.
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