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13-2 Cisco BPX 8600 Series Reference
Routing Hubs and Interface Shelves
Frame relay connections originating at IPX interface shelves and frame relay, ATM, CESM, and
FUNI connections originating at MGX 8220 interface shelves are routed across the routing network
via their associated BPX routing hubs.
Note The IGX switch may also be configured as an interface shelf feeding frame relay connections
to a BPX routing hub.
Figure 13-1 Tiered Network with BPX and IGX Routing Hubs