{6.3} says:
"Two Network Maps are the same if (1) they are retrieved from the same
ALTO Server (i.e., same Hostname + Port) and (2) ...."
Isn't (1) overly restrictive? That means an organization cannot run
multiple ALTO servers, on different hosts/ports, which share the same
network map and cost maps.
Yes, the last sentence of that paragraph says "If a logical ALTO Server is
implemented by multiple load balance servers with the same Hostname +
Port, the servers need to ensure the consistency." But isn't that
referring to a transparent load balancer, where the client always uses the
same host/port and has the illusion that it's a single server?
BTW, in {8.5.4}, the ALTO server at custom.alto.example.com presumably
uses the same network map as the server at alto.example.com in {8.5.3}.
I'm not sure how to resolve that without introducing some notion of ALTO
servers being "compatible". Maybe change the sentence to
"Two Network Maps are the same if (1) they are retrieved from compatible
ALTO servers and (2) .... Two ALTO servers are compatible if one server's
Information Resource Directory {8.5} references services, including the
Information Resource Directory, provided by the other server."
- Wendy Roome
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