Dell PowerConnect 3548 User Manual

Configuring Switch Information 337
• Root Guard — Prevents devices outside the network core from being assigned the spanning tree root.
– Checked — Root guard is enabled on the port.
–
Unchecked — Root guard is disabled on the port.
•
LAG State — Current STP state of a LAG. If enabled, the LAG state determines what forwarding
action is taken on traffic. If the bridge discovers a malfunctioning LAG, the LAG is placed in the
Broken state. Possible LAG states are:
–
Disabled — STP is currently disabled on the LAG. The LAG forwards traffic while learning
MAC addresses.
–
Blocking — The LAG is blocked and cannot be used to forward traffic or learn MAC addresses.
–
RSTP Discarding State — In this state the port does not learn MAC addresses and do not forward
frames.
– This state is union of Blocking, and Listening state introduced in STP (802.1.D).
–
Listening — The LAG is in the listening mode and cannot forward traffic or learn MAC addresses.
–
Learning — The LAG is in the learning mode and cannot forward traffic, but it can learn new
MAC addresses.
–
Forwarding — The LAG is currently in the forwarding mode, and it can forward traffic and learn
new MAC addresses.
–
Broken — The LAG is currently malfunctioning and cannot be used for forwarding traffic.
•
Role — Indicates the LAG role assigned by the STP algorithm that provides STP paths. The possible
field values are:
–
Root — Provides the lowest cost path to forward packets to root switch.
–
Designated — Indicates that the via which the designated switch is attached to the LAN.
–
Alternate — Provides an alternate LAG to the root switch from the root interface.
–
Backup — Provides a backup path to the designated port path toward the Spanning Tree leaves.
Backup ports occur only when two ports are connected in a loop by a point-to-point link. Backup
ports also occur when a LAN has two or more connections connected to a shared segment.
–
Disabled — Indicates the LAG is not participating in the Spanning Tree.
•
Path Cost (1-200000000) — Amount the LAG contributes 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 is being rerouted.
The path cost has a value of 1 to 200000000.
•
Default Path Cost — Indicates if the device uses the default path cost. The possible field values are:
–
Checked — Device uses the default path cost.
–
Unchecked — Device uses path cost defined in the Path Cost field above.
•
Priority — Priority value of the LAG. The priority value influences the LAG choice when a bridge has
looped ports. The priority value is between 0-240, in steps of 16.
•
Designated Bridge ID — The priority and the MAC Address of the designated bridge.

Dell PowerConnect 3548 Specifications

General

MAC address table	8000 entries
Maximum data transfer rate	0.1 Gbit/s
Supported data transfer rates	10/100 Mbps
10G support	-
Number of VLANs	256
Flow control support	Yes
Networking standards	IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.3ad
Dimensions (WxDxH)	440 x 257 x 43.2 mm
Networking features	Gigabit Ethernet, Fast Ethernet
Authentication method	RADIUS, TACACS+
Connectivity technology	Wired
Switch type	Managed
Switch layer	L2
Data link protocols	Ethernet
Supported network protocols	HTTP, HTTPS/SSL, SSH
Power connector	DC-in jack
SFP/SFP+ slots quantity	2
Basic switching RJ-45 Ethernet ports quantity	48
Product color	Black
Storage temperature (T-T)	-20 - 70 °C
Operating temperature (T-T)	0 - 45 °C
Storage relative humidity (H-H)	10 - 95 %
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Weight	8000 g