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At a given moment, all the IP datagrams from a particular source host to a particular destination host will typically traverse the same sequence of gateways. We use the term "path" for this sequence. Note that a path is uni-directional; it is not unusual to have different paths in the two directions between a given host pair.
A sequence of adjacent path elements over which a packet can f be transmitted, starting and ending with a node. A path is unidirectional. Paths are time-dependent, i.e., the sequence of path elements over which packets are sent from one node to another may change. A path is defined between two nodes.
PCE (Not in Scope) | PSE (In Scope) | |
---|---|---|
Operation | Centralized | Source-Routed or Distributed |
Communication | Slow, expensive | Fast, local |
Time Scale | hours and above | seconds and below |
Network Size | Large, many Tracks to optimize globally | Small, within one Track |
Considered Metrics | Averaged, Statistical, Shade of grey | Instant values / boolean condition |
Channel | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
---|---|---|---|---|---|---|---|
0 | S->A | S->B | B->C | B->D | C->F | E->R | F->R |
1 | A->C | A->D | C->E | D->E | D->F |