cnp3-ebook/protocols/routing — English @ Weblate

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51 ../../protocols/routing.rst:160

	English Fortunately, it is possible to perform `per-flow` load balancing without maintaining any state on the router. Most routers today use hash functions for this purpose :rfc:`2991`. When a packet arrives, the router extracts the Next Header information and the four-tuple from the packet and computes : 298/10000 · 298
52 ../../protocols/routing.rst:162

	English :math:`hash(NextHeader,IP_{src},IP_{dst},Port_{src},Port_{dst}) \pmod{N}` 73/10000 · 73
53 ../../protocols/routing.rst:164

	English In this formula, `N` is the number of outgoing interfaces on the equal cost paths towards the packet's destination. Various hash functions are possible, including CRC, checksum or MD5 :rfc:`2991`. Since the hash function is computed over the four-tuple, the same hash value will be computed for all packets belonging to the same flow. This prevents reordering due to load balancing inside the network. Most routers support this kind of load-balancing today [ACO+2006]_. 470/10000 · 470
54 ../../protocols/routing.rst:169

	English Footnotes 9/10000 · 9
55 ../../protocols/routing.rst:170

	English See http://bgp.potaroo.net/index-as.html for reports on the evolution of the number of Autonomous Systems over time. 116/10000 · 116
56 ../../protocols/routing.rst:173

	English OSPF can support `virtual links` to connect routers together that belong to the same area but are not directly connected. However, this goes beyond this introduction to OSPF. 174/10000 · 174
57 ../../protocols/routing.rst:175

	English The OSPF Designated Router election procedure is defined in :rfc:`2328`. Each router can be configured with a router priority that influences the election process since the router with the highest priority is preferred when an election is run. 243/10000 · 243
58 ../../protocols/routing.rst:178

	English In some networks, there are several dozens of paths towards a given destination. Some routers, due to hardware limitations, cannot install more than 8 or 16 paths in their forwarding table. In this case, a subset of the computed paths is installed in the forwarding table. 272/10000 · 272
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