CCNA Day 21.1- BPDU Guard
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21 Terms
Does a PortFast-enabled port send BPDUs?
Yes
What happens when a PortFast-enabled port receives a BPDU?
It will revert to acting like a regular STP port (without PortFast)
[Feature] err-disables a switch port if it receives an STP BPDU.
BPDU Guard
If a BPDU Guard-enabled port receives a BPDU, what happens to the port?
It is error-disabled (err-disabled)
Enable BPDU Guard on a port:SW1(config-if)# [...]
spanning-tree bpduguard enable
Enable BPDU Guard by default:SW1(config)# [...]
spanning-tree portfast [edge] bpduguard default
When BPDU Guard is enabled by default, which ports is it active on?
All PortFast-enabled ports
Disable BPDU Guard on a specific port (after it has been enabled by default):SW1(config-if)# [...]
spanning-tree bpduguard disable
Manually re-enable an err-disabled port:SW1(config-if)# [...]SW1(config-if)# [...]
shutdown
no shutdown
Which feature can automatically re-enable err-disabled ports?
ErrDisable Recovery
View the status of ErrDisable Recovery on the switch:SW1# [...]
show errdisable recovery
The default ErrDisable Recovery interval is [time].
300 seconds/5 minutes
Modify the ErrDisable Recovery interval:SW1(config)# [...]
errdisable recovery interval seconds
Enable ErrDisable Recovery for a particular cause:SW1(config)# [...]
errdisable recovery cause cause(e.g. errdisable recovery cause bpduguard)
[Feature] prevents a switch port from sending BPDUs.
BPDU Filter
Enable BPDU Filter on a port:SW1(config-if)# [...]
spanning-tree bpdufilter enable
Enable BPDU Filter by default:SW1(config)# [...]
spanning-tree portfast [edge] bpdufilter default
Disable BPDU Filter on a port (after it has been enabled by default):SW1(config-if)# [...]
spanning-tree bpdufilter disable
BPDU Filter has been enabled in interface config mode. What happens if the port receives a BPDU?
The port ignores the BPDU
BPDU Filter has been enabled in global config mode. What happens if the port receives a BPDU?
PortFast and BPDU Filter are disabled, and the port operates as a normal STP port
When BPDU Filter is enabled by default, which ports is it active on?
All PortFast-enabled ports