Command Line Interface
798 1553-KDU 137 365 Uen D 2006-06-16
network loops, thus isolating group members. When operating
multiple VLANs, it is recommended to select the MSTP option.
• Rapid Spanning Tree Protocol
RSTP supports connections to either STP or RSTP nodes by
monitoring the incoming protocol messages and dynamically adjusting
the type of protocol messages the RSTP node transmits, as described
below:
• STP Mode – If the ECN330-switch receives an 802.1D BPDU after
a port’s migration delay timer expires, the ECN330-switch assumes
it is connected to an 802.1D bridge and starts using only 802.1D
BPDUs.
• RSTP Mode – If RSTP is using 802.1D BPDUs on a port and
receives an RSTP BPDU after the migration delay expires, RSTP
restarts the migration delay timer and begins using RSTP BPDUs
on that port.
• Multiple Spanning Tree Protocol
• To allow multiple spanning trees to operate over the network, a
related set of bridges with the same MSTP configuration must be
configured, allowing them to participate in a specific set of spanning
tree instances.
• A spanning tree instance can exist only on bridges that have
compatible VLAN instance assignments.
• Be careful when switching between spanning tree modes.
Changing modes stops all spanning-tree instances for the previous
mode and restarts the system in the new mode, temporarily
disrupting user traffic.
Example
The following example configures the ECN330-switch to use the Rapid
Spanning Tree Protocol.
Console(config)#spanning-tree mode rstp
Console(config)#
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