#PATH VECTOR CODE UPDATE#

The DV is basically an array (vector) that indicates the distance towards each known destination.Īn example of a DVR protocol is the Routing Information Protocol (RIP). The DVR protocol is an intra-domain routing protocol, that is, a protocol used inside a domain (by its hosts and routers).ĭVR is a type of protocol, where routers send regularly a Distance Vector (DV) to all its interfaces. DVR is used inside a domain, whereas PVR is used between domains.DVR sends distances, whereas PVR sends paths.Even neighbors need to manually configured unlike any distance vector or link state routing protocols. Secondly routes learned from other neighbors are never passed on unless validated by IGP (Rule of synchronization) differentiating it from link state routing protocol.

On the other hand BGP is said to be a path vector protocol because first it has many attributes by which path selection criteria can be tuned, even if we consider default metric which is AS path attribute, it doesn't know how the other AS is going to route the traffic (remember the Golden Rule of BGP) i.e., it is unaware that how many other routers/hops it needs to pass by.

#PATH VECTOR CODE UPDATE#

The 2 major quality of a distance vector protocol is that it will send the updates periodically and it's update would contain information only about directly connected neighbors whereas link state protocol sends information of all the known routes and does send it non-periodically (triggered update). As per my opinion distance vector protocol is named as such because it contains the information of the exact distance and where exactly it needs to head to reach the destination.

Path vector code