Implementation Of Mstp On Devices; Protocols And Standards; Spanning Tree Configuration Task List; Configuration Restrictions And Guidelines - HP 6125G Configuration Manual

Between two MST regions, the packet is forwarded along the CST.
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Implementation of MSTP on devices

MSTP is compatible with STP and RSTP. Devices that are running MSTP and that are used for spanning
tree calculation can identify STP and RSTP protocol packets.
In addition to basic MSTP functions, the following functions are provided for ease of management:
Root bridge hold
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Root bridge backup
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• Root guard
BPDU guard
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Loop guard
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TC-BPDU guard
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Protocols and standards

The spanning tree protocols are documented in the following standards:
IEEE 802.1d, Media Access Control (MAC) Bridges
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IEEE 802.1w, Part 3: Media Access Control (MAC) Bridges—Amendment 2: Rapid Reconfiguration
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• IEEE 802.1s, Virtual Bridged Local Area Networks—Amendment 3: Multiple Spanning Trees

Spanning tree configuration task list

Before configuring a spanning tree, you must determine the spanning tree protocol to be used (STP, RSTP,
or MSTP) and plan the device roles (the root bridge or leaf node).

Configuration restrictions and guidelines

If GVRP and a spanning tree protocol are enabled on a device at the same time, GVRP packets are
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forwarded along the CIST. To advertise a certain VLAN within the network through GVRP, be sure
that this VLAN is mapped to the CIST when you configure the VLAN-to-instance mapping table. For
more information about GVRP, see
The spanning tree configurations are mutually exclusive with any of the following functions on a port:
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service loopback, RRPP, Smart Link, and BPDU tunneling.
The spanning tree configurations made in system view take effect globally. Configurations made in
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Layer 2 Ethernet interface view take effect on the current interface only. Configurations made in
Layer 2 aggregate interface view take effect only on the aggregate interface. Configurations made
on an aggregation member port can take effect only after the port is removed from the aggregation
group.
After you enable a spanning tree protocol on a Layer 2 aggregate interface, the system performs
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spanning tree calculation on the Layer 2 aggregate interface but not on the aggregation member
ports. The spanning tree protocol enable state and forwarding state of each selected member port
is consistent with those of the corresponding Layer 2 aggregate interface.
Though the member ports of an aggregation group do not participate in spanning tree calculation,
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the ports still reserve their spanning tree configurations for participating in spanning tree
calculation after leaving the aggregation group.
"Configuring GVRP."
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