[Nml-wg] Definitions of Topology, Domain and Network

[John Vollbrecht]

On Dec 16, 2009, at 9:12 AM, Aaron Brown wrote:

>
> A question still open is the definition of "connected"? Is it a  
> literal connected graph, or does it mean connected such that folks  
> could actually somehow make circuits to get from any point in the  
> graph to any other point (ignoring how they know that reservations  
> and the like can happen)?
This is a good question.  In my mind being able to make circuits (or  
connections) implies that there is an encapsulation and  
"concatenation"  capability at all points on the graph.

>
> For example, say someone has a switch with sonet ports and ethernet  
> ports and that switch connects to two other nodes, one via ethernet  
> and one via sonet. Is the implication that the node connected via  
> ethernet can connected to the node connected by SONET? If not, is  
> that a connected graph for these purposes, or are there two separate  
> topologies (the SONET one and the Ethernet one)?
I wonder if there needs to be a concept of "topology at a layer",  
where layer is a particular technology layer.


> Relatedly, if a topology is disjoint due to solely to switching  
> capabilities instead of cabling, is that two separate topologies or  
> a single topology?
I am not sure what you mean by this -- how would switching  
capabilities make something disjoint?

John