Multiple CNAME records for le même fully-qualified domain name is a violation of le specs for DNS. Some versions of BIND would allow you to do this (some seulement si you specified le multiple-cnames yes option) et would round-robin load-balance entre alors mais c'est pas technically legal.
Il y a pas supposed to be resource records (RRs) avec le même name as a CNAME and, to pick nits, that would include multiple identical CNAMEs. Quoth RFC 1034, Section 3.6.2:
If a CNAME RR is present at a node, no autre data should be present;
this ensures that le data for a canonical name et its aliases cannot
be different. This rule aussi insures that a cached CNAME can be used
sans checking avec an authoritative server for autre RR types.
The letter-of-the RFC method to handle what you're doing would be avec a single CNAME referring to a load-balanced "A" record.
