Dell Force10 C150 Configuration Manual page 1058

Figure 52-8
Dell Force10 system is configured with Portfast. If the switch is connected to the hub, the BPDUs that the
switch generates might trigger an undesirable topology change. If BPDU Guard is enabled, when the edge
port receives the BPDU, the BPDU will be dropped, the port will be blocked, and a console message will
be generated.
Message 1 BPDU Guard Error
3w3d0h: %RPM0-P:RP2 %SPANMGR-5-BPDU_GUARD_RX_ERROR: Received Spanning Tree BPDU on BPDU guard
port. Disable GigabitEthernet 3/41.
Note: Note that unless the
after a BPDU violation; the physical interface remains up, as shown below.
FTOS(conf-if-gi-0/7)#do show spanning-tree rstp brief
Executing IEEE compatible Spanning Tree Protocol
Root ID
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID
Configured hello time 2, max age 20, forward delay 15
Interface
Name
---------- -------- ---- ------- --- ------- -------------------- --------
Gi 0/6
Gi 0/7
Interface
Name
---------- ------ -------- ---- ------- --- ------- --------- ----
Gi 0/6
Gi 0/7
FTOS(conf-if-gi-0/7)#do show ip int br gi 0/7
Interface
GigabitEthernet 0/7
FTOS Behavior: Regarding
1 If the interface to be shutdown is a port channel then all the member ports are disabled in the hardware.
2 When a physical port is added to a port channel already in error disable state, the new member port will
3
4
1058 | Spanning Tree Protocol
shows a scenario in which an edgeport might unintentionally receive a BPDU. The port on the
shutdown-on-violation
Priority 32768, Address 0001.e805.fb07
Priority 32768, Address 0001.e85d.0e90
PortID Prio Cost
128.263 128 20000
128.264 128 20000
Role PortID Prio Cost
Root 128.263 128
ErrDis 128.264 128
IP-Address
unassigned
bpduguard shutdown-on-violation
also be disabled in the hardware.
When a physical port is removed from a port channel in error disable state, the error disabled state is
cleared on this physical port (the physical port will be enabled in the hardware).
reset linecard
The command does not clear the error disabled state of the port or the hardware disabled
state. The interface continues to be disables in the hardware.
The error disabled state can be cleared with any of the following methods:
shutdown
•Perform an command on the interface.
shutdown-on-violation
•Disable the
bpduguard | shutdown-on-violation
[ [
•Disable spanning tree on the interface (
•Disabling global spanning tree (
option is enabled, spanning-tree only drops packets
Designated
Sts Cost Bridge ID
FWD 20000 32768 0001.e805.fb07 128.653
EDS 20000 32768 0001.e85d.0e90 128.264
Sts Cost Link-type Edge
20000 FWD 20000 P2P
20000 EDS 20000 P2P
OK Method Status
YES Manual up
command on the interface (
]] ).
no spanning-tree
no spanning-tree
in CONFIGURATION mode).
PortID
No
No
Protocol
up
behavior:
no spanning-tree stp-id portfast
in INTERFACE mode).