Dell Force10 MXL Blade - Add and Remove Interfaces; Modify Global Parameters

466 | Rapid Spanning Tree Protocol (RSTP)
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To confirm that a port is participating in RST, use the show spanning-tree rstp brief command from EXEC
privilege mode (Figure 27-6).
Figure 27-6. show spanning-tree rstp brief Command Example
Add and Remove Interfaces
• To add an interface to the RST 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
spanning-tree 0 command.
• To remove an interface from the RST topology, use the
no spanning-tree 0 command. For bridge
protocol data units (BPDU) filtering behavior, refer to Removing an Interface from the Spanning Tree
Group.
Modify Global Parameters
You can modify the RST 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 RST 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).
FTOS#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
Bpdu filter disabled globally
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
---------- -------- ---- ------- --- ------------------------------ -----
TenGig 3/1 128.681 128 20000 BLK 20000 32768 0001.e80b.88bd 128.469
TenGig 3/2 128.682 128 20000 BLK 20000 32768 0001.e80b.88bd 128.470
TenGig 3/3 128.683 128 20000 FWD 20000 32768 0001.e801.cbb4 128.379
TenGig 3/4 128.684 128 20000 BLK 20000 32768 0001.e801.cbb4 128.380
Interface Bpdu
Name Role PortID Prio Cost Sts Cost Link-type Edge Filter
---------- ----- -------- ---- ------- --- ------- --------- ------- --------
TenGig 3/1 Altr 128.681 128 20000 BLK 20000 P2P No No
TenGig 3/2 Altr 128.682 128 20000 BLK 20000 P2P No No
TenGig 3/3 Root 128.683 128 20000 FWD 20000 P2P No No
TenGig 3/4 Altr 128.684 128 20000 BLK 20000 P2P No No
FTOS#