S
PANNING
T
REE
A
LGORITHM
C
ONFIGURATION
3-129
CLI – This command displays global STA settings, followed by settings
for each port.
Note: The current root port and current root cost display as zero when
this device is not connected to the network.
Configuring Global Settings
Global settings apply to the entire switch.
Command Usage
• Spanning Tree Protocol
10
Uses RSTP for the internal state machine, but sends only 802.1D
BPDUs.
• Rapid Spanning Tree Protocol
10
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:
Console#show spanning-tree 4-195
Spanning-tree information
---------------------------------------------------------------
Spanning tree mode :RSTP
Spanning tree enable/disable :enabled
Priority :32768
Bridge Hello Time (sec.) :2
Bridge Max Age (sec.) :20
Bridge Forward Delay (sec.) :15
Root Hello Time (sec.) :2
Root Max Age (sec.) :20
Root Forward Delay (sec.) :15
Designated Root :32768.0.0000ABCD0000
Current root port :1
Current root cost :200000
Number of topology changes :1
Last topology changes time (sec.):13380
Transmission limit :3
Path Cost Method :long
.
.
.
10. STP and RSTP BPDUs are transmitted as untagged frames, and will cross any VLAN boundaries.
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