Advanced STP Tuning - Additional STP Protection Mechanisms
12 important questions on Advanced STP Tuning - Additional STP Protection Mechanisms
Name 4 common scenarios causing Layer 2 Forwarding loops.
2. Misconfigured Load Balancer sending traffic out multiple interfaces with the same MAC address
3. A misconfigured Virtual Switch that bridges to physical ports.
4. End users using a dumb network switch or hub.
Root Guard puts a port in an ErrDisabled state when a superior BPDU is received on it.
What is Root Guard used for? And what does it prevent by putting the port in an ErrDisabled state
2. It prevents a downstream switch of becoming the Root Bridge.
What are the two main features of STP Portfast
2. It bypasses the 802.1D states of listening and learning and starts forwarding right away.
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BPDU Guard shuts ports down configured with STP Portfast when a BPDU is received on it. As Portfast already disables Portfast on the port in this case, what value does this add?
On which interfaces is BPDU Guard typically configured?
A BPDU Guard ErrDisabled port is not automatically restored. The Error Recovery Service can be used to do this, reducing administrative overhead. How is this configured? And how long does it ERS take to restore the port.
2. By default ERS runs every 300 seconds. Can be changed to 5 to 86400 seconds.
BPDU Filter prevents ports from sending out BPDUs. What is the difference between the Global and Interface configuration commands
STP Loop Guard prevents Alt or Root ports from becoming Designated Ports when?
Unidirectional Link Detection is used for?
How does UDLD monitoring work?
It needs to be enabled on both switches.
What are the 2 UDLD modes?
2. Aggressive (If a frame is not acknowledged, another 8 packets in 1 second intervals are send. If those are not acknowledged the port is placed in an error state.
What is the difference between Root Guard and BPDU Guard?
Root Guard is meant to be used on designated ports towards non-root switches to prevent them becoming Root ports. It blocks the port only when superior BPDU's are received and automatically recovers when this stops.
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