The statement in the book means that either all IBGP peers are fully
meshed ( which is a logical mesh not mandatory a physical one ), or use
Route Reflectors to reduce the number of IBGP sessions needed. 

  For example, if you have 10 routers that want to run IBGP over, those
10 routers doesn't have to have direct physical connections from each
router to the others to initiate this Full Mesh - logical - IBGP
sessions.

 

 Another example, we can have a full logical IBGP sessions between those
3 routers

which are Ra-Rb, Ra-Rc, Rb-Rc while not having a full physical mesh ( Ra
& Rc are not directly physically connected together )

RouterA----------RouterB-------RouterC

 

 

>Group,

> >In reading the BSCN book, I have stumbled across something confusing
when it >is discussing "route reflectors". The books states that the use
of route >reflectors eliminates the need to run BGP in a full mesh
environment. Based >on this statement I have assumed that BGP therefore
must be configured only >on a network that is fully meshed (unless route
reflectors are used). Is >this true? > >Robert D. Cluett, CCNA > > > >
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