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• Support for hot swapping of interface cards and active/standby changeover
Protocols and standards
• IEEE 802.1d, Spanning Tree Protocol
• IEEE 802.1w, Rapid Spanning Tree Protocol
• IEEE 802.1s, Multiple Spanning Tree Protocol
Configuration restrictions and guidelines
When you configure MSTP, follow these restrictions and guidelines:
• Two or more MSTP-enabled devices belong to the same MST region only if they are configured
with the same format selector (0 by default, not configurable), MST region name,
VLAN-to-instance mapping entries in the MST region, and MST region revision level, and they
are interconnected through physical links.
• After specifying the current device as the root bridge or a secondary root bridge, you cannot
change the priority of the device.
• If two or more devices with the same bridge priority have been designated to be root bridges of
the same spanning tree instance, MSTP will select the device with the lowest MAC address as
the root bridge.
• The values of forward delay, hello time, and max age are interdependent. Incorrect settings of
these values might cause network flapping. Hewlett Packard Enterprise recommends you to set
the network diameter and let the device automatically set an optimal hello time, forward delay,
and max age. The settings of hello time, forward delay and max age must meet the following
formulae:
2 × (forward delay – 1 second) ú max age
Max age ú 2 × (hello time + 1 second)
• If the device is not enabled with BPDU guard, when an edge port receives a BPDU from another
port, it transits into a non-edge port. To restore its port role as an edge port, you must restart the
port.
• Configure ports that are directly connected to terminals as edge ports and enable BPDU guard
for them. In this way, these ports can rapidly transit to the forwarding state, and network security
can be ensured.
Recommended MSTP configuration procedure
Before you configure MSTP, you must determine the role of each device in each MSTI: root bridge or
leaf node. In each MSTI, one, and only one device acts as the root bridge, and all others as leaf
nodes.
Follow these steps to configure MSTP:
Step Remarks
1. Configuring an MST
region.
Optional.
Configure the MST region-related parameters and VLAN-to-instance
mappings.
By default, the MST region-related parameters adopt the default values, and all
VLANs in an MST region are mapped to MSTI 0.
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