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chengxiw
Cisco Employee
Cisco Employee

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 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。

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