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IPXRTR and its internal stack processes occupy about 290 KB of system memory. The amount of memory required beyond this baseline depends on the size of the internetwork---specifically, how many network numbers, RIP routes, and SAP-based services are supported throughout the internetwork.
For example, on an IPXTM internetwork using only NLSP as the routing protocol and having 400 network numbers, NLSP uses about 240 KB in addition to the 290 KB that IPXRTR requires. On an IPX internetwork using both NLSP and RIP/SAP and having about 3,000 network numbers and 1,600 services, NLSP uses about 600 KB in addition to the 290 KB baseline requirement.
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