
Configuring IP Services
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Estimating the Size of the Routing Table
IP allows you to estimate the number of networks and hosts that will 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-41.
5. Click on OK. Site Manager returns you to the
Configuration Manager window.
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