Quanta Cloud Technology QuantaMesh QNOS5, Configuration Manual

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Multiple Spanning Tree (MSTP) operation maps VLANs to spanning tree instances. Packets assigned to
various VLANs are transmitted along different paths within MSTP Regions (MST Regions). Regions are one
or more interconnected MSTP bridges with identical MSTP settings. The MSTP standard lets administrators
assign VLAN traffic to unique paths.
The switch supports IEEE 802.1Q-2005, which is a version of corrects problems associated with the previous
version, provides for faster transition-to-forwarding, and incorporates new features for a port (restricted
role and restricted TCN).
1.1.7. Bridge Protocol Data Unit (BPDU) Guard
Spanning Tree BPDU Guard is used to disable the port in case a new device tries to enter the already
existing topology of STP. Thus devices, which were originally not a part of STP, are not allowed to influence
the STP topology.
1.1.8. BPDU Filtering
When spanning tree is disabled on a port, the BPDU Filtering feature allows BPDU packets received on that
port to be dropped. Additionally, the BPDU Filtering feature prevents a port in Port Fast mode from sending
and receiving BPDUs. A port in Port Fast mode is automatically placed in the forwarding state when the link
is up to increase convergence time.
1.1.9. Port-channel
Up to 32 ports can combine to form a single Port-Channel. This enables fault tolerance protection from
physical link disruption, higher bandwidth connections and improved bandwidth granularity.
A Port-channel is composed of ports of the same speed, set to full-duplex operation.
1.1.10. Link Aggregate Control Protocol (LACP)
Link Aggregate Control Protocol (LACP) uses peer exchanges across links to determine, on an ongoing basis,
the aggregation capability of various links, and continuously provides the maximum level of aggregation
capability achievable between a given pair of systems. LACP automatically determines, configures, binds,
and monitors the binding of ports to aggregators within the system.
1.1.11. Multi Chass Link Aggregation Group (MLAG)
This feature enables a Port-channel to be created across two independent units, which creates a scenario
where some member ports of the MLAG can reside on one unit and the other members of the MLAG can
reside on the other unit. The partner device on the remote side can be a MLAG unaware unit. For the MLAG
unaware unit, the MLAG appears to be a single Port-channel connected to a single unit.
1.1.12. Flow Control Support (IEEE 802.3x)