Reference Guide

ethernet1/1/23 128.348 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/24 128.352 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/25 128.356 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/26 128.360 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/27 128.364 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/28 128.368 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/29 128.372 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/30 128.376 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/31 128.380 128 200000000 BLK 0 0 0000.0000.0000 0.0
ethernet1/1/32 128.384 128 200000000 BLK 0 0 0000.0000.0000 0.0
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
-------------------------------------------------------------------------
ethernet1/1/1 Disb 128.260 128 200000000 BLK 0 AUTO No
ethernet1/1/2 Disb 128.264 128 200000000 BLK 0 AUTO No
ethernet1/1/3 Disb 128.268 128 200000000 BLK 0 AUTO No
ethernet1/1/4 Disb 128.272 128 200000000 BLK 0 AUTO No
ethernet1/1/5:1 Disb 128.276 128 200000000 BLK 0 AUTO No
Global parameters
The root bridge sets the values for forward-time, hello-time, and max-age, and overwrites the values set on other bridges participating in
the RSTP group. Dell EMC recommends that only experienced network administrators change the RSTP group parameters. Poorly planned
modication of the RSTP parameters can negatively aect network performance.
Forward-time 15 seconds — Amount of time an interface waits in the Listening state and the Learning state before it transitions
to the Forwarding state.
Hello-time 2 seconds — Time interval in which the bridge sends RSTP BPDUs.
Max-age 20 seconds — Length of time the bridge maintains conguration information before it refreshes that information
by recomputing the RSTP topology.
Port cost Port cost values to set the path cost of the interface:
• 100-Mb/s Ethernet interfaces — 200000
• 1-Gigabit Ethernet interfaces — 20000
• 10-Gigabit Ethernet interfaces — 2000
• 40-Gigabit Ethernet interfaces — 500
• Port-channel with 100 Mb/s Ethernet interfaces — 200000
• Port-channel with 1-Gigabit Ethernet interfaces — 20000
• Port-channel with 10-Gigabit Ethernet interfaces — 2000
• Port-channel with 1x40Gigabit Ethernet interface — 500
• Port-channel with 2x40Gigabit Ethernet interfaces — 250
• Change the forward-time in CONFIGURATION mode (4 to 30, default 15).
spanning-tree rstp forward-time seconds
• Change the hello-time in CONFIGURATION mode (1 to 10, default 2). With large congurations (especially those congurations with
more ports) Dell EMC recommends increasing the hello-time.
spanning-tree rstp hello-time seconds
• Change the max-age in CONFIGURATION mode (6 to 40, default 20).
spanning-tree rstp max-age seconds
View current interface parameters
OS10# show spanning-tree active
Spanning tree enabled protocol rstp with force-version rstp
Executing IEEE compatible Spanning Tree Protocol
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Layer 2