
Bandwidth-on-Demand Implementation Notes
114062 Rev. B 7-3
Figure 7-1. Multilink and Bandwidth-on-Demand Operation
For more information about PPP multilink, see Configuring PPP Services.
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 across links in 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 across links in a multilink 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.
Key
Secondary circuits
that are part of a multilink bundle
Leased line
New York City
Boston
ISDN
DS0003A
Monitor
router
Non-monitor
router
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