cnp3-ebook/principles/network — English @ Weblate

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90 ../../principles/network.rst:457 • ../../principles/network.rst:499 • ../../principles/network.rst:511 • ../../principles/network.rst:523 • ../../principles/network.rst:535

	English label 5/10000 · 5
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	English 0 1/10000 · 1
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	English South 5/10000 · 5
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	English 7 1/10000 · 1
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	English 1 1/10000 · 1
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	English none 4/10000 · 4
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	English 2 1/10000 · 1
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	English West 4/10000 · 4
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	English 3 1/10000 · 1
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	English East 4/10000 · 4
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	English If this node receives a packet with `label=2`, it forwards the packet on its `West` interface and sets the `label` of the outgoing packet to `2`. If the received packet's `label` is set to `3`, then the packet is forwarded over the `East` interface and the `label` of the outgoing packet is set to `2`. If a packet is received with a label field set to `1`, the packet is discarded since the corresponding `label forwarding table` entry is invalid. 448/10000 · 448
101 ../../principles/network.rst:470

	English `Label switching` enables a full control over the path followed by packets inside the network. Consider the network below and assume that we want to use two virtual circuits : `R1->R3->R4->R2->R5` and `R2->R1->R3->R4->R5`. 222/10000 · 222
102 ../../principles/network.rst:494

	English To create these virtual circuits, we need to configure the `label forwarding tables` of all routers. For simplicity, assume that a label forwarding table only contains two entries. Assume that `R5` wants to receive the packets from the virtual circuit created by `R1` (resp. `R2`) with `label=1` (`label=0`). `R4` could use the following `label forwarding table`: 363/10000 · 363
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	English R4's label forwarding table 27/10000 · 27
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	English ->R2 4/10000 · 4
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	English ->R5 4/10000 · 4
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	English Since a packet received with `label=1` must be forwarded to `R5` with `label=1`, `R2`'s `label forwarding table` could contain : 128/10000 · 128
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	English R2's label forwarding table 27/10000 · 27
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	English Two virtual circuits pass through `R3`. They both need to be forwarded to `R4`, but `R4` expects `label=1` for packets belonging to the virtual circuit originated by `R2` and `label=0` for packets belonging to the other virtual circuit. `R3` could choose to leave the labels unchanged. 285/10000 · 285
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	English R3's label forwarding table 27/10000 · 27

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