Dell Force10 S4810P Configuration Guide

1010 | Spanning Tree Protocol (STP)
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View the current values for global parameters using the show spanning-tree 0 command from EXEC
privilege mode. Refer to the second example in Enabling Spanning Tree Protocol Globally.
Modifying Interface STP Parameters
You can set the port cost and port priority values of interfaces in Layer 2 mode.
• Port cost is a value that is based on the interface type. The greater the port cost, the less likely the port
will be selected to be a forwarding port.
• Port priority influences the likelihood that a port will be selected to be a forwarding port in case that
several ports have the same port cost.
The default values are listed in Table 49-2.
To change the port cost or priority of an interface:
View the current values for interface parameters using the
show spanning-tree 0 command from EXEC
privilege mode.Refer to the second example in Enabling Spanning Tree Protocol Globally.
Enabling PortFast
The PortFast feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner.
Interfaces forward frames by default until they receive a BPDU that indicates that they should behave
otherwise; they do not go through the Learning and Listening states. The
bpduguard shutdown-on-violation
option causes the interface hardware to be shutdown when it receives a BPDU. When only
bpduguard is
implemented, although the interface is placed in an Error Disabled state when receiving the BPDU, the
physical interface remains up and spanning-tree will drop
packets in the hardware after a BPDU violation.
BPDUs are dropped in the software after receiving the BPDU violation.
Task Command Syntax Command Mode
Change the port cost of an interface.
Range: 0 to 65535
Default: see Table 49-2.
spanning-tree 0 cost cost INTERFACE
Change the port priority of an interface.
Range: 0 to 15
Default: 8
spanning-tree 0 priority
priority-value
INTERFACE
Caution: Enable PortFast only on links connecting to an end station. PortFast can cause loops if it is enabled on an
interface connected to a network.

Dell Force10 S4810P Specifications

General

Switching Capacity	1.28 Tbps
Forwarding Rate	952 Mpps
Manageable	Yes
Jumbo Frame Support	Yes
Jumbo Frame Size	9216 bytes
Input Voltage	100-240 VAC
Form Factor	Rack-mountable
Rack Height	1U
Power Supply	Dual, Hot-swappable
Product Type	Switch
Operating Temperature	32°F to 104°F (0°C to 40°C)
Operating Humidity	10% to 90% (non-condensing)
Latency	480 ns
MAC Address Table Size	128K entries