[rbridge] Terminology Change?

[Joe Touch]

Eric Gray wrote:
> Silvano/Radia/Donald/Erik/Dinesh,
> 
> Based on an inconsistency pointed out during a review, I need to make
> some of the terminology definitions more consistent.
> 
> I propose changing the following two definitions - 
> 
>    o  Egress RBridge: for any specific frame, the RBridge through 
>       which that frame leaves the TRILL Campus. For frames 
>       transiting a TRILL Campus, the egress RBridge is an edge 
>       RBridge where RBridge encapsulation is removed from the 
>       transit frames prior to exiting the TRILL Campus. 
>    o	Ingress RBridge: for any specific frame, the RBridge through 
>       which that frame enters the TRILL Campus. For frames 
>       transiting a TRILL Campus, the ingress RBridge is the edge 
>       RBridge where RBridge encapsulation is added to the transit 
>       traffic entering the TRILL Campus.  
> 
> - to read as follows:
> 
>    o  Egress RBridge: for any specific frame, the RBridge at which 
>       the TRILL header is removed from the frame prior to delivery
>       to an end station (possibly via a LAN).  

This seems confusing, in that the LAN includes the campus and all stub 
segments. Did you mean "possibly via a stub segment"? Alternately, I'd 
keep the notion that once you leave a campus you leave forever, i.e., 
you can't leave a campus and enter it again.

>    o  Ingress RBridge: for any specific frame, the RBridge at which 
>       a TRILL header is added to the frame prior to being forwarded
>       to one or more other RBridges. 

Overall, I prefer the form that describes entering/leaving the campus in 
addition to adding/removing TRILL headers. The former is architectural, 
the second procedural, and defining them together couples the two in 
useful ways.

Joe

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