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Parameter Proposals For backoff, used SIP (rfc3261 17.1.1.2) as a starting point: “The default value for T1 is 500 ms. T1 is an estimate of the RTT between the client and server transactions. Elements MAY … use smaller values of T1 if it is known that the Query should be answered within the local network. T1 MAY be chosen larger, and this is RECOMMENDED if it is known in advance (such as on high latency access links) that the RTT is larger. Whatever the value of T1, the exponential backoffs on retransmissions described in this section MUST be used. The value of T2=64*T1.” Could allow T1 to be adaptive based on timing information for previous Queries for that MRI; however, it’s not clear how much value this provides You only really care about fine-tuning T1 for new flows/after route changes, when no valid feedback is available For handshake lifetime, probe and hello frequency: recommend a default value of 30 seconds (with SHOULD force). |