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T23G sending 0x5c packets once a minute - Printable Version

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+---- Thread: T23G sending 0x5c packets once a minute (/showthread.php?tid=43034)

T23G sending 0x5c packets once a minute - DavidAUM - 07-29-2019 07:18 PM

Hello,

My T23G phone is sending out the exact same packet once every minute:

Code:
Ethernet Header
Ether Type: 0x5c(0x5c), Src=[80:5e:c0:44:f6:7e], Dst=[01:00:0c:cc:cc:cc]

Hex Dump:
01000ccc cccc805e c044f67e 005caaaa 0300000c 200002b4 *.......^.D.~.\...... ...*
6c7c0001 00145432 33473830 35454330 34344636 37450002 *l|....T23G805EC044F67E..*
00110000 00010101 cc00040a 0a0c6c00 03000c57 414e2050 *..............l....WAN P*
4f525400 04000800 00009000 05000400 06000854 32334700 *ORT................T23G.*
0b000501 00100006 0ed8                                *..........              *

It looked like multicast to me, but even with the intercom features disabled, the packets persist.

Thoughts?

Thanks,

David

RE: T23G sending 0x5c packets once a minute - Clan_Yealink - 08-01-2019 08:55 AM

(07-29-2019 07:18 PM)DavidAUM Wrote:  Hello,

My T23G phone is sending out the exact same packet once every minute:

Code:
Ethernet Header
Ether Type: 0x5c(0x5c), Src=[80:5e:c0:44:f6:7e], Dst=[01:00:0c:cc:cc:cc]

Hex Dump:
01000ccc cccc805e c044f67e 005caaaa 0300000c 200002b4 *.......^.D.~.\...... ...*
6c7c0001 00145432 33473830 35454330 34344636 37450002 *l|....T23G805EC044F67E..*
00110000 00010101 cc00040a 0a0c6c00 03000c57 414e2050 *..............l....WAN P*
4f525400 04000800 00009000 05000400 06000854 32334700 *ORT................T23G.*
0b000501 00100006 0ed8                                *..........              *

It looked like multicast to me, but even with the intercom features disabled, the packets persist.

Thoughts?

Thanks,

David
Hi David,

This is Clan from Yealink Support Team, nice to know you here!

From your description, I can see that these messages may be sent by LLDP and CDP. Yealink SIP Phone support LLDP and CDP functions, and the default state is on. When LLDP/CDP feature is enabled on the phones, the phones periodically advertise their own information to the directly connected LLDP/CDP-enabled switch.

BTW, Will sending these messages have any impact on you?

Best Regards!
Clan

RE: T23G sending 0x5c packets once a minute - DavidAUM - 08-01-2019 06:12 PM

CDP it is! Thank you.

The packets had no negative impact on my network. They were just new to me as the other Yealink phones on my network were older and, now I see, did not support CDP. New and unexpected packets make me curious.

Thank you for satisfying that curiosity!

David