Moxa-technologies Moxa EtherDevice Switch EDS-405A Instrukcja Użytkownika Pobierz pdf (Strona 47)

EDS-408A/405A Series User’s Manual Featured Functions

3-32

has a port cost of 100 and is automatically blocked because the other Switch-to-Switch

connections have a port cost of 36 (18+18). This means that both VLANs are now

subdivided—VLAN 1 on Switch units A and B cannot communicate with VLAN 1 on Switch C,

and VLAN 2 on Switch units A and C cannot communicate with VLAN 2 on Switch B.

Block

Switch A

Switch B Switch C

VLAN1

VLAN2

802.1Q tagged,

10BaseTx

half-duplex Link

carries VLAN1, 2

(path cost = 100)

100BaseTX

full-duplex Link;

only carries VLAN2

(path cost = 18)

100BaseTX

full-duplex Link;

only carries VLAN1

(path cost = 18)

VLAN1

VLAN2

VLAN1

VLAN2

To avoid subdividing VLANs, all inter-switch connections should be made members of all

available 802.1Q VLANs. This will ensure connectivity at all times. For example, the connections

between Switches A and B, and between Switches A and C should be 802.1Q tagged and carrying

VLANs 1 and 2 to ensure connectivity.

Configuring STP/RSTP

The following figures indicate the Spanning Tree Protocol parameters that can be configured. A

more detailed explanation of each parameter is given below the figure. (NOTE: The user interface

for EDS-408A shows 8 ports.)

At the top of this page, the user can check the Current Status of this function. For RSTP, you will

see:

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 81 82

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Moxa-technologies Moxa EtherDevice Switch EDS-405A Instrukcja Użytkownika Strona 47