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Manageable Mosaic switch Installation and User Guide
This is equivalent to the native VLAN in Cisco terminology.
To Configure Transparent VID:
1. Click on the Features icon and select the from the Features menu the
Transparent VID tab.
2. Check Enable to activate the Transparent VID feature.
3. Enter the VID and check the appropriate ports.
4. When finished, Click Apply, and on the confirmation box, click Yes.
3.6.7 Rapid Spanning Tree Protocol (RSTP) Configuration
The manageable Mosaic switch supports the Spanning Tree Protocol (IEEE 802.1D) and the Rapid
Spanning Tree Protocol (IEEE 802.1w), which prevent loops in the network while enabling path
redundancy links.
The Spanning Tree Protocol (STP) is a link layer network protocol that ensures a loop-free topology for
any bridged LAN. Spanning tree allows a network design to include spare (redundant) links to provide
automatic backup paths if an active link fails, without the danger of bridge loops, or the need for manual
enabling/disabling of these backup links.
NOTE: Bridge loops must be avoided because they result in flooding the network.
The STP creates a meshed network of connected Layer 2 bridges (typically Ethernet switches), and
disables those links that are not part of the tree, leaving a single active path between any two network
nodes.
The IEEE 802.1w introduced an evolution of the STP, known as Rapid Spanning Tree Protocol (RSTP).
RSTP provides faster spanning tree convergence after a topology change. Standard IEEE 802.1D now
incorporates RSTP, making STP obsolete.
While STP can take between 30 and 50 seconds to respond to a topology change, RSTP typically
responds to changes within 3*Hello, where the default is less than 10 seconds.
The RSTP provides rapid convergence of the spanning tree by assigning port roles. Using handshake
and based on the IEEE 802.1D STP, it selects the switch with the highest switch priority (lowest
numerical priority value) as the root switch and a root port - this port provides the best path (lowest cost)
when the switch forwards packets to the root switch.
The manageable Mosaic switch operates in RSTP with backwards compatibility to STP. It will change to
STP after receiving STP BPDUs.
Note: In the manageable Mosaic switch, the Spanning Tree disregards VLAN
configuration, i.e. loops are detected even between ports configured to different VLANs.
SUMMARY
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