2xC350 in High Availability Mode (Cluster Mode)

Hello all,
first of all, i`m a newbie in ironport. So Sorry for my basic questions, but i can`t find anything in the manuals.
I want to configure the two boxes in High Availability Mode (Cluster Mode) but i don`t understand the ironport cluster architecture.
1) in machine mode i can configure IP-Adresses -> OK
2) in Clustermode i can configure listeners and bind them to a IP-Address -> OK
But how works the HA?
A) Should i configure on both boxes the same IP to use one MX Record? And if one box is down the other takes over?
B) Or should i configure different IPs and configure two MX Records?
And if one box is down the second MX will be used.
Thanks in advance
Michael

The ironport clustering is for policy distribution only - not for smtp load mgmt.
A) Should i configure on both boxes the same IP to use one MX Record? And if one box is down the other takes over?
Could do - using NAT'ing on the f/w but few large business take this approach today.
Many/most large businesses use a HW loadbalancer like an F5, Foundry ServerIron, etc. The appliances themselves would be set up on seperate IP addresses. Depending on the implementation requirements, the internal IP address could be a public IP or a private IP.
B) Or should i configure different IPs and configure two MX Records?
And if one box is down the second MX will be used.
If you set up two boxes, even with a different MX preference, mail will be delivered to both MX records. There are broken SMTP implementations that get the priority backwards, and many spammers will intentionally attempt to exploit less-restrictive accept rules on secondary MX recievers and will send to them first.

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Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
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2xC350 in High Availability Mode (Cluster Mode)

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