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SMTP load balancing with cisco

Posted on 2010-08-29
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Last Modified: 2012-05-10
Any one hav experience for load balancing SMTP relay servers (in DMZ) with cisco switches.
Please help
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Question by:anishpeter
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Expert Comment

by:gcl_hk
ID: 33555919
For SMTP relay load balancing which should apply on OS or others, but not switching device.

For exp.

External SMTP load balancing you can use mx record round robin.
Internal SMTP load balancing you can use Ms NLB
 
 
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by:anishpeter
ID: 33555928
My device is appliance. I cannot use NLB.  As same like we load balance servers and firewalls, can I load balance Mail relays appliances using netwrok load balancing in Cisco?
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gcl_hk earned 500 total points
ID: 33556069
Of coz, Cisco have the load balancing technology on networking field (like GLBP, VRRP), but which is not to serve your application.

As my reply above, external SMTP load balancing by MX round robin is most common method around the world.

If you want to load balancing SMTP relay between mail server and mail gateway, you should set the configuration on mail server side. For exp. of MS Exchange, you can define multiple "smart host" to achieve load balancing between mail server and mail gateway.


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by:anishpeter
ID: 33556117
Ok. I agree with you. Then how should  I set priority,

SMTP 1 MX 10
SMTP2  MX 20

or

SMTP 1 MX 10
SMTP2  MX 10

Any issues you forsee for old mail realys not adhere to RFC Standard, which is contacting my Mail relay.  My one mail relay should work if other server unavilable or SMTP Service hangs.
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Expert Comment

by:gcl_hk
ID: 33556330
Should be same priority for your case.

Check here for more details:
http://www.zytrax.com/books/dns/ch9/rr.html
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Expert Comment

by:gcl_hk
ID: 33556365
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by:anishpeter
ID: 33556417
But all articles say about load balancing of services. But if one of my SMTP relay fails, what to do?
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Expert Comment

by:gcl_hk
ID: 33556483
Actually I'm not expert on DNS, the following link which have talking about  "DNS based Load Balancing with Fault Tolerance", have a look:

http://www.presttun.org/kare/DNS/DNS-LB-FT.pdf

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Author Comment

by:anishpeter
ID: 33559425
Hi.. qcl,
  The document is not relevent to SMTP  Appliance load balancing.   Any more ideas?
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Author Comment

by:anishpeter
ID: 33603427
Any Ideas about SMTP loadbalancing using any hardware appliances. Please reply
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Author Closing Comment

by:anishpeter
ID: 33609155
Good Solution. I have done SMTP loadbalancing and Failover successfully with DNS RR with same priority. Internally I put two Smarthost records.
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