Netgear XS728T – ProSAFE® 10 Gigabit Smart Managed Switch Guia Do Administrador

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In the Authentication List screen, configure the default list to use RADIUS as the first 

authentication method. 

128. 

This example enables 802.1x-based port security on the switch and prompts the hosts 
connected on ports xg1–xg8 for an 802.1x-based authentication. The switch passes the 
authentication information to the configured RADIUS server.

Spanning Tree Protocol (STP) runs on bridged networks to help eliminate loops. If a bridge 
loop occurs, the network can become flooded with traffic. IEEE 802.1s Multiple Spanning 
Tree Protocol (MSTP) supports multiple instances of spanning tree to efficiently channel 
VLAN traffic over different interfaces. Each instance of the spanning tree behaves in the 
manner specified in IEEE 802.1w, Rapid Spanning Tree, with slight modifications in the 
working but not the end effect (chief among the effects is the rapid transitioning of the port to 
the forwarding state). 

The difference between the RSTP and the traditional STP (IEEE 802.1D) is the ability to 
configure and recognize full-duplex connectivity and ports that are connected to end stations, 
resulting in rapid transitioning of the port to the forwarding state and the suppression of 
topology change notification. These features are represented by the parameters 
point-to-point and edgeport. MSTP is compatible with both RSTP and STP and behaves 
appropriately to STP and RSTP bridges.

An MSTP bridge can be configured to behave entirely as an RSTP bridge or an STP bridge. 

So, an IEEE 802.1s bridge inherently also supports IEEE 802.1w and IEEE 802.1D.

The MSTP algorithm and protocol provide simple and full connectivity for frames assigned to 
any given VLAN throughout a bridged LAN comprising arbitrarily interconnected networking 
devices, each operating MSTP, STP, or RSTP. MSTP enables frames assigned to different 
VLANs to follow separate paths, each based on an independent Multiple Spanning Tree 
Instance (MSTI), within Multiple Spanning Tree (MST) regions composed of LANs and or 
MSTP bridges. These regions and the other bridges and LANs are connected into a single 
common spanning tree (CST). (IEEE DRAFT P802.1s/D13).

MSTP connects all bridges and LANs with a single Common and Internal Spanning Tree 
(CIST). The CIST supports the automatic determination of each MST region, choosing its 
maximum extent. The connectivity calculated for the CIST provides the CST for 
interconnecting these regions, and an Internal Spanning Tree (IST) within each region. 
MSTP ensures that frames with a given VLAN ID are assigned to only one of the MSTIs or 
the IST within the region, that the assignment is consistent among all the networking devices 
in the region, and that the stable connectivity of each MSTI and IST at the boundary of the 
region matches that of the CST. The stable active topology of the bridged LAN with respect to 
frames consistently classified as belonging to any given VLAN thus simply and fully connects