
Configuring Dial Services
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The connection remains active for the time you specify in the Minimum Duration
Time parameter. This timer specifies the minimum amount of time the connection
is active. The timer must be set long enough to send complete routing updates to
the remote routers. The inactivity time, which starts at the same time as the
minimum duration timer, determines how long the connection remains active by
monitoring data inactivity. When there is no more data transmitting, the inactivity
time expires and the router deactivates the connection.
If you enable or disable dial-optimized routing dynamically while your demand
connection is active, the router deactivates the connection. If there is still data to
send after the call is cleared, the router places another call using the new
configuration for the dial-optimized routing feature.
Exceptions for Sending Routing Updates
Routing updates are sent independent of data transmission when:
• An IP or IPX interface becomes active for the first time.
When an IP or IPX interface first initializes, it sends routing updates to every
node in the network. If there is no data to send, the connection expires in the
time you specify in the Minimum Duration Time parameter.
• The RIP broadcast timer (IP) or RIP/SAP update interval (IPX) expires.
Each time the broadcast timer or update interval expires, the protocol can
request to send updates over an active connection. If you enable
dial-optimized routing, the value of the timer defaults to a high value so that
connections are infrequent. Reducing the value of the broadcast timer or
update interval defeats the purpose of dial-optimized routing.
If a connection is made because there is data to send, the router uses this
opportunity to send routing updates. Consequently, these timers reset instead
of expiring. This further reduces the frequency of connections made by a
protocol request.
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