Hi Ken, On 13:30 Tue 28 Jun , Ken Schmidt wrote: > This is an updated patch for the DnUp routing algorithm. Any comments > are appreciated. > > This routing algorithm operates in a very similar fashion to UpDn, but > is modified to allow optimal routing on certain network structures in > which uplinks and CA nodes are connected to the same switch nodes. (For > example Chinook at EMSL.) In these networks the optimal paths between > nodes connected to a single chassis would remain within the chassis. > However due to the uplinks being connected at the same level of the > network as the CA nodes UpDn will not allow these paths to be used for > communication between the CA nodes. > > DnUp follows the same procedure as UpDn with a few differences. Ranking > is based solely on the relative distance from CA nodes, any switch node > with a CA node directly attached is assigned a rank of 0 any switch > node without a CA node attached is assigned a rank of one greater than > the minimum rank of their neighbors. Transitions are also reversed; > The initial direction is down and only one transition to up > is allowed. There is also an option which relaxes this restriction to > allow communication with switches nodes similar to the functionality of > connect_roots in UpDn. > > ---
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