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Bronze

"lacp rate fast" in Catalyst 3750?

I am running the latest version of 12.2(55)SE6 on the catalyst and I am looking for this command "lacp rate fast" but it is not there:

lab-c3750#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

lab-c3750(config)#interface g1/0/5

lab-c3750(config-if)#lacp ?

  port-priority  LACP priority on this interface

lab-c3750(config-if)#lacp

According to this link, it is supposed to work: https://supportforums.cisco.com/thread/2169447

Am I missing something?

6 REPLIES
VIP Super Bronze

"lacp rate fast" in Catalyst 3750?

Hi,

This command is only supported on the 6500 series and not 3750 series.

http://www.cisco.com/en/US/docs/ios-xml/ios/interface/command/ir-l1.html#GUID-AA3360DE-6519-4A97-A73A-1301DF0A9FF7

HTH

Bronze

"lacp rate fast" in Catalyst 3750?

Then what is the "default" lacp rate on the 3750 then?

Thanks,

New Member

I realize this thread is 3

I realize this thread is 3 years old, however I had this same issue, and hope this information will help somebody else.

The 3750 only supports slow LACP. The rate for this is every 30 seconds.

The 6500 series will support a "Fast" or 1 second LACP rate.

VIP Purple

As of 15.2 the Cisco 3750-X

As of 15.2(4)E the Cisco 3750-X now supports lacp rate fast.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-2_4_e/releasenotes/rn-1524e-3750x3560x.html

LACP Enhancements (LACP rate fast, min links, LACP over QinQ (L2PT LACP))

LACP - New enhancements like LACP rate fast, min links, LACP over QinQ (L2PT LACP) are added.

Bronze

The lacp rate fast command is

The lacp rate fast command is definitely supported in 15.2(4)E4, however during testing I still see it taking 10-15 seconds for the bundle to form.  This is with a Palo Alto firewall

LACP with Palo Alto Firewalls

Cisco Employee

Re: The lacp rate fast command is

In fact, "lacp rate" defines only the rate at which control packets are sent by the Link Aggregation Control Protocol (LACP) - that's all. The time needed for bundle to reach IN_SYNC state has almost no dependecny on "lacp rate". LACP_Timeout for example will be a function of "lacp rate"- this makes a significant difference for ND-ISSU on Nexus5K/6K platforms...

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