Avaya Configuring PPP Services Manual do Utilizador Página 41

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PPP Concepts
114068 Rev. A 2-15
When you enable fragmentation, you can specify the minimum-size packet that
you want PPP to consider fragmenting. (The default minimum size is 256 bytes.)
Even with fragmentation enabled, PPP generally avoids splitting packets unless
network performance considerations warrant it.
When necessary, PPP splits packets into fragments and then sends the fragments
over the lines in the bundle, reassembling them on the receiving peer into the
proper sequence. PPP discards all fragments of an incomplete reassembly. The
number of fragments is equal to or less than the number of lines available. For
bundles containing lines of different speeds, PPP tries to send the smaller
fragments over the slower lines. This mechanism ensures a more even flow of
data.
Packets sent over a multilink bundle have an outer header packet that contains a
unique packet sequence number and allows for
Fragmentation of the original packets
Assignment of sequence numbers to each fragment
Transmission over a number of links in the bundle
Reassembly of the original sequence and packet size at the receiving peer
Using Protocol Prioritization with Multiline and Multilink
When you configure a router, you can prioritize the different types of traffic sent
across a synchronous line. This process is called protocol prioritization. The
ability to prioritize traffic is important because some types of operations require
faster responses than other types. For example, PPP control messages must have
precedence over other types of data.
Selecting PPP on a circuit automatically enables protocol prioritization without
specifying any filters.
With the multiline feature, you can configure both priorities and filters. For more
information about protocol prioritization, see Configuring Traffic Filters and
Protocol Prioritization.
Note: BNX software uses a different protocol prioritization mechanism from
that described in this section. For information on BNX traffic prioritization and
congestion control mechanisms, refer to Configuring Customer Access and
Trunks (BNX Software).
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