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3.1.2 Timers

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The following timers are used by the PAC/PNS.

Echo Timer: The "keep alive" timer used by the PAC/PNS for sending the Echo-Request message (section 3.1.5.5) to the peer as specified in [RFC2637] section 3.1.4. The value of this timer is 60 seconds.<2>

Packet Acknowledgment Timer: This timer is used to determine whether an acknowledgment for a GRE packet has to be sent if there are no outstanding GRE packets to be sent, when a packet is received by a PAC/PNS. The value of this timer is 100 milliseconds.

Control Connection Idle Timer: The timer used by the PAC/PNS to close a control connection when the connection is not in the established state within the time period specified by this timer. The value of this timer is 30 seconds, rather than 60 seconds as specified in [RFC2637] section 3.1.4. For more information, see section 3.1.5.1.