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Spanning Tree Protocol |
1067
Loop Guard Configuration
You enable STP loop guard on a per-port or per-port channel basis.
To enable a loop guard on an STP-enabled port or port-channel interface, enter the
spanning-tree 0
loopguard
command:
To disable STP loop guard on a port or port-channel interface, enter the
no spanning-tree 0
loopguard
command in an INTERFACE configuration mode.
To verify the STP loop guard configuration on a port or port-channel interface, enter the
show
spanning-tree 0 guard
[
interface
interface
]
command in global configuration mode.
FTOS Behavior:
The following conditions apply to a port enabled with loop guard:
•
Loop guard is supported on any STP-enabled port or port-channel interface.
•
Loop guard is supported on a port or port-channel in any Spanning Tree mode:
•
Spanning Tree Protocol
(STP)
•
Rapid Spanning Tree Protocol
(RSTP)
•
Multiple Spanning Tree Protocol
(MSTP)
•
Per-VLAN Spanning Tree Plus
(PVST+)
•
Root guard and loop guard cannot be enabled at the same time on an STP port. For example, if you
configure loop guard on a port on which root guard is already configured, the following error message is
displayed:
% Error: RootGuard is configured. Cannot configure LoopGuard.
•
C-Series and E-Series only
: Loop guard is supported on a C-Series or E-Series switch configured for
hitless STP (see
Configuring Spanning Trees as Hitless on page 1064
).
•
Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that remains in a
blocking state and prevents traffic from flowing through it. For example, when Portfast BPDU guard and
loop guard are both configured:
- If a BPDU is received from a remote device, BPDU guard places the port in an err-disabled
blocking state and no traffic is forwarded on the port.
- If no BPDU is received from a remote device, loop guard places the port in a loop-inconsistent
blocking state and no traffic is forwarded on the port.
•
When used in a PVST+ network, STP loop guard is performed per-port or per-port channel at a VLAN
level. If no BPDUs are received on a VLAN interface, the port or port-channel transitions to a
loop-inconsistent (blocking) state only for this VLAN.
Task
Command Syntax
Command Mode
Enable loop guard on a port or port-channel interface.
0
:
Enables loop guard on an STP-enabled port assigned to
instance 0.
mstp
:
Enables loop guard on an MSTP-enabled port.
rstp
:
Enables loop guard on an RSTP-enabled port.
pvst
:
Enables loop guard on a PVST-enabled port.
spanning-tree
{
0
|
mstp
|
rstp
|
pvst
}
loopguard
INTERFACE
INTERFACE
PORT-CHANNEL
Summary of Contents for Force10 E300
Page 1: ...FTOS Configuration Guide FTOS 8 4 2 7 E Series TeraScale C Series S Series S50 S25 ...
Page 32: ...32 w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 132: ...132 802 1X w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 310: ...310 Configuration Replace and Rollback w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 330: ...330 Dynamic Host Configuration Protocol w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 402: ...402 High Availability w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 462: ...462 Interfaces w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 482: ...482 IPv4 Addressing w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 506: ...506 IPv6 Addressing w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 582: ...582 Layer 2 w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 642: ...642 Multicast Source Discovery Protocol w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 662: ...662 Multiple Spanning Tree Protocol w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 690: ...690 Object Tracking w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 754: ...754 PIM Dense Mode w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 784: ...784 PIM Source Specific Mode w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 800: ...800 Power over Ethernet w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 876: ...876 Quality of Service w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 892: ...892 Routing Information Protocol w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1006: ...1006 Simple Network Management Protocol w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1018: ...1018 SONET SDH w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1048: ...1048 Broadcast Storm Control w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1096: ...1096 Uplink Failure Detection UFD w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1098: ...1098 Upgrade Procedures w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1196: ...1196 C Series Debugging and Diagnostics w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1252: ...1252 Standards Compliance w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1262: ...1262 Index w w w d e l l c o m s u p p o r t d e l l c o m ...