Practical BGP

BGP Path Vector Implementation

BGP implements the path vector concept on a larger scale rather than treating a single router as a single point in the path to any given destination. BGP treats each autonomous system as a single point on the path to any given destination (Figure 1.3).

Figure 1.3. Path vector over a set of autonomous systems.

This case is identical to the case in Figure 1.2, except that each autonomous system is considered a point along the path rather than a single router. The network 10.1.1.0/24, typically referred to as a prefix, is advertised with the list of autonomous systems the update has passed through; this list of autonomous ...