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1-12 Cisco BPX 8600 Series Reference
BPX Switch Operation
Figure 1-4 Tiered Network with BPX Switch and IGX Switch Routing Hubs
Inverse Multiplexing ATM
Where greater bandwidths are not needed, the Inverse Multiplexing ATM (IMA) feature provides a
low cost trunk between two BPX switches. The IMA feature allows BPX switches to be connected
to one another over any of the 8 T1 or E1 trunks provided by an AIMNM module on an MGX 8220
shelf. A BNI port on each BPX switch is directly connected to an AIMNM module in an MGX 8220
by a T3 or E3 trunk. The AIMNM modules are then linked together by any of the 8 T1 or E1 trunks.
Refer to the Cisco MGX 8220 Reference and the Cisco WAN Switching Command Reference
publications for further information.