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Per-VLAN Spanning Tree plus (PVST+) |
1173
Command
History
Usage
Information
The BPDU guard option prevents the port from participating in an active STP topology in case a
BPDU appears on a port unintentionally, or is misconfigured, or is subject to a DOS attack. This option
places the port into an error disable state if a BPDU appears, and a message is logged so that the
administrator can take corrective action.
If
shutdown-on-violation
is not enabled, BPDUs will still be sent to the RPM CPU.
Root guard and loop guard cannot be enabled at the same time on a 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.
When used in a PVST+ network, 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.
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.
Example
Figure 46-7. spanning-tree pvst vlan Command Example
Related
Commands
Version 8.5.1.0
Introduced the
loopguard
and
rootguard
options on the E-Series ExaScale.
Version 8.4.2.1
Introduced the
loopguard
and
rootguard
options on the E-Series TeraScale,
C-Series, and S-Series.
Version 8.2.1.0
Introduced hardware shutdown-on-violation option
Version 7.6.1.0
Support added for S-Series
Version 7.5.1.0
Support added for C-Series
Version 7.4.1.0
Added the optional Bridge Port Data Unit (BPDU) guard
Version 6.2.1.1
Introduced
Note:
A port configured as an edge port, on a PVST switch, will immediately transition to
the forwarding state. Only ports connected to end-hosts should be configured as an edge port.
Consider an edge port similar to a port with a spanning-tree portfast enabled.
FTOS(conf-if-gi-1/1)#spanning-tree pvst vlan 3 cost 18000
FTOS(conf-if-gi-1/1)#end
FTOS(conf-if-gi-1/1)#show config
!
interface GigabitEthernet 1/1
no ip address
switchport
spanning-tree pvst vlan 3 cost 18000
no shutdown
FTOS(conf-if-gi-1/1)#end
FTOS#
View PVST+ configuration
Содержание Force10 TeraScale C Series
Страница 1: ...FTOS Command Line Reference Guide FTOS 8 4 2 7 E Series TeraScale C Series S Series S50 S25 ...
Страница 164: ...164 Control and Monitoring w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 176: ...176 802 1ag w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 188: ...188 802 3ah w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 204: ...204 802 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 ...
Страница 294: ...294 Access Control Lists ACL w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 428: ...428 Border Gateway Protocol IPv4 BGPv4 w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 456: ...456 Configuration 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 ...
Страница 472: ...472 Dynamic Host Configuration Protocol DHCP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 484: ...484 Far End Failure Detection FEFD w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 682: ...682 IPv4 Routing w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 732: ...732 IPv6 Basics w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 896: ...896 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 ...
Страница 914: ...914 Link Layer Detection Protocol LLDP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 926: ...926 Multicast Listener Discovery MLD w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 952: ...952 Multiple Spanning Tree Protocol MSTP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 976: ...976 Multicast w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 984: ...984 Neighbor Discovery Protocol NDP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1094: ...1094 Policy based Routing PBR w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1130: ...1130 PIM Sparse Mode PIM SM w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1164: ...1164 Private VLAN PVLAN w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1276: ...1276 Rapid Spanning Tree Protocol RSTP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1342: ...1342 Service Provider Bridging w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1354: ...1354 sFlow w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1428: ...1428 Spanning Tree Protocol STP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1444: ...1444 Time and Network Time Protocol NTP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1464: ...1464 VLAN Stacking w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1494: ...1494 Virtual Router Redundancy Protocol VRRP w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1534: ...1534 C Series Diagnostics and Debugging w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 1574: ...1574 E 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 ...
Страница 1592: ...1592 S 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 ...
Страница 1622: ...1622 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 ...
Страница 1640: ...1640 Command 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 ...