Link Fragmentation and Interleaving (LFI)
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
Figure 43: MLPPP Header in Long Sequence Number Format
The (B)eginning fragment bit is a one bit field set to 1 on the first fragment derived
from a PPP packet and set to 0 for all other fragments from the same PPP packet.
The (E)nding fragment bit is a one bit field set to 1 on the last fragment and set to
0 for all other fragments. A fragment may have both the (B)eginning and (E)nding
fragment bits set to 1.
Between the (E)nding fragment bit and the sequence number is a reserved field,
whose use is not currently defined, which must be set to zero. It is 2 bits long
when the use of short sequence numbers has been negotiated, 6 bits otherwise.
(Currently short sequence number format is supported.)
The FCS field shown in the diagram is inherited from the normal framing
mechanism from the member link on which the packet is transmitted. There is no
separate FCS applied to the reconstituted packet as a whole if transmitted in more
than one fragment.
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