Specifying the Number of Retransmission Attempts
You can specify the number of retransmission attempts the router uses for tunnels, in the range 2–7. By default, the router uses a retry count of 5.
Use the established keyword to apply the retry count only to established tunnels. Use the not-established keyword to apply the retry count only to tunnels that are not established. If you do not include a keyword, the router applies the retry count to both established and nonestablished tunnels.
host1(config)#l2tp retransmission 4 established