Displaying Port Rapid-Spanning-Tree Topology Settings - Nokia ESB26 User Manual

13.
rapid-spanning-tree detect-protocols
The rapid-spanning-tree detect-protocols command, in Interface Configuration mode,
forces the port to work by the Rapid Spanning Tree Protocol (RSTP) and not by the Spanning
Tree Protocol (STP).
A switch running RSTP supports a built-in protocol migration mechanism that enables RSTP
to interoperate with legacy 802.1D STP.
When an RSTP switch receives a legacy 802.1D configuration BPDU (BPDU with protocol
version 0) it start transmitting legacy 802.1D BPDU (configuration messages and TCN
messages), however, when the switch stops receiving BPDU it cannot automatically revert to
the RSTP mode because the switch cannot determine whether the legacy switch has been
removed from that link unless the legacy switch is a designated switch
The RSTP supports a mechanism that forces the port to restart protocol migration process
(force the renegotiation with neighboring switches) by mean of:
1. CLI command rapid-spanning-tree detect-protocols.
2. A link up event.
Command Syntax
device-name(config-if 1/1/1)#rapid-spanning-tree detect-protocols
Displaying Port Rapid-Spanning-Tree Topology
Settings
Table 13-6 RSTP Display Commands in View / Privileged Mode
C o m m a n d
show rapid-spanning-tree
show rapid-spanning-tree interface
show rapid-spanning-tree
The show rapid-spanning-tree command, in Privileged (Enable) mode, displays the current
RSTP parameter settings and Rapid-Spanning-Tree topology for all ports.
Command Syntax
device-name#show rapid-spanning-tree
MN700004 Rev 01
Rapid Spanning Tree Protocol (RSTP)
D e s c r i p t i o n
Displays the current RSTP parameter settings, and Rapid-
Spanning-Tree topology of all ports.
Displays the Rapid-Spanning-Tree topology for the specified
port.
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