How to change LACP timer-value on Windows server 2012, from short to long?

[ditti.tech]

Hi,

How to change LACP timer-value on Windows server 2012, from short to long?

Regards

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2 nexus nexus5k in VPC dmain and Single-Homed FEX N2K-C2248TP-1GE

Layer 2 requirement— The ISSU process will be aborted if the system has any Link Agregration Control Protocol (LACP) fast timers configured.

# show lacp issu-impact

For ISSU to Proceed, Check the following:

1. All port-channel member port should be in a steady state.

2. LACP rate fast should not be enabled on satellite member ports.

The following ports are not ISSU ready

Eth102/1/1

[ditti.tech]

On linux it's really simple...

lacp_rate=

Specifies the rate at which link partners should transmit LACPDU packets in 802.3ad mode.

Possible values are:

slow or 0 — Default setting. This specifies that partners should transmit LACPDUs every 30 seconds.

fast or 1 — Specifies that partners should transmit LACPDUs every 1 second.

[ditti.tech]

Since Windows 2012 Server, Microsoft natively integrated the Load Balancing/Failover (LBFO) into the operating system.

Unfortunately, in an "802.3ad" configuration, the LBFO is fixed at Short Timeout (every 1 sec) and it cannot be changed.
As a consequence, we have an incompatibility with our Cisco Nexus 5000 to perform an In Service Software Upgrade (ISSU) because we need to negotiate a Long Timeout (every 30 sec).
To work around this problem, we passed by the new version of the Broadcom BACS or Intel ANS with latest drivers and not use the MS LBFO.

[ditti.tech]

http://www.microsoft.com/en-us/download/details.aspx?id=40319

Extract page 8

Windows NIC Teaming always operates in LACPs Active mode with a short timer.  No option is presently available to modify the timer or change the LACP mode.

[mkoch · Accepted solution]

MicroSoft has release a patch to enable slow LACP PDUs.

see https://support.microsoft.com/en-us/kb/3109099

[ditti.tech]

Thank you for your reply.

Regards