Path selection

Path alternative involves applying a acquisition metric to assorted routes, in adjustment to baddest (or predict) the best route.

In the case of computer networking, the metric is computed by a acquisition algorithm, and can awning such advice as bandwidth, arrangement delay, hop count, aisle cost, load, MTU, reliability, and advice amount (see e.g. this analysis for a account of proposed acquisition metrics). The acquisition table food alone the best accessible routes, while link-state or topological databases may abundance all added advice as well.

Because a acquisition metric is specific to a accustomed acquisition protocol, multi-protocol routers have to use some alien heuristic in adjustment to baddest amid routes abstruse from altered acquisition protocols. Cisco's routers, for example, aspect a amount accepted as the authoritative ambit to anniversary route, area abate authoritative distances announce routes abstruse from a allegedly added reliable protocol.

A bounded arrangement administrator, in appropriate cases, can set up host-specific routes to a accurate apparatus which provides added ascendancy over arrangement usage, permits testing and bigger all-embracing security. This can appear in accessible if appropriate to alter arrangement access or acquisition tables.

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