EDS-518A Series User’s Manual | Featured Functions |
The following figure shows an example of a network that contains VLANs 1 and 2. The VLANs are connected using the 802.1Q-tagged link between Switch B and Switch C. By default, this link 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.
100BaseTX full-duplex Link; only carries VLAN1 (path cost = 18)
VLAN1
VLAN2
Switch A
VLAN1
VLAN2
Switch B
Block
| 802.1Q tagged, | VLAN1 |
| VLAN2 |
| 10BaseTx |
| half-duplex Link | |
| carries VLAN1, 2 | |
| (path cost = 100) | |
100BaseTX full-duplex Link; only carries VLAN2 (path cost = 18)
Switch C
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.
See the “Configuring Virtual LANs” section for more information about VLAN Tagging.
Configuring STP/RSTP
The following figures indicate which Spanning Tree Protocol parameters can be configured. A more detailed explanation of each parameter follows.
At the top of this page, the user can check the “Current Status” of this function. For RSTP, you will see:
