Because MLFR aggregates multiple link-layer channels onto a single network layer IP interface, protocol layering within the router is different than it is for nonmultilink Frame Relay. See Figure 7.
Figure 7: Structure of MLFR
The MLFR Link Integrity Protocol runs on each link in a bundle. However, from the major Frame Relay interface (the bundle) upward, the interface stacking is the same as for nonmultilink Frame Relay. For example, LMI runs only on the bundle. The bundle sends and receives all MLFR packets.
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