Users Guide

Current root has priority 32768, Address 0001.e801.6aa8
Number of topology changes 1, last change occurred 00:00:31 ago on Tf 1/1
Port 257 (twentyFiveGigE 1/1) 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
Example (Guard)
DellEMC# show spanning-tree rstp guard
Interface
Name Instance Sts Guard type
--------- -------- -------------------
Tf 1/1 0 INCON(Root) Rootguard
Tf 1/2 0 FWD Loopguard
Tf 1/3 0 BLK Bpduguard
spanning-tree rstp
Configure an RSTP interface with one of these settings: port cost, edge port with optional bridge port data unit (BPDU) guard,
port priority, loop guard, or root guard.
Syntax
spanning-tree rstp {cost port-cost | edge-port [bpduguard [shutdown-on-
violation]] | priority priority | {loopguard | rootguard}}
Parameters
cost port-cost Enter the keyword cost then the port cost value. The range is from 1 to 200000.
The defaults are:
● 100 Mb/s Ethernet interface = 200000
● 1-Gigabit Ethernet interface = 20000
● 10-Gigabit Ethernet interface = 2000
● Port Channel interface with one 100 Mb/s Ethernet = 200000
● Port Channel interface with one 1 Gigabit Ethernet = 20000
● Port Channel interface with one 10 Gigabit Ethernet = 2000
● Port Channel with two 1 Gigabit Ethernet = 18000
● Port Channel with two 10 Gigabit Ethernet = 1800
● Port Channel with two 100 Mbps Ethernet = 180000
edge-port Enter the keywords edge-port to configure the interface as a rapid spanning tree
edge port.
bpduguard
(OPTIONAL) Enter the keyword portfast to enable Portfast to move the
interface into Forwarding mode immediately after the root fails.
Enter the keyword bpduguard to disable the port when it receives a BPDU.
shutdown-on-
violation
(OPTIONAL) Enter the keywords shutdown-on-violation to hardware disable
an interface when a BPDU is received and the port is disabled.
priority priority Enter keyword priority then a value in increments of 16 as the priority. The
range is from 0 to 240. The default is 128.
loopguard Enter the keyword loopguard to enable loop guard on an RSTP port or port-
channel interface.
rootguard Enter the keyword rootguard to enable root guard on an RSTP port or port-
channel interface.
Defaults Not configured.
Command Modes INTERFACE
Rapid Spanning Tree Protocol (RSTP) 1341