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A switching loop or bridge loop occurs in computer networks when there is more than one layer 2 path between two endpoints (e.g. multiple connections between two network switches or two ports on the same switch connected to each other). The loop creates broadcast storms as broadcasts and multicasts are forwarded by switches out every port, the switch or switches will repeatedly rebroadcast the broadcast messages flooding the network. Since the layer-2 header does not include a time to live (TTL) field, if a frame is sent into a looped topology, it can loop forever.

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  • Switching-Loop (de)
  • Switching loop (en)
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  • Als Switching-Loop oder Bridging-Loop bezeichnet man eine gefährliche Situation in geswitchten Computernetzwerken (oder in Verbindung mit mehreren Bridges), die in den meisten Situationen zu einem vollständigen Stillstand des Netzwerks durch Überlastung führt. Bei einem Switching-Loop sind zwei Netzwerkbuchsen ein und desselben Switches direkt miteinander verbunden oder es existieren zwei oder mehr aktive Verbindungen zwischen zwei Switches. Ein Switching-Loop führt auf mehrere Arten zu einer völligen Überlastung des Netzwerks durch dauernde Duplizierung von Paketen. (de)
  • A switching loop or bridge loop occurs in computer networks when there is more than one layer 2 path between two endpoints (e.g. multiple connections between two network switches or two ports on the same switch connected to each other). The loop creates broadcast storms as broadcasts and multicasts are forwarded by switches out every port, the switch or switches will repeatedly rebroadcast the broadcast messages flooding the network. Since the layer-2 header does not include a time to live (TTL) field, if a frame is sent into a looped topology, it can loop forever. (en)
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  • Als Switching-Loop oder Bridging-Loop bezeichnet man eine gefährliche Situation in geswitchten Computernetzwerken (oder in Verbindung mit mehreren Bridges), die in den meisten Situationen zu einem vollständigen Stillstand des Netzwerks durch Überlastung führt. Bei einem Switching-Loop sind zwei Netzwerkbuchsen ein und desselben Switches direkt miteinander verbunden oder es existieren zwei oder mehr aktive Verbindungen zwischen zwei Switches. Ein Switching-Loop führt auf mehrere Arten zu einer völligen Überlastung des Netzwerks durch dauernde Duplizierung von Paketen. (de)
  • A switching loop or bridge loop occurs in computer networks when there is more than one layer 2 path between two endpoints (e.g. multiple connections between two network switches or two ports on the same switch connected to each other). The loop creates broadcast storms as broadcasts and multicasts are forwarded by switches out every port, the switch or switches will repeatedly rebroadcast the broadcast messages flooding the network. Since the layer-2 header does not include a time to live (TTL) field, if a frame is sent into a looped topology, it can loop forever. A physical topology that contains switching or bridge loops is attractive for redundancy reasons, yet a switched network must not have loops. The solution is to allow physical loops, but create a loop-free logical topology using link aggregation, shortest path bridging, spanning tree protocol or TRILL on the network switches. (en)
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