Rockwell Automation 1783-EMS08T Stratix 6000 Ethernet Managed Switch User Manual - Manual (Page 56)

56 Rockwell Automation Publication 1783-UM001D-EN-P - January 2013
Chapter 4 Switch Management
3. Configure port parameters as described in the table below.
4. Click Apply Changes.
The changes will take effect immediately without requiring you to cycle
power to the switch.
Port Parameter Description
Priority Type a hex value from 00h…F0h to specify the port priority. The port priority is used in
conjunction with the path cost to determine which redundant port on the network will be
blocked.
The default value for each port is 80.
Auto Cost Check this box to automatically configure the path cost according to the port speed. The
port speed can be 10 MB/s, 100 MB/s, or 1 GB/s depending on the connected device.
Auto Cost is the default configuration setting.
Manual Cost If you cleared the Auto Cost checkbox, type a value from 1…200,000,000 to manually
configure the path cost.
The default value is 200,000,000.
Edge Port Click the method for determining whether the port identifies itself as an edge port.
Because edge ports cannot create bridging loops in the network, they transition directly to
the forwarding state and function much faster than a normal spanning tree port.
• OFF—The port functions as a normal spanning tree port. When an end station is
connected to the port, the port begins forwarding after the Max Age + Forward Delay =
20 + 15 = 35 seconds.
• Auto—The switch automatically identifies whether the port is connected to an end
station or switch. This is the default setting.
– If an end station is connected to the port, the port is identified as an edge port after 3
seconds and begins forwarding BPDUs.
– If a switch is connected to the port and a BPTU is received, the port immediately
loses edge port status and becomes a normal spanning tree port. When BPTUs are no
longer received after 3 seconds, the port regains edge port status.
• ON—The switch automatically identifies whether the port is connected to an end
station or switch. If an end station is connected to the port, the port is immediately
identified as an edge port.
IMPORTANT: Only use the ON mode for ports connected to a single host. Connecting
hubs, concentrators, switches, or bridges to a port in ON mode can cause temporary
bridging loops. Use this setting with caution.