本文書では、CAPWAP-Data Keep-Alive の NG 時の動作について説明します。
通常 RUN の状態では、CAPWAP-Data Keep-Alive のパケット通信を、約 30 秒毎にやり取りを行います。
パケットの表示例：
231 2022/194 13:25:23.071 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
232 2022/194 13:25:23.071 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 84 CAPWAP-Data Keep-Alive
356 2022/194 13:25:51.579 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
357 2022/194 13:25:51.579 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 84 CAPWAP-Data Keep-Alive
WLC が AP からの CAPWAP-Data Keep-Alive パケットに応答しない場合、約 3 秒後、6 秒後、12 秒後、12 秒後、再送します。
パケットの表示例：
1 2022/194 20:40:46.515 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
2 2022/194 20:40:46.515 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 84 CAPWAP-Data Keep-Alive
16 2022/194 20:41:16.512 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
→一回目
17 2022/194 20:41:19.512 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
→二回目3秒後
23 2022/194 20:41:25.511 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
→三回目6秒後
32 2022/194 20:41:37.510 192.168.XXX.XXX 192.168.XXX.XXX CAPWAP-Data 92 CAPWAP-Data Keep-Alive
→四回目12秒後
デバッグログ上の表示例：
*capwapSocketTask: May 07 07:12:36.187: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:12:36.187: XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX
*capwapSocketTask: May 07 07:12:38.902: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:12:38.902: XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX:5248
*capwapSocketTask: May 07 07:12:44.604: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:12:44.604: XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX:5248
*capwapSocketTask: May 07 07:12:56.008: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:12:56.008: XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX:5248
*capwapSocketTask: May 07 07:13:07.412: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:13:07.412: XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX:5248
*capwapSocketTask: May 07 07:13:18.815: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:13:18.815:XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX:5248
*capwapSocketTask: May 07 07:13:30.219: XX:XX:XX:XX:XX:XX Data Keepalive received on IP 192.168.XXX.XXX, port 5247 with offset 42
*capwapSocketTask: May 07 07:13:30.219: XX:XX:XX:XX:XX:XX Data Keepalive packet reflected back to 192.168.XXX.XXX:5248
上記のデバッグログは、AP から WLC に実行される CAPWAP-Data Keep-Alive のパケット通信です。WLC では応答していますが、
そのパケットが当該 AP に届かず、約 3 秒後、約 6 秒後、約 12 秒後と 12 秒後に再送します。
