[INFO] LAB test of OPTIONS PING feature in the session-agent
LAB test of OPTIONS PING feature in the session-agent.
1. ping-interval parameter:
You can get the following interval time if you don't receive any response from session-agent. (ping-interval is 50s.)
CSeq No. Time Message
============================================
CSeq: 4 11:33:24.008 OPTIONS -------->
11:33:24.010 <--------- 200 OK
CSeq: 5 11:34:14.010 OPTIONS & Retransmission -------->
CSeq: 6 11:35:04.012 OPTIONS & Retransmission -------->
CSeq: 7 11:36:43.995 OPTIONS & Retransmission -------->
CSeq: 8 11:40:03.978 OPTIONS & Retransmission -------->
CSeq: 9 11:43:23.980 OPTIONS & Retransmission -------->
CSeq: 10 11:46:43.982 OPTIONS & Retransmission -------->
CSeq: 11 11:50:04.487 OPTIONS & Retransmission -------->
In summary, ping-interval is increased to 50, 100, 200, 200, 200, ...... ( 1X, 2X, 4X, 4X...... ).
2. ping-send-mode: continuous vs keep-alive
continuous: SD keeps sending OPTIONS PING to the session-agent even if SD forwards any traffic to session-agent.
keep-alive: If SD forwards any traffic to session-agent, SD does not send OPTIONS PING to the session-agent, and If SD does not forward any traffic to session-agent, SD sends OPTIONS PING to the session-agent after ping-interval time.