Cisco SGE2000 - Cisco - Gigabit Switch Administration Guide

Configuring Spanning Tree
Defining Spanning Tree
Cisco Small Business SFE/SGE Managed Switches Administration Guide 257
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- Auto — Enables Port Fast mode a few seconds after the interface
becomes active.
• Enable Root Guard — Enable the prevention of a devices outside the network
core from being assigned the spanning tree root. The possible field values are:
- Checked — Enables Root Guard on the selected port or LAG.
- Unchecked — Disables Root Guard on the selected port or LAG. This is
the default value.
• Enable BPDU Guard — Protects the network from invalid configurations. The
possible field values are:
- Checked — Enables BPDU Guard on the selected port or LAG.
- Unchecked — Disables BPDU Guard on the selected port or LAG. This is
the default value.
• Port State — Displays the current STP state of a port. If enabled, the port state
determines what forwarding action is taken on traffic. Possible port states are:
- Disabled — Indicates that STP is currently disabled on the port. The port
forwards traffic while learning MAC addresses.
- Blocking — Indicates that the port is currently blocked and cannot
forward traffic or learn MAC addresses.
- Listening — Indicates that the port is in Listening mode. The port cannot
forward traffic nor can it learn MAC addresses.
- Learning — Indicates that the port is in Learning mode. The port cannot
forward traffic, however it can learn new MAC addresses.
- Forwarding — Indicates that the port is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
• Speed — Indicates the speed at which the port is operating.
• Path Cost — Defines the port contribution to the root path cost. The path cost
is adjusted to a higher or lower value, and is used to forward traffic when a path
being rerouted.
• Default Path Cost — Defines the default path cost as the Path Cost field
setting. The possible field values are:
- Checked — Path Cost is the default value.
- Unchecked — Path Cost is user-defined.

Cisco SGE2000 - Cisco - Gigabit Switch Specifications

General

Form Factor	Rack-mountable
Switching Capacity	48 Gbps
Forwarding Rate	35.7 Mpps
Layer	Layer 2
Power Supply	Internal
Management	Web-based, SNMP, CLI
MAC Address Table Size	8000 entries
VLANs	256
Features	Quality of Service (QoS), IGMP snooping, Port mirroring
Dimensions (W x D x H)	440 x 257 x 44 mm (17.3 x 10.1 x 1.73 in)
Operating Temperature	0°C to 40°C (32°F to 104°F)
Storage Temperature	-20 to 70°C (-4 to 158°F)
Relative Humidity	10% to 90% non-condensing
Standards Compliance	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3x