Add And Remove Interfaces; Modify Global Parameters - Dell Force10 S4810P Configuration Manual

Figure 42-6. show spanning-tree rstp brief Command Example
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
---------- -------- ---- ------- --- ------- -------------------- --------
Gi 3/1 128.681
Gi 3/2 128.682
Gi 3/3 128.683
Gi 3/4 128.684
Interface
Name Role
---------- ------ -------- ---- ------- --- ------- --------- ----
Gi 3/1 Altr
Gi 3/2 Altr
Gi 3/3 Root
Gi 3/4 Altr
R3#

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
spanning-tree 0
• Remove an interface from the Rapid Spanning Tree topology using the command
See also Removing an Interface from the Spanning Tree Group on page 1008
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.
Prio Cost Sts Cost
128 20000 BLK 20000
128 20000 BLK 20000
128 20000 FWD 20000
128 20000 BLK 20000
PortID Prio Cost
128.681 128 20000
128.682 128 20000
128.683 128 20000
128.684 128 20000
, re-enable it using the command
Designated
Bridge ID
32768 0001.e80b.88bd 128.469
32768 0001.e80b.88bd 128.470
32768 0001.e801.cbb4 128.379
32768 0001.e801.cbb4 128.380
Sts Cost Link-type Edge
BLK 20000 P2P
BLK 20000 P2P
FWD 20000 P2P
BLK 20000 P2P
.
spanning-tree 0
PortID
No
No
No
No
no spanning-tree 0
for BPDU Filtering
Rapid Spanning Tree Protocol (RSTP) | 871
no
.