When LFI is enabled, all large packets are fragmented. These packet fragments have a multilink header that contains a multilink sequence number. The sequence numbers on the fragments must be preserved so that the remote device receiving these fragments can correctly reassemble them into a complete packet. To accommodate this requirement, the software queues all fragmented packets on constituent links of a multilink bundle to a single queue (Q0), by default.
Although they are not fragmented, data packets smaller than the fragmentation threshold are also queued to Q0.
When you configure CRTP with LFI, CRTP packets on a multilink bundle from queues other than Q2 are queued to Q2 (instead of Q0) on the constituent links. Because CRTP packets are compressed and do not require fragmentation, they are treated as LFI (voice) packets and are sent to Q2 on the constituent links.
Figure 32 shows how traffic is queued on an MLPPP or MLFR multilink bundle and its constituent links. Irrespective of the packet queuing on the multilink bundle, the packets on the constituent links are queued according to the default setting so that traffic from all queues except Q2 is mapped to Q0.
Figure 32: Queuing on Constituent Links
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