crypto isakmp keepalive??

[abhi-adte]

     hi,

I like to know about the "crypto isakmp keepalive" this command with "on demand" option pls help to share the knowledge.

[Jennifer Halim · Accepted solution]

"on-demand" is the default behaviour of isakmp keepalive --> it only sends the keepalive if traffic is not received through the tunnel on the time specific in the keepalive command.

compared to "periodic" where the keepalive is constantly sent on the time specific in the keepalive command.

Here is more information for your reference:

http://www.cisco.com/en/US/partner/docs/ios/security/command/reference/sec_c4.html#wp1057298

Hope that helps.