D-Link xStack DGS-3426G User Manual (English)

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DGS-3426G Layer 2 Gigabit Ethernet Managed Switch

152

STP Port Settings

STP can be set up on a port per port basis. In

addition to setting Spanning Tree parameters

for use on the switch level, the Switch allows

for the configuration of groups of ports, each

port-group of which will have its own

spanning tree, and will require some of its

own configuration settings. An STP Group

will use the switch-level parameters entered

above, with the addition of Port Priority and

Port Cost. An STP Group spanning tree

works in the same way as the switch-level

spanning tree, but the root bridge concept is

replaced with a root port concept. A root port

is a port of the group that is elected based on

port priority and port cost, to be the

connection to the network for the group.

Redundant links will be blocked, just as

redundant links are blocked on the switch

level. The STP on the switch level blocks

redundant links between switches (and

similar network devices). The port level STP

will block redundant links within an STP

Group.

To view this window, click L2 Features >

Spanning Tree > STP Port Settings as

shown on the right:

Figure 3 - 53 STP Port Settings window

It is advisable to define an STP Group to correspond to a VLAN group of ports.

The following STP Port Settings fields can be set:

Parameter Description

Unit

Select the switch in the switch stack to be modified.

From/To

A consecutive group of ports may be configured starting with the selected port.

External Cost

This defines a metric that indicates the relative cost of forwarding packets to the specified

port list. Port cost can be set automatically or as a metric value. The default value is 0 (auto).

0 (auto) – Setting 0 for the external cost will automatically set the speed for forwarding

packets to the specified port(s) in the list for optimal efficiency. Default port cost: 100Mbps

port = 200000. Gigabit port = 20000.

value 1-200000000 – Define a value between 1 and 200000000 to determine the external

cost. The lower the number, the greater the probability the port will be chosen to forward

packets.

Hello Time

The time interval between transmissions of configuration messages by the designated port,

to other devices on the bridged LAN. The user may choose a time between 1 and 10

seconds. The default is 2 seconds. If the inputted Hello Time is greater than 2, the Hello

Time is 2. This field is only operable when the Switch is enabled for MSTP.

Migration

When operating in RSTP mode, selecting yes forces the port that has been selected to

transmit RSTP BPDUs.

Edge

Choosing the True parameter designates the port as an edge port. Edge ports cannot create

loops, however an edge port can lose edge port status if a topology change creates a

potential for a loop. An edge port normally should not receive BPDU packets. If a BPDU

packet is received, it automatically loses edge port status. Choosing the False parameter

indicates that the port does not have edge port status.

P2P

Choosing the True parameter indicates a point-to-point (P2P) shared link. P2P ports are

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D-Link xStack DGS-3426G Specifications

General

MAC Address Table	8K
Power Supply	Internal Power Supply
RAM	128 MB
Flash Memory	16 MB
Layer	Layer 2+
Humidity	10% to 90% non-condensing
VLAN Support	Up to 4K VLANs
Jumbo Frame Support	Yes, up to 9K bytes
Management	Web-based GUI, CLI, SNMP, RMON
QoS Support	Yes
Operating Temperature	0°C to 50°C (32°F to 122°F)
Ports	24 x 10/100/1000BASE-T, 2 x 1000BASE-X SFP
Dimensions	440 x 260 x 44 mm (17.3 x 10.2 x 1.7 inches)
Storage Temperature	-20°C to 70°C (-4°F to 158°F)