Spanning-Tree Pvst Err-Disable - Dell Force10 S4810P Reference Manual

Ftos command line reference guide for the s4810 system ftos 9.1.(0.0)

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If you do not enable shutdown-on-violation, BPDUs are still sent to the route process

module (RPM) CPU.

You cannot enable root guard and loop guard 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:

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

FTOS(conf-if-gi-1/1)#end

show spanning-tree pvst

spanning-tree pvst err-disable

Place ports in an Err-Disabled state if they receive a PVST+ BPDU when they are members an untagged VLAN.

C-Series, E-Series, S-Series, Z-Series, S4810

spanning-tree pvst err-disable cause invalid-pvst-bpdu

Enabled; ports are placed in the Err-Disabled state if they receive a PVST+ BPDU when they

are members of an untagged VLAN.

Command Modes

NOTE: A port configured as an edge port, on a PVST switch, immediately transitions 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.

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.

no ip address

spanning-tree pvst vlan 3 cost 18000

– views the PVST+ configuration.