Installation guide

Network Setup
4-128
OperPort PortFast
Bpdu Filter
Displays a portfast BPDU filter for the oper port. The Spanning Tree
Protocol sends BPDUs from all ports.
Enabling the BPDU Filter feature ensures PortFastenabled oper
ports do not transmit or receive BPDUs.
AdminPort PortFast
Bpdu Guard
Displays the AdminPort PortFast BPDU Guard feature.
When set for a bridge, all portfast-enabled ports having the
bpdu-guard set to default shut down the port on receiving the
BPDU. When this occurs, the BPDU is not processed.
OperPort PortFast
Bpdu Guard
Displays the OperPort PortFast BPDU Guard feature.
When the OperPort PortFast BPDU Guard feature is set for a bridge,
all portfast-enabled ports that have the bpdu-guard set to default
shut down the port on receiving a BPDU. When this occurs, the
BPDU is not processed.
Port Version Displays the port version associated with this instance. It can be
either of the following:
•STP
• Reserved
•RSTP
• MSTP
Port State Displays whether each port listed is disabled (not forwarding MST
frames) or in a forwarding mode. A port must be enabled to be able
to forward. For information on enabling a port, see
Configuring a Port on page 4-126.
Port Enable Displays the enable/disable MST designation of each port. A green
check mark indicates the Oper MAC Enable status is active/
enabled. A green checkmark should coincide with a port state of
“forwarding” and a red “X” should coincide with a port state of
disabled.
Port Path Cost Displays the path cost for the specified port index. According to the
original specification, cost is 1,000 Mbps (1 gigabit per second)
divided by the bandwidth of the segment connected to the port.
Therefore, a 10 Mbps connection would have a cost of (1,000/10)
100.
Port Designated Cost Displays the port cost for each port on the switch. The cost helps
determine the role of the port in the MST network. The designated
cost is the cost for a packet to travel from this port to the root in the
MST configuration. The slower the media, the higher the cost.
Designated Port Defines the port connection used to send and receive packets. By
having only one designated port per segment, all looping issues
should be resolved. Once the designated port has been selected,
any other ports that connect to that segment become non-
designated ports and block traffic from taking the defined path.
Forward Transitions Displays the number of frames received on this port and forwarded
by the switch.