3Com 2928 User Guide - Page 229

Select a port (GigabitEthernet 1/0/16 for example) on the chassis front panel (If aggregate interfaces are configured on the device, the page displays a list of aggregate interfaces below the chassis front panel. You can select aggregate interfaces from this list). The lower part of the page displays the MSTP information of the port in MSTI 0 (when STP is enabled globally) or the STP status and statistics (when STP is not enabled globally), the MSTI to which the port belongs, and the path cost and priority of the port in the MSTI. Table 1-12 describes fields in the displayed MSTP information of GigabitEthernet 1/0/16 in MSTI 0. Table 1-12 Fields in the displayed MSTP information of GigabitEthernet 1/0/16 in MSTI 0 Field [FORWARDING] [LEARNING] [DISCARDING] [DOWN] Port Protocol Port Role Port Priority Port Cost(Legacy) Desg. Bridge/Port Port Edged Point-to-point Transmit Limit Protection Type MST BPDU Format Port ConfigDigest-Snooping Rapid transition Description The port is in forwarding state: The port learns MAC addresses and forwards user traffic The port is in learning state: The port learns MAC addresses but does not forward user traffic The port is in discarding state: The port does not learn MAC addresses or forward user traffic The port is down Whether STP is enabled on the port The role of the port, which can be Alternate, Backup, Root, Designated, Master, or Disabled The priority of the port Path cost of the port. The field in the bracket indicates the standard used for port path cost calculation, which can be legacy, dot1d-1998, or dot1t. Config indicates the configured value, and Active indicates the actual value. Designated bridge ID and port ID of the port The port ID displayed is insignificant for a port that does not support port priority. Whether the port is an edge port: z Config indicates the configured value z Active indicates the actual value. Whether the port is connected to a point-to-point link: z Config indicates the configured value z Active indicates the actual value. The maximum number of packets sent within each Hello time Protection type on the port, which can be one of the following: z Root: Root guard z Loop: Loop guard z BPDU: BPDU guard z None: No protection Format of the MST BPDUs that the port can send, which can be legacy or 802.1s. Config indicates the configured value, and Active indicates the actual value. Whether digest snooping is enabled on the port Whether the current port rapidly transitions to the forwarding state 1-22