Configuring The Spanning Tree; Setting The Spanning Tree Mode - HP A5830 Configuration Manual

If GVRP and a spanning tree protocol are enabled on a device at the same time, GVRP packets are
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 ―Setting the GVRP configuration.‖
The spanning tree configurations are mutually exclusive with any of the following functions on a port:
service loopback, RRPP, Smart Link, and BPDU tunneling.
The spanning tree configurations made in system view take effect globally. Configurations made in Layer
2 Ethernet interface view take effect on the current interface only. Configurations made in port group view
take effect on all member ports in the port group. 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 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, the
ports still reserve their spanning tree configurations for participating in spanning tree calculation after
leaving the aggregation group.

Configuring the spanning tree

Setting the spanning tree mode

The spanning tree modes include:
STP-compatible mode—The device sends STP BPDUs through all ports.

RSTP mode—The device sends RSTP BPDUs through all ports, and ports that connect to STP devices

automatically transitions to the STP-compatible mode.
MSTP mode—The device sends MSTP BPDUs through all ports, and ports that connect to STP devices

automatically transitions to the STP-compatible mode.
PVST mode—The device sends PVST BPDUs through all ports and maintains a spanning tree for

each VLAN. The A5830 Switch Series supports up to 128 VLANs in PVST mode. The maximum
number of VLANs (assume that the number is n) for which PVST can maintain instances varies by
device model. When configuring PVST on devices of different models in a network, to avoid network
failures, be sure that the number of VLANs for which PVST maintains instances does not exceed the
lowest n.
To set the spanning tree mode:
Step...
1. Enter system view
2. Set the spanning tree mode
Whether you must specify the MSTI or VLAN for the spanning tree configuration varies with the spanning
tree modes:
Command...
system-view
stp mode { stp | rstp | mstp | pvst }
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Remarks
—
Required
MSTP mode by default