Do a search on the support site for "peer-gateway" and you'll see a number or articles, but the summary is just this:
Make sure vpc peer-gateway in in the port channel configuration, or the routing might not be what you think it is. You'll have traffic moving asymmetrically, and it can lead to weird ISL saturation situations.
I've been involved in a number of intermittent performance problems that ultimately resulted from this missing setting.
-----Original Message----- From: Ehrenwald, Ian [mailto:Ian.Ehrenwald@hbgusa.com] Sent: Friday, February 03, 2017 2:24 PM To: Steiner, Jeffrey Jeffrey.Steiner@netapp.com; Filip Sneppe filip.sneppe@gmail.com Cc: toasters@teaparty.net Subject: Re: super secret flags
Would you be able to share those odd special settings to make vPCs play nice with LACP and NetApp filers? Our datacenter sites have 2 x Nexus 5672's with vPCs between them, and the filers directly connected, so I want to run this by our network team to see if we're missing anything. AFAIK we have not seen any issues that would be a result of LACP problems, but I'm a curious cat.
Ian Ehrenwald Senior Infrastructure Engineer Hachette Book Group, Inc. 1.617.263.1948 / ian.ehrenwald@hbgusa.com
________________________________________ From: toasters-bounces@teaparty.net toasters-bounces@teaparty.net on behalf of Steiner, Jeffrey Jeffrey.Steiner@netapp.com Sent: Friday, February 3, 2017 4:34 AM To: Filip Sneppe Cc: toasters@teaparty.net Subject: RE: super secret flags
I almost mentioned that the Cisco 3750 switch was a model where I'd seen problems with port hashing. The 3750 has been around for a while, so it might have improved over time. I've also seen odd problems related to those four SFP ports on the right hand side of the switch.
A Nexus shouldn't have issues, unless vPC's are in use. There are some odd special settings to make vPC's play nice with LACP with some vendors including NetApp, and there have been a few vPC related bugs as well. This may contain confidential material. If you are not an intended recipient, please notify the sender, delete immediately, and understand that no disclosure or reliance on the information herein is permitted. Hachette Book Group may monitor email to and from our network.