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crypto isakmp keepalive performance impact

Hi all,

We have a Cisco router that we use as a VPN gateway. We are terminating about 50 VPN tunnels on that router i.e we have 50 VPN peers.

I need to know that if I enable "crypto isakmp keepalive" on the router then how would that impact the performance of the router? It is a Cisco 2821 router.

What are the pros and cons of configuring crypto isakmp keepalive globally on the router?

Thanks,

Humair

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