[j-nsp] Route Reflection

[Stephen Stuart]

> > This can be any ip on the router or it can be some other significant 
> > number
> > in dotted decimal. It is placed in the cluster_id field of reflected 
> > route
> > updates to prevent loops.
> 
> Most people use the IP of the router's loopback interface.  It doesn't 
> matter what IP you use, it just has to be unique.

It also has to be the same for all route-reflector servers that
"serve" a given set of route-reflector clients. This means that you
either nominate one router of the group of doing the serving to
provide the loopback to use as cluster identifier, or you create a new
space of numbers that don't overlap with your loopbacks (like 0.0.0.1
to identify your first cluster, 0.0.0.2 the second, and so on).

I personally favor the latter for clarity.

Stephen