On 4/23/2015 11:04 AM, Templin, Fred L wrote: > Hi Joe, ... >> There's nothing that requires that any network path "test all paths" in >> a multipath system. > > You are missing the point. With ECMP or LAG, a middlebox in the path > from the ingress to the egress selects a path for the tunneled packet > by examining information in the headers such as the flow label. ...
>> If the loss starts depending on the contents of the packets, I.e., "the point". >> then we'd >> need a new mechanism to provide feedback on existing packets as if they >> were all probes. I.e., out of scope. > The data packets themselves as probes is the only way to test the paths > that the data packets take. The probe reply is a Packet Too Big message. > But, if you get a PTB for a data packet that is smaller than 1280 you are > back to fragmentation. Or you don't support the necessary fragmentation and the link is declared down. Or you don't get the PTB (ICMP blocking), you're back to a black hole. Again, we'd need new mechanism and that's out of scope. Joe _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
