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AC to IP phone packets dr...

AC to IP phone packets dropped

Latest reply: Oct 23, 2018 04:06:51 1737 10 12 0 0
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Issue Description

Topology : AC--Core switch ----- Access switch ------ AP - - - IP Phone(Cisco)

Issue :AC ping AP is normal ,and delay is 1ms , but AC ping IP Phone delay is more than 50ms and some packets been dropped.

Handling Process

Using below command to check the AP signal is normal or not :

display station AP-id xxx , check the RSSI value found all is between -60 and -50 , so RSSI is normal ;

display radio AP-id xxx , check the CE/ME and CU value , all is normal .

then using AC ping station , like below : find delay is more than 50ms and packets lost ..

16:36:53 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1390 ttl=63 time=78 ms
16:36:54 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1391 ttl=63 time=70 ms
16:36:54 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1392 ttl=63 time=60 ms
16:36:55 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1393 ttl=63 time=53 ms
16:36:55 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1394 ttl=63 time=46 ms
16:36:56 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1395 ttl=63 time=37 ms
16:36:56 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1396 ttl=63 time=31 ms
16:36:57 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1397 ttl=63 time=156 ms
16:36:57 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1398 ttl=63 time=169 ms
16:36:58 2018-10-9    Request time out
16:37:00 2018-10-9    Request time out
16:37:02 2018-10-9    Request time out
16:37:04 2018-10-9    Request time out
16:37:06 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1403 ttl=63 time=631 ms
16:37:06 2018-10-9    Request time out
16:37:08 2018-10-9    Request time out
16:37:11 2018-10-9    Request time out
16:37:13 2018-10-9    Request time out
16:37:15 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1408 ttl=63 time=1900 ms
16:37:16 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1409 ttl=63 time=168 ms
16:37:17 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1410 ttl=63 time=159 ms
16:37:17 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1411 ttl=63 time=150 ms
16:37:18 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1412 ttl=63 time=142 ms
16:37:18 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1413 ttl=63 time=131 ms
16:37:19 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1414 ttl=63 time=119 ms
16:37:19 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1415 ttl=63 time=112 ms
16:37:20 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1416 ttl=63 time=101 ms
16:37:20 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1417 ttl=63 time=94 ms
16:37:21 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1418 ttl=63 time=85 ms
16:37:21 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1419 ttl=63 time=76 ms
16:37:22 2018-10-9    Reply from x.x.x.x: bytes=56 Sequence=1420 ttl=63 time=67 ms

but using AC ping AP, the delay is 1ms, it's normal.

then login AP check, display station station-mac XXXX , find station state of Power-save mode enabled is YES.

You can find IP Phone is in sleep mode, so when using AC ping it, delay is abnormal and packets lost, but if when the customer using it in calling, we found ping is normal and check the Power save mode enabled state is NO.

Root Cause

Cisco IP Phone has a sleep mode, but when in calling, you can see ping is normal, and even IP phone is roaming, it will drop at most 3 packets, and some time will not drop even 1 packet.

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2#
yjhd
Created Oct 18, 2018 01:31:04

This post was last edited by yjhd at 2018-10-31 09:04. this is a page for access network, access network is very important, it can help me.
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3#
Mark.hu
Created Oct 18, 2018 02:08:42

This post was last edited by Mark.hu at 2018-10-31 06:46. Before that, I also encountered a problem with docking cisco ip phone. Do you have any similar cases and share it with me? Because I have been troubled by that problem for a long time, I have not found a solution.
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4#
Torrent
Created Oct 18, 2018 02:12:04

This post was last edited by Torrent at 2018-10-31 07:25.

To collect performance statistics, run the statistics enable command to enable the performance statistics function.

Precautions

After the undo statistics enable command is run, the performance statistics task that is running will be stopped. Therefore, exercise caution when you run this command.


we can do this to confirm where dropped the packets I think.
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5#
GongXiaochuan
Created Oct 18, 2018 03:48:23

This post was last edited by GongXiaochuan at 2018-10-30 05:44.

IP phone sleeping will cause this issue . good to know AC to IP phone packets dropped-2779889-1

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6#
Skay
Created Oct 18, 2018 11:03:48

Thanks for your sharing , i encountered the same issue , but cannot find any example on document .
Cisco IP Phone has sleep mode , but when in calling , you can see ping is normal ,and even IP phone is roaming , it will drop at most 3 packets , and some time will not drop even 1 packet .
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7#
zChan
Created Oct 19, 2018 02:58:34

Very clear explanation.
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8#
No.9527
Created Oct 19, 2018 03:29:56

This post was last edited by No.9527 at 2018-10-31 06:47. To set a stack priority for a member switch in a stack, run the stack slot priority command. A larger priority indicates a higher priority, meaning that a switch is more likely to be selected as a master switch.
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9#
yangyong
Created Oct 19, 2018 09:39:07

I just face similar issue, thanks for sharing, it resolve my issue.AC to IP phone packets dropped-2781607-1
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10#
lizhi94
Created Oct 19, 2018 09:44:39

This post is novel in concept, with unique ingenuity, clear passages, different plots, ups and downs, distinct lines, fascinating and fascinating literary skills. It can be described as a word and a classic sentence, which is a model that my generation should learn.
I was already disappointed with this community. I feel that this community has no future, and my heart is full of sorrow. But after reading this post, I made hope for the community. It is you who let my heart rekindle the fire of hope. It is you who have revived my heart. You saved me a cool and cool heart!
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