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Configuring IP Services
4-14
303528-A Rev 00
Estimating the Size of the Routing Table
IP allows you to estimate how many networks and hosts require an entry in the IP
routing table. The router uses your estimate to preallocate memory for the routing
table. Preallocation of memory increases the speed with which IP software can
learn routes because it removes the overhead caused by dynamic memory
allocation. Preallocation also makes better use of memory and reduces the amount
of memory required. By default, the router allocates resources to support 500
network and host entries in the routing table.
If you have enabled ISP mode, the default value is 40,000 entries. You must
reduce this value to an appropriate size if the system is running with 8-MB or
16-MB processor modules. Failure to change the value will result in an
out-of-memory error on these processors.
Avoid making an estimate that is excessively large; doing so will cause a wasteful
overallocation of memory.
Using Site Manager
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose
Protocols
.
The Protocols menu opens.
2. Choose
IP
. The IP menu opens.
3. Choose
Global
. The Edit IP Global Parameters window
opens.
4. Set the following parameters:
Estimated Networks
Estimated Hosts
Click on
Help
or see the parameter
descriptions beginning on page A-43.
5. Click on
OK
. Site Manager returns you to the
Configuration Manager window.
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