•
Assign a number as the bridge priority or designate it as the primary or secondary root.
PROTOCOL SPANNING TREE RSTP mode
bridge-priority
priority-value
•
priority-value
The range is from 0 to 65535. The lower the number assigned, the more likely this bridge becomes the root
bridge.
The default is
32768
. Entries must be multiples of 4096.
Example of the bridge-priority Command
A console message appears when a new root bridge has been assigned. The following example example shows the console message after
the
bridge-priority
command is used to make R2 the root bridge (shown in bold).
Dell(conf-rstp)#bridge-priority 4096
04:27:59: %RPM0-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: RSTP root changed. My Bridge ID:
4096:0001.e80b.88bd
Old Root: 32768:0001.e801.cbb4 New Root: 4096:0001.e80b.88bd
Configuring an EdgePort
The EdgePort feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner.
In this mode an interface forwards frames by default until it receives a BPDU that indicates that it should behave otherwise; it does not go
through the Learning and Listening states. The
bpduguard shutdown-on-violation
option causes the interface hardware to be
shut down when it receives a BPDU. When only
bpduguard
is implemented, although the interface is placed in an Error Disabled state
when receiving the BPDU, the physical interface remains up and spanning-tree drops packets in the hardware after a BPDU violation.
BPDUs are dropped in the software after receiving the BPDU violation. This feature is the same as PortFast mode in Spanning Tree.
CAUTION:
Configure EdgePort only on links connecting to an end station. If you enable EdgePort on an interface connected to a
network, it can cause loops.
Dell Networking OS Behavior
: Regarding
bpduguard shutdown-on-violation
behavior:
•
If the interface to be shut down is a port channel, all the member ports are disabled in the hardware.
•
When you add a physical port to a port channel already in the Error Disable state, the new member port is also disabled in the hardware.
•
When you remove a physical port from a port channel in the Error Disable state, the error disabled state is cleared on this physical port
(the physical port is enabled in the hardware).
•
You can clear the Error Disabled state with any of the following methods:
•
Perform an
shutdown
command on the interface.
•
Disable the
shutdown-on-violation
command on the interface (the
no spanning-tree stp-id portfast
[bpduguard | [shutdown-on-violation]]
command).
•
Disable spanning tree on the interface (the
no spanning-tree
command in INTERFACE mode).
•
Disable global spanning tree (the
no spanning-tree
command in CONFIGURATION mode).
To enable EdgePort on an interface, use the following command.
•
Enable EdgePort on an interface.
INTERFACE mode
spanning-tree rstp edge-port [bpduguard | shutdown-on-violation]
Example of Verifying an EdgePort is Enabled on an Interface
To verify that EdgePort is enabled on a port, use the
show spanning-tree rstp
command from EXEC privilege mode or the
show
config
command from INTERFACE mode.
NOTE:
Dell Networking recommends using the
show config
command from INTERFACE mode.
In the following example, the bold line indicates that the interface is in EdgePort mode.
Dell(conf-if-te-2/1)#show config
!
Rapid Spanning Tree Protocol (RSTP)
789
Summary of Contents for S4048T-ON
Page 1: ...Dell Configuration Guide for the S4048 ON System 9 11 2 1 ...
Page 148: ...Figure 10 BFD Three Way Handshake State Changes 148 Bidirectional Forwarding Detection BFD ...
Page 251: ...Dell Control Plane Policing CoPP 251 ...
Page 363: ... RPM Synchronization GARP VLAN Registration Protocol GVRP 363 ...
Page 511: ...Figure 64 Inspecting the LAG Configuration Link Aggregation Control Protocol LACP 511 ...
Page 558: ...Figure 84 Configuring Interfaces for MSDP 558 Multicast Source Discovery Protocol MSDP ...
Page 559: ...Figure 85 Configuring OSPF and BGP for MSDP Multicast Source Discovery Protocol MSDP 559 ...
Page 564: ...Figure 88 MSDP Default Peer Scenario 2 564 Multicast Source Discovery Protocol MSDP ...
Page 565: ...Figure 89 MSDP Default Peer Scenario 3 Multicast Source Discovery Protocol MSDP 565 ...
Page 841: ...Figure 115 Single and Double Tag TPID Match Service Provider Bridging 841 ...
Page 842: ...Figure 116 Single and Double Tag First byte TPID Match 842 Service Provider Bridging ...