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16 Cards in this Set
- Front
- Back
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What is the purpose of LoopGuard?
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Guards against layer 2 loop caused by some kind of failure (hardware/software)
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What are some issues that could cause BPDUs to not be heard by a switch?
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Processing issue
Duplex mismatch Unidirectional link failure |
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What state does a LoopGuard port go into if there is a problem?
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loop-inconsistent
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How does a port recover from loop-inconsistent state?
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Manual intervention
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What does UDLD stand for?
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Unidirectional Link Detection
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What is the purpose of Unidirectional Link Detection (UDLD)
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Originally developed for fiber links, it detects wiring faults that could cause unidirectional traffic.
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What does BPDUGuard do?
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Moves a port to errdisabled state if a BPDU is heard on it
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Where is BPDUGuard configured?
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On edge ports like Portfast
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What is the purpose of BPDUGuard?
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Enforces STP domain borders to keep the active topology predictable.
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What is the purpose of RootGuard?
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Prevents the wrong device from becoming the root bridge.
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What does RootGuard do on a port where it is enabled?
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If the port receives a 'superior' BPDU, RootGuard moves it to a 'root-inconsistent' state
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What does BPDUFilter do?
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Prevents BPDUs from being sent on a port and ignores BPDUs received.
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What are the implications of BPDUFilter?
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Dangerous command as it could create bridging loops if used incorrectly. Not recommended.
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What is the purpose of Storm Control?
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To protect the network against a broadcast storm.
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How does Storm Control work?
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Monitors traffic types in 1 second intervals. If a defined threshold is hit, all incoming traffic is dropped on that port.
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Where does Storm Control operate?
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Most platforms support in software, some can run it in hardware.
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