cnp3-ebook/principles/network — English @ Weblate

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93 ../../principles/network.rst:459

	English 7 1/10000 · 1
94 ../../principles/network.rst:461 • ../../principles/network.rst:501 • ../../principles/network.rst:503 • ../../principles/network.rst:515 • ../../principles/network.rst:515 • ../../principles/network.rst:527 • ../../principles/network.rst:527 • ../../principles/network.rst:539 • ../../principles/network.rst:539

	English 1 1/10000 · 1
95 ../../principles/network.rst:461 • ../../principles/network.rst:461 • ../../principles/network.rst:513 • ../../principles/network.rst:513

	English none 4/10000 · 4
96 ../../principles/network.rst:463 • ../../principles/network.rst:463 • ../../principles/network.rst:465

	English 2 1/10000 · 1
97 ../../principles/network.rst:463

	English West 4/10000 · 4
98 ../../principles/network.rst:465

	English 3 1/10000 · 1
99 ../../principles/network.rst:465

	English East 4/10000 · 4
100 ../../principles/network.rst:468

	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
103 ../../principles/network.rst:497

	English R4's label forwarding table 27/10000 · 27
104 ../../principles/network.rst:501

	English ->R2 4/10000 · 4
105 ../../principles/network.rst:503 • ../../principles/network.rst:515

	English ->R5 4/10000 · 4
106 ../../principles/network.rst:506

	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
107 ../../principles/network.rst:509

	English R2's label forwarding table 27/10000 · 27
108 ../../principles/network.rst:518

	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
109 ../../principles/network.rst:521

	English R3's label forwarding table 27/10000 · 27
110 ../../principles/network.rst:525 • ../../principles/network.rst:527

	English ->R4 4/10000 · 4
111 ../../principles/network.rst:530

	English With the above `label forwarding table`, `R1` needs to originate the packets that belong to the `R1->R3->R4->R2->R5` circuit with `label=0`. The packets received from `R2` and belonging to the `R2->R1->R3->R4->R5` circuit would then use `label=1` on the `R1-R3` link. `R1` 's label forwarding table could be built as follows : 326/10000 · 326
112 ../../principles/network.rst:533

	English R1's label forwarding table 27/10000 · 27

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