Switch BD 15.6 port peak utilzation moved to 100% only on 1 port in LACP

[Saurabh_Makkar]

1 port in LACP TX utilization is reaching 100%, average traffic on both these ports are 17% average.

MPGWLCTC> A 1000 4.09 100.00 8.05 100.00 --> 1:48
MPGWLCTC> A 1000 8.72 8.72 7.95 8.17 --> 2:48

Config Current Agg Ld Share Ld Share Agg Link Link UpMaster Master Control Algorithm Group Mbr State Transitions
==============================================================================
1:47 1:47 LACP L3_L4 1:45 - R 0
L3_L4 1:47 Y A 0
L3_L4 2:47 Y A 0
1:48 1:48 LACP L2 1:46 - R 0
L2 1:48 Y A 0
L2 2:48 Y A 0
========================================================================

Need to know what can be the cause and solution for the issue.

Customer says the services are not affected due to this, but my suspection is that some traffic is tweaked affecting peak utilization to 100% but only on 1 port.

[Saurabh_Makkar]

Hello Nick

There are 2 scenarios here

1st scenario -
Switch to Router
L3-L4 is working

2nd Scenario
Switch to Switch
L2-L2 <>

in both these scenario's in 1 port only i'm getting 100% Peak TX

[Mrxlazuardin]

Hi Saurabh,

You can use a kind of flow analyzer or at least TCPDump/WireShark for inspecting your traffic. You cannot rely only on counter on such burst.

Best regards,

[Saurabh_Makkar]

Hello Mrxlazuardin.

I've applied, but it comes in fraction of seconds so its difficult to check.
Lets see if things change after applying L3_L4

Thank you

regard
Saurabh

[Mrxlazuardin]

Hi Saurabh,

It depends on the combination of MAC, IP and TCP/UDP ports of mostly traffic. You still have to inspect the traffic first. Anyway you can try L3+L4 algorithm too for finding if it can give better hash result.

Best regards,