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DGS-3312SR
Инструкция по эксплуатации Страница: 95

D-Link DGS-3312SR Инструкция по эксплуатации онлайн [95/290] 12494

DGS-3312SR Stackable Gigabit Layer 3 Switch

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.

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

The following fields can be set:

Parameter Description

Unit

Choose the Switch ID number of 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 (0 =

Auto)

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

will be chosen to forward packets.

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

Hello Time

The time interval between the transmission of configuration messages by the des-

ignated port, to other devices on the bridged LAN, thus stating that the Switch is still

functioning. The user may choose a time between 1 and 10 seconds. The default is 2

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

Migrate

Setting this parameter as "yes" will set the ports to send out BDPU packets to other

bridges, requesting information on their STP setting If the Switch is configured for

RSTP, the port will be capable to migrate from 802.1d STP to 802.1w RSTP. If the

Switch is configured for MSTP, the port is capable of migrating from 802.1d STP to

or segments that are capable of being upgraded to

802.1s MSTP. RSTP and MSTP can coexist with standard STP, however the benefits

of RSTP and MSTP are not realized on a port where an 802.1d network connects to

an 802.1w or 802.1s enabled network. Migration should be set as yes on ports

connected to network stations

802.1w RSTP or 802.1s MSTP on all or some portion of the segment.

Edge

Choosing the true parame

create loops, however an

ter designates the port as an edge port. Edge ports cannot

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 similar to edge ports, however they are restricted in that a P2P port must operate

in full-duplex. Like edge ports, P2P ports transition to a forwarding state rapidly thus

benefiting from RSTP. A p2p value of false indicates that the port cannot have p2p

status. Auto allows the port to have p2p status whenever possible and operate as if

the p2p status were true. If the port cannot maintain this status, (for example if the

port is forced to half-duplex operation) the p2p status changes to operate as if the p2p

value were False. The default setting for this parameter is True.

State

This drop-down menu allows you to enable or disable STP for the selected group of

ports. The default is Enabled.

Click Apply to implement changes made.

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