Protocols And Standards; General Configuration Restrictions And Guidelines - H3C S7500E-X Configuration Manual

In addition to basic MSTP features, the following features are provided for ease of management:
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Root bridge hold
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Root bridge backup
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Root guard
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BPDU guard
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Loop guard
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TC-BPDU guard
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Port role restriction
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TC-BPDU transmission restriction
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Support for hot swapping of interface cards and active/standby changeover.

Protocols and standards

MSTP is documented in the following protocols and standards:
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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
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IEEE 802.1Q-REV/D1.3, Media Access Control (MAC) Bridges and Virtual Bridged Local Area
Networks —Clause 13: Spanning tree Protocols

General configuration restrictions and guidelines

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In an IRF 3 system, a device in PVST mode can maintain a maximum of 254 spanning trees. If
a PVST device is not in an IRF 3 system, it can maintain a maximum of 510 spanning trees.
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If both MVRP and spanning tree are enabled on a network, MVRP packets are forwarded along
MSTIs. To advertise a specific VLAN within the network through MVRP, make sure this VLAN is
mapped to an MSTI when you configure the VLAN-to-instance mapping table. For more
information about MVRP, see
•
To connect a spanning tree network to a TRILL network, make sure the following requirements
are met:
The spanning tree protocol is disabled on the TRILL network.
An edge port is used to connect the spanning tree network to the TRILL network. The edge
port can quickly transit to the forwarding state. This prevents network topology changes
from influencing the TRILL network.
For more information about TRILL, see TRILL Configuration Guide.
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The spanning tree configurations are mutually exclusive with service loopback, RRPP, and
Smart Link on a port.
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Configurations made in system view take effect globally. Configurations made in Ethernet
interface view take effect only on the interface. 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 spanning tree calculation only on the Layer 2 aggregate interface. It does not perform
spanning tree calculation on the aggregation member ports. The spanning tree protocol state
and forwarding state of each selected member port are consistent with those of the
corresponding Layer 2 aggregate interface.
"Configuring MVRP."
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