In einer eMail vom 12.07.2008 21:02:46 Westeuropäische Normalzeit schreibt [EMAIL PROTECTED]:
On Sat, Jul 12, 2008 at 12:31 PM, <[EMAIL PROTECTED]> wrote: > In einer eMail vom 12.07.2008 18:16:25 Westeuropäische Normalzeit schreibt > [EMAIL PROTECTED]: > >>> http://bill.herrin.us/network/geoag-h1.gif. >> > >Okay, good. Now, based on the graph you just agreed to and the two FIB > >tables you just agreed to, route a packet from node H to node A. The > >path I compute is H->G->F->B->A. Do you get that path as well? > > Sure. There is your error. You violated the permission constraint: F is not a permitted node in the transit path between H and A. You added, as I asked for, the red arrows which indicate in which direction forwarding is allowed. >From G to F forwarding is allowed. Also from F to B. So why can't packets from H to A go along H-->G-->F-->B-->A ? I do not see any error. Heiner There is no trail of green arrows from H to F. There is also no trail of green arrows from A to F. Hence F is not permitted for a packet whose addresses are H and A. There is one permitted path from H to A: H->G->C->B->A. Each node in that chain has a trail of green arrows leading to it from either H or A. This designates permission. Would you like to redraw your red arrows? Can you think of a configuration of red arrows where you get *both* H->G->C->B->A *and* D->C->G->F->E ? -Bill -- William D. Herrin ................ [EMAIL PROTECTED] [EMAIL PROTECTED] 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
