how many IMA group does one AIM-ATM support

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Mar 5th, 2010
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Hi i have a problem similar to another post i found on the forum, but without an answer . We have a network design similar to this :


Tha idea is to buy a 2821 with aim/atm bundle 4E1 Wvic, and on HubRouter make a 2E1 connection towards Branch_1, and another 2E1 connection towards Branch_2.Obviously the two connwction are different L3 connection, with differnet IMA-GROUP. Is this design supported with only ONE AIM/IMA slot ?

I found this configuration on cisco website :

in this there are all the E1 link boundled under IMA-GROUP 0 , and then configured the L3 under ATM/IMA0 interface, and under this interface there is nothing referred to ima-group 0; so i imagine the ima-group 0 is linked to ATM/IMA0 . If so, how can i configure more than 1 ima-group (if possible) and let it manage by only 1 AIM/IMA ?

thanks in advance


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Giuseppe Larosa Fri, 03/05/2010 - 01:04
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Hello Max,

two IMA groups each with 2 E1 should be possible and indeed expected

see this example

ima-group group# under physical interfaces to declare to what group they belong

and datasheet of ATM AIM

>> IMA 1.1 Support

Hope to help


Paolo Bevilacqua Fri, 03/05/2010 - 03:31
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Are you sue you still want to use IMA ?

There is a lot of wasted bandwidth with ATM at low speed, beside the added hardware complications.

For these reasons using simple IP or MLPPP is a better choice.


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