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Configuring PPP Services
2-16 114068 Rev. A
The multilink feature uses the automatically enabled functions of protocol
prioritization, but only for interrupt queuing. You cannot specify either traffic
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.
Differences between Multiline and Multilink
Both multiline and multilink use circuits consisting of one or more data paths
between two peer routers. Each has its special characteristics and advantages,
described in the following paragraphs and summarized in
Table 2-3.
Table 2-3. Comparing Multiline and Multilink
Feature Multiline Multilink
Advantages Fault tolerance
Bandwidth availability
Fault tolerance
Bandwidth availability
Uses all lines in the bundle for
greatest speed and efficiency
Number of
physical lines/
circuit
Up to 31 concurrent data
paths/group
Data paths can either be
physical or logical lines
(multiple independent data
paths running over a single
physical interface)
Up to 30 lines/bundle, depending
on platform constraints, total
bundle speed, variance in
member links speeds, and traffic
characteristics. Please consult the
Bay Networks Technical
Response Center in your area for
design guidelines.
Grouped/bundled
data paths
The data paths that together
make up a multiline circuit must
share the same speed, MTU,
and encapsulation method
Lines in a bundle can have
different speeds
Line types Can use leased lines Can use leased as well as
switched lines
Protocol
prioritization
Automatically enabled
User can specify protocol
priority and/or traffic filters
Automatically enabled
Not user configurable
Automatically assigns highest
(interrupt) priority to LCP
packets and assigns all others
normal priority
(continued)
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