Thanks. JP.
On Jan 5, 2006, at 11:44 AM, Payam Torab wrote:
Hi JP - Your question got lost in the middle of text.ad hoc routing fits in. There are two cases: 1. The routing progresses in step with the signaling. That is, each segment is computed and signaled, then the next segment is computed and signaled, and so on. In this case the each PCE is invoked independentlyand there is no cooperation or communication between PCEs. This isthe model shown in section 5.3. 2. The alternative is that all of the routing is done before any signaling isstarted. In this case, each PCE computes a segment of the path and passes the request on to the next PCE to compute the next segment. The segment paths are returned to the initial PCE which is able topass the full path to the PCC. But this is exactly the case described in 5.4. Clearly there are variables. - Does the initial PCE send requests to more than one other PCE? - Does the initial PCE suggest multiple border nodes? - Do the downstream PCEs return multiple paths with different qualities to allow the initial PCE to choose? If the answer to these and other questions is "no" then you have ad hoc routing.Payam, does this explanation close the point ? [PT] Yes- Adrian's update to clarify that the shared information can be TE information or path information closed this discussion. Thanks, Payam
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