Adding And Removing Interfaces; Modifying Global Parameters - Dell S6100 Configuration Manual

Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.379, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 121, received 5
The port is not in the Edge port mode
Port 380 (TenGigabitEthernet 1/1/5/1) is designated Forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.380
Designated root has priority 32768, address 0001.e801.cbb4
Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.380, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 147, received 3
The port is not in the Edge port mode
To confirm that a port is participating in RSTP, use the show spanning-tree rstp brief command from EXEC privilege mode.
R3#show spanning-tree rstp brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 0001.e801.cbb4
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 0001.e80f.1dad
Configured hello time 2, max age 20, forward delay 15
Interface
Name PortID Prio Cost
------------ -------- ----
Te 1/1/1/1 128.681 128
Te 1/1/1/2 128.682 128
Te 1/1/1/3 128.683 128
Te 1/1/1/4 128.684 128
Interface
Name Role PortID
--------- --- ------ -------- ---- ------- --- -----------
Te 1/1/2/1 Altr 128.681 128 20000
Te 1/1/2/2 Altr 128.682 128 20000
Te 1/1/2/3 Root 128.683 128 20000
Te 1/1/2/4 Altr 128.684 128 20000
R3#

Adding and Removing Interfaces

To add and remove interfaces, use the following commands.
To add an interface to the Rapid Spanning Tree topology, configure it for Layer 2 and it is automatically added. If you previously disabled
RSTP on the interface using the command no spanning-tree 0 command, re-enable it using the spanning-tree 0 command.
• Remove an interface from the Rapid Spanning Tree topology.
no spanning-tree 0

Modifying Global Parameters

You can modify RSTP parameters.
The root bridge sets the values for forward-delay, hello-time, and max-age and overwrites the values set on other bridges participating in
the Rapid Spanning Tree group.
• Forward-delay — the amount of time an interface waits in the Listening state and the Learning state before it transitions to the
Forwarding state.
• Hello-time — the time interval in which the bridge sends RSTP BPDUs.
• Max-age — the length of time the bridge maintains configuration information before it refreshes that information by recomputing the
RST topology.
NOTE: Dell Networking recommends that only experienced network administrators change the Rapid Spanning Tree group
parameters. Poorly planned modification of the RSTP parameters can negatively affect network performance.
748 Rapid Spanning Tree Protocol (RSTP)
Designated
Sts Cost Bridge ID
------- --- ------- ------------- --------
20000 BLK 20000 32768 0001.e80b.88bd
20000 BLK 20000 32768 0001.e80b.88bd
20000 FWD 20000 32768 0001.e801.cbb4
20000 BLK 20000 32768 0001.e801.cbb4
Prio Cost Sts Cost
BLK 20000
BLK 20000
FWD 20000
BLK 20000
PortID
128.469
128.470
128.379
128.380
Link-type Edge
P2P No
P2P No
P2P No
P2P No