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How to determine the maximum number of dial-peers that can be configured on a router
The dial-peer options are available based on how much memory is available.
As an example, assume each dial-peer consumes 6k of memory, and that the router does not accept new dial-peers at the 80 percent threshold of memory allocation. This formula calculates the available dial-peer options:
(Free Memory * 0.8)/6k = maximum theoretical number of configurable dial-peers
This number represents the upper limit.
These points must also be considered:
Check the real amount of free RAM. Consider the real size of the decompressed Cisco IOS and any additional memory already used.
For each platform, it is necessary to calculate the real quantity of memory consumed by each dial-peer.
Caution: More dial-peers can adversely affect the performance of the router.
Issue the show memory command in order to determine the amount of memory that is used.