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Bandwidth-on-Demand Implementation Notes
114062 Rev. A 6-3
Multilink Fragmentation
Multilink fragmentation splits datagrams into smaller packets when necessary and
sends these packets across links in a multilink bundle. Fragmentation improves
the distribution of data across multilink lines and uses buffer resources more
efficiently, thereby improving communication over bandwidth circuits. Bay
Networks routers comply with RFC 1717, which defines PPP multilink.
Packets sent over a multilink bundle have an outer header packet that contains a
unique packet sequence number and allows for the following:
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 destination router
For more information about multilink and fragmentation, refer to Configuring
PPP Services.
Protocol Prioritization
When you configure a router, you can prioritize the different types of traffic sent
across a line. This process is called protocol prioritization. When you configure
leased bandwidth circuits, the router automatically enables protocol prioritization.
PPP multilink uses the automatically enabled functions of protocol prioritization,
but only for interrupt queueing. You cannot specify either filters or priorities.
Multilink assigns the highest (that is, interrupt-level) priority to link control
packets, treating all other traffic as normal priority. This gives PPP control
messages precedence over other types of data while preserving the packet
sequencing.
For more information about protocol prioritization see Configuring Traffic Filters
and Protocol Prioritization.
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