
Configuring Dial Services
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• If the remote routers in your network are using IP, ensure that they also use the
Address Resolution Protocol (ARP) and not Inverse ARP. This enables the
local router to learn address information.
Adding Bandwidth Service for Congested Demand Lines
To relieve congestion across a demand line, you can use up to 29 additional lines
from an existing bandwidth-on-demand pool, providing a total of 30 lines for
communication. This feature is only for demand configurations that use PPP as
the data link layer protocol. Adding bandwidth to a congested demand line
benefits time-critical applications that require data to reach its destination
efficiently.
To provide more bandwidth for a demand circuit, you associate the demand circuit
with a bandwidth-on-demand pool, then you configure parameters that monitor
congestion across the line.
After you enable bandwidth-on-demand service, the router determines that the
demand line is congested when the traffic over the line exceeds a certain
user-configured threshold. The router that is configured as the congestion monitor
then searches for an available line from the bandwidth pool that you associate with
this demand circuit.
Lines in a bandwidth-on-demand pool can reside across slots, so you need to
designate each slot as either preferred or reserved. This determines the order in
which the router searches the slots for available lines; the preferred slot is first and
the reserved slot is second. If these slots have no available lines, the router
automatically uses the local slot. The local slot is the slot containing the first
demand line that was activated. When the router activates additional lines, they
adopt the configuration of the congested demand circuit.
PPP multilink is the protocol that enables the router to use multiple lines
simultaneously to transmit data. Multilink enables the router to use lines at
different speeds and to evenly distribute data across those lines. When you enable
multilink, you can configure a set of links between two peers into a single bundle.
The actual number of lines in a multilink bundle depends on hardware platform
constraints, total bundle speed, the speed of each link in the bundle, and the type
of traffic you are sending.
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