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904 | Rapid Spanning Tree Protocol
www.dell.com | support.dell.com
Figure 44-6. show spanning-tree rstp brief Command Example
Add and Remove Interfaces
• 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
, re-enable it using the command spanning-tree 0.
• Remove an interface from the Rapid Spanning Tree topology using the command
no spanning-tree 0.
See also Removing an Interface from the Spanning Tree Group on page 1054 for BPDU Filtering
behavior.
Modify Global Parameters
You can modify Rapid Spanning Tree 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 is the amount of time an interface waits in the Listening State and the Learning State
before it transitions to the Forwarding State.
• Hello-time is the time interval in which the bridge sends RSTP Bridge Protocol Data Units (BPDUs).
• Max-age is the length of time the bridge maintains configuration information before it refreshes that
information by recomputing the RST topology.
Note: Dell Force10 recommends that only experienced network administrators change the Rapid Spanning
Tree group parameters. Poorly planned modification of the RSTG parameters can negatively impact
network performance.
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 Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
---------- -------- ---- ------- --- ------- -------------------- --------
Gi 3/1 128.681 128 20000 BLK 20000 32768 0001.e80b.88bd 128.469
Gi 3/2 128.682 128 20000 BLK 20000 32768 0001.e80b.88bd 128.470
Gi 3/3 128.683 128 20000 FWD 20000 32768 0001.e801.cbb4 128.379
Gi 3/4 128.684 128 20000 BLK 20000 32768 0001.e801.cbb4 128.380
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
---------- ------ -------- ---- ------- --- ------- --------- ----
Gi 3/1 Altr 128.681 128 20000 BLK 20000 P2P No
Gi 3/2 Altr 128.682 128 20000 BLK 20000 P2P No
Gi 3/3 Root 128.683 128 20000 FWD 20000 P2P No
Gi 3/4 Altr 128.684 128 20000 BLK 20000 P2P No
R3#