The TFO accelerator is overloaded (connection limit) and MAPI problems

Answered Question
Jan 7th, 2010
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Hi All!


Problem description:

When MAPI acceleration (exchange/outlook) is Active in our WAAS environment, the remote site users randomly lose connection to the Exchange server (on hub site), if I disable the MAPI acceleration everything works ok.  so right now we are running with MAPI accelearation Disabled


I can see that we often get max_conn_reject The TFO accelerator is overloaded (connection limit), we haven't done any adjustments to the default configuration. 


The environment is one Hubsite with two remote sites.


[Hub Site] 34mbit

HW=OE674

SW=4.1.5

inline

Enterprise Lic


[Remote Site1] 4 mbit

HW=OE474

SW=4.1.5

inline

Enterprise Lic


[Remote Site2] 4mbit

HW=OE474

SW=4.1.5

inline

Enterprise Lic


So the question is how to solve this?!                                

Correct Answer by Eric Rose about 7 years 4 months ago

I had a feeling that you might have alot of computer remotely.


One of the main factors in sizing a WAAS soluiton is to keep in mind the number of TCP connections that a single WAE can optimize.

We limit the device on optimized TCP connections.After you hit the limit the device will go into the overload state that you mentioned.


274 - 200 connections

474 - 400 connections.


Typically from a sizing a single workstation would be sized from 7-10 TCP connections.

The 2nd factor in sizing is bandwidth - WAAS doesn't limit bandwidth but this is recommended for the CPU throughput.


274 - 2 Megs

474 - 4 Megs


The 3rd factor is redundancy,. HA, etc.


Thanks,

Eric

     remember if this answrs your questions, please mark as answered and with a 5.

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Eric Rose Thu, 01/07/2010 - 05:08
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  • Cisco Employee,

How many users / computers are at the remote locations?

PerstorpNIH Thu, 01/07/2010 - 05:18
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Hi Eric!


Remote site1 = 450 computers

Remote site2 = 250 computers


/Hakan

Correct Answer
Eric Rose Thu, 01/07/2010 - 05:26
User Badges:
  • Cisco Employee,

I had a feeling that you might have alot of computer remotely.


One of the main factors in sizing a WAAS soluiton is to keep in mind the number of TCP connections that a single WAE can optimize.

We limit the device on optimized TCP connections.After you hit the limit the device will go into the overload state that you mentioned.


274 - 200 connections

474 - 400 connections.


Typically from a sizing a single workstation would be sized from 7-10 TCP connections.

The 2nd factor in sizing is bandwidth - WAAS doesn't limit bandwidth but this is recommended for the CPU throughput.


274 - 2 Megs

474 - 4 Megs


The 3rd factor is redundancy,. HA, etc.


Thanks,

Eric

     remember if this answrs your questions, please mark as answered and with a 5.

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