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Dell EMC Networking Force10 OS9: Resolving LACP port ungrouping

Summary: This article explains how to resolve LACP port ungrouping due to mismatching LACPDU timers.

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Article Content


Instructions

When creating a LACP Link Aggregation, all Force10 switches (except for the I/O Aggregator) have two transmit timer values. This value determines how often the ports send LACPDUs. The default is one LACPDU sent every 1 second. You can also configure it to send one every 30 s with the lacp long-timeout command. Long-timeout is best practice and recommended for the Force10 switches.

When the LACPDU transmits timer values mismatch, this can cause intermittent ungrouping of ports, thus causing connection issues. The following command and output helps determine how many LACPDUs being sent and received. This example uses LACP 10.

FTOS#clear lacp 10 counters

FTOS#show lacp 10 counters

----------------------------------------------------------------------

              LACP PDU            Marker PDU         Unknown  Illegal

Port     Xmit       Recv       Xmit       Recv       Pkts Rx  Pkts Rx

----------------------------------------------------------------------

Gi 0/1   4560        152        0          0          0        0

Gi 0/3   4560        152        0          0          0        0

As you can see, Xmit represents LACP PDUs sent and Recv is received from the partner device. In this scenario, the Force10 switch is sending LACP PDUs faster than the connecting device. To resolve this, we run the following command to send LACP PDUs every 30 s instead.

FTOS#config

FTOS(conf)#interface po 10

FTOS(conf-if-po-10)#lacp long-timeout

FTOS(conf-if-po-10)#end

FTOS#wr
Note: To remove, type no lacp long-timeout in the port channel interface configuration instead.

Now verify the timers again.

FTOS#clear lacp 10 counters

FTOS#show lacp 10 counters

----------------------------------------------------------------------


              LACP PDU            Marker PDU         Unknown  Illegal


Port     Xmit       Recv       Xmit       Recv       Pkts Rx  Pkts Rx


----------------------------------------------------------------------


Gi 0/1   10        11       0          0          0        0


Gi 0/3   10        11        0          0          0        0

 

The two switches are sending and receiving LACP PDUs at the same speed. Keep in mind that this lacp long-timeout is best practice in Force10 and is recommended.

 

Article Properties


Affected Product
Force10 MXL Blade, Force10 S25N-S50N, Force10 S25-01-GE-24P, Force10 S25-01-GE-24T, Force10 S25-01-GE-24V, Force10 S50-01-GE-48T-V, Force10 S50-01-GE-48T, PowerSwitch S4810P, Force10 S50P, Force10 S55T, Force10 S60-44T, Force10 Z9000 , PowerEdge M IO Aggregator ...
Last Published Date

29 Aug 2023

Version

4

Article Type

How To