Reference Guide

1020 | Rapid Spanning Tree Protocol (RSTP)
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Example 2
Figure 36-5. show spanning-tree rstp with EDS and LBK
spanning-tree rstp
c e s z
Configure Port cost, Edge port with optional Bridge Port Data Unit (BPDU) guard, or Port priority on
the RSTP.
Syntax
spanning-tree rstp {cost Port cost | edge-port [bpduguard [shutdown-on-violation]] |
priority priority}
To remove the port cost, edge port with optional BPDU, or port priority, use the no spanning-tree
rstp {cost Port cost | edge-port [bpduguard] | priority priority} command.
FTOS#show spanning-tree rstp br
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 0001.e801.6aa8
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 0001.e801.6aa8
We are the root
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
---------- -------- ---- ------- --- ------- -------------------- --------
Gi 0/0 128.257 128 20000 EDS 0 32768 0001.e801.6aa8 128.257
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
---------- ------ -------- ---- ------- --- ------- --------- ----
Gi 0/0 ErrDis 128.257 128 20000 EDS 0 P2P No
FTOS#show spanning-tree rstp
Root Identifier has priority 32768, Address 0001.e801.6aa8
Root Bridge hello time 2, max age 20, forward delay 15, max hops 0
Bridge Identifier has priority 32768, Address 0001.e801.6aa8
Configured hello time 2, max age 20, forward delay 15, max hops 0
We are the root
Current root has priority 32768, Address 0001.e801.6aa8
Number of topology changes 1, last change occurred 00:00:31 ago on Gi 0/0
Port 257 (GigabitEthernet 0/0) is LBK_INC Discarding
Port path cost 20000, Port priority 128, Port Identifier 128.257
Designated root has priority 32768, address 0001.e801.6aa8
Designated bridge has priority 32768, address 0001.e801.6aa8
Designated port id is 128.257, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 27, received 9
The port is not in the Edge port mode
FTOS#
LBK_INC means
Loopback BPDU
Inconsistency