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 :


Branch_1_Router=====HubRouter=====Branch_2_Router


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 :


http://www.cisco.com/en/US/tech/tk39/tk356/technologies_configuration_example09186a0080174992.shtml


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


Max

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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


http://www.cisco.com/en/US/docs/ios/atm/configuration/guide/atm_cfg_atm_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1005541


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


and datasheet of ATM AIM


http://www.cisco.com/en/US/products/hw/routers/ps282/products_data_sheet09186a0080088753.html#wp39992


>> IMA 1.1 Support


Hope to help

Giuseppe

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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