Juniper ACX2000

and interleaving (LFI) for which fragmentation is not applied, corresponding Layer
2 overheads are added, as shown in Table 146 on page 2545.
Table 146: Layer 2 Overhead and Transmitted Packets or Byte Counts
LFIFragmentationProtocol
Second to n fragmentationsFirst fragmentation
BytesBytes
81213MLPPP (Long)
81011MLPPP (short)
81012MLFR (FRF15)
-810MFR (FRF16)
-1213MCMLPPP(Long)
-1011MCMLPPP(Short)
Layer 2 Statistics—Fragmentation Overhead Calculation
MLPPP/MC-MLPPP Overhead details:
===============================
Fragment 1:
Outer PPP header : 4 bytes
Long or short sequence MLPPP header : 4 bytes or 2 bytes
Inner PPP header : 1 byte
HDLC flag and FCS bytes : 4 bytes
Fragments 2 .. n :
Outer PPP header : 4 bytes
Long or short sequence MLPPP header : 4 bytes or 2 bytes
HDLC flag and FCS bytes : 4 bytes
MLFR (FRF15) Overhead details:
=============================
Fragment 1:
Framerelay header : 2 bytes
Control,NLPID : 2 bytes
Fragmentaion header : 2 bytes
Inner proto : 2 bytes
HDLC flag and FCS : 4 bytes
Fragments 2 ...n :
Framerelay header : 2 bytes
Control,NLPID : 2 bytes
Fragmentaion header : 2 bytes
HDLC flag and FCS : 4 bytes
2545Copyright © 2017, Juniper Networks, Inc.
Chapter 42: Operational Commands