"LACP PDU Miss - Reason: LACP Link Down" ??

[scfrancis]

Hello everyone,

Our 6450 causes loss of network. The aggregate connections lose their link (see log)
Do you have an idea ?

Thank you in advance for your precious help.
cordially

PS: excuse me for my English, I am French and unfortunately not very good in English

TUE JUL 18 16:20:28 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:30 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:31 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:32 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:33 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:36 2017 LINKAGG info Actor & Partner are in SYNC with PDU exchange
TUE JUL 18 16:20:36 2017 LINKAGG info Aggregate UP . port: 1001 agg: 11
TUE JUL 18 16:20:38 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:39 2017 LINKAGG info Port Join . port: 2001 agg: 11
TUE JUL 18 16:20:39 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:40 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:41 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:42 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:43 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:45 2017 STP info Topology changed on VLAN/STP id 0
TUE JUL 18 16:20:56 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:57 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:58 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:20:59 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:00 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:01 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:01 2017 LINKAGG info Aggregate UP . port: 2005 agg: 13
TUE JUL 18 16:21:02 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:03 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:04 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:05 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:05 2017 STP info Topology changed on VLAN/STP id 0
TUE JUL 18 16:21:11 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:12 2017 LINKAGG info Aggregate UP . port: 2013 agg: 4
TUE JUL 18 16:21:12 2017 LINKAGG info Aggregate UP . port: 2018 agg: 7
TUE JUL 18 16:21:12 2017 LINKAGG info Aggregate UP . port: 2014 agg: 20
TUE JUL 18 16:21:12 2017 LINKAGG info Aggregate UP . port: 2019 agg: 14
TUE JUL 18 16:21:13 2017 LINKAGG info Aggregate UP . port: 2009 agg: 10
TUE JUL 18 16:21:13 2017 LINKAGG info Aggregate UP . port: 2020 agg: 21
TUE JUL 18 16:21:13 2017 LINKAGG info Aggregate UP . port: 2017 agg: 12
TUE JUL 18 16:21:13 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:14 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:15 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:15 2017 STP info Topology changed on VLAN/STP id 0
TUE JUL 18 16:21:16 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:17 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:18 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:19 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:20 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:24 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:25 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:26 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:27 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:30 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:31 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:32 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:33 2017 LINKAGG info LACP PDU Miss - Reason: LACP Link Down
TUE JUL 18 16:21:33 2017 LINKAGG info Actor & Partner are in SYNC with PDU exchange
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1009 agg: 10
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1018 agg: 7
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1014 agg: 20
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1005 agg: 13
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1019 agg: 14
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1017 agg: 12
TUE JUL 18 16:21:33 2017 LINKAGG info Actor & Partner are in SYNC with PDU exchange
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1020 agg: 21
TUE JUL 18 16:21:33 2017 LINKAGG info Actor & Partner are in SYNC with PDU exchange
TUE JUL 18 16:21:33 2017 LINKAGG info Port Join . port: 1013 agg: 4
TUE JUL 18 16:21:33 2017 LINKAGG info LACP Link 19 -> 1 is OUT_OF_SYNC agg_id=21
TUE JUL 18 16:21:35 2017 STP info Topology changed on VLAN/STP id 0

[devnull]

Looks like LACP is unstable may be a result of
- Link flapping (check interface statistics) - Replace transceiver, cables, check whether cable and transceivers (Multimode/Singlemode/Patchcables, all parts of line match)
- Check on other side of LACP Link as well.
- Lots of traffic/high CPU (CPU may be busy doing other Things (STP, Multicast handling .. ..)

What Firmware are you running?

[scfrancis]

Thank you for your answer !

Firmware running : 6.7.1.146.R01

[devnull]

What device(s) are connected to the 6450, what are the "other ends" for the LACPs?
What is CPU usage?

Try to upgrade to "latest and greatest" as this is what Support will request anyway.