
Configuring Dial Services
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117353-B Rev. 00
Version 11.0 supports dial optimized routing only for IP and IPX. For all other
protocols, the router activates a demand connection for any type of routing packet,
regardless of whether you enable dial optimized routing. To avoid this problem,
you can configure traffic filters that prevent specific types of packets from
activating a connection. See Configuring Traffic Filters and Protocol
Prioritization for information about configuring filters.
What Happens When You Enable Dial Optimized Routing
The router activates a demand connection when there is data to send. The router
then alerts IP and IPX that a connection is active and that they can broadcast
routing updates. IP and IPX can also send triggered updates, if any occur while the
connection is active.
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.
Enabling Dial Optimized Routing for Frame Relay Demand Circuits
When you enable dial optimized routing for frame relay demand circuits, you
must also set the Routing Update Hold Time parameter. This parameter instructs
the router to wait for an active connection to the destination device before sending
RIP or SAP routing updates.
This timer is necessary if the UNI between the router and the switch is a dynamic
UNI, which means that the router learns the PVCs when it calls the frame relay
switch. The router contacts the switch for the first time using a statically
configured PVC. If the router sends routing updates over the static PVC, they will
not go over the PVCs that connect to the destination. By setting the Routing
Update Hold Time to a large enough value, you ensure the updates are sent to the
destination.
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