Cross cables not supported

hi all,
i had read in lots of documents cross cable is not supported for RAC environment.
My Environment is as follows:
OS : SUN SPARC SOLARIS 5.10
RDBMS : ORACLE 10.2.0 RAC
NODES : 2
SERVERS : V490
STORAGE : 3100
SWITCH : SAN
OS is installed on 2 nodes with 2 public ip, 2 private ip and 2 VIP.
Clusterware Environment:
CRS : /dev/rdsk/c*s5 : 1GB : External Redundancy
Voting Disk : /dev/rdsk/c*s6 : 1GB : External Redundancy.
Actually we are using cross cables for cluster inter connect but oracle is not recommending and supporting too.
1). How to configure ipmp for public and cluster inter connect.
2). What are the required hardware to complete this.
Plz let me know how to do this.
3). What is the actual problem of using cross cables.
Plz let me know answer from the great experts.

Cross Cables doesn't provide high speed data transfer
between the nodes.Huh? Can you explain this?? How can it be possible?
Certainly, Oracle does not support crossover cables, and there are reasons, but I hardly believe it's due to performance.

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