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Bandwidth-on-Demand Implementation Notes
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 automatically enables protocol prioritization, but only for interrupt
queuing. You cannot specify filters or priorities. Multilink assigns the highest (that
is, interrupt-level) priority to link control packets, giving PPP control messages
priority over other types of data while preserving the packet sequencing.
For more information about protocol prioritization, see Configuring Traffic Filters
and Protocol Prioritization.
Defining the Role of the Router in the Network
Leased bandwidth circuits are point-to-point connections. For each circuit, you
must designate a router at one end of the connection as the congestion monitor.
The congestion monitor checks the congestion of the lines in a multilink bundle. If
this router discovers congestion, it activates secondary lines. The router at the
other end of the connection, the non-monitor router, does not have the authority to
activate a secondary line. Do not set the Bandwidth Mode parameter to the same
value for both routers. This will prevent the routers from activating a second line
simultaneously.
You define the role of the router using the Bandwidth Mode parameter, which is
part of the bandwidth circuit configuration (refer to Chapter 8).
Balancing Traffic between Lines in a Multilink Bundle
With multilink enabled for bandwidth-on-demand service, the router divides the
outbound data traffic among all links in the bundle. The external clock speed of
each line determines how much of the total traffic each link receives. On the
receiving end, multilink resequences packets arriving on different links using the
sequence number from the multilink header.
For more information about traffic distribution, see Configuring PPP Services.
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