netdev - Re: Issue with LACP mode support in Linux bonding driver

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Date:	Thu, 25 Jun 2015 20:07:39 -0700
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	Ajith Adapa <adapa.ajith@...il.com>
Cc:	linux-netdev <netdev@...r.kernel.org>
Subject: Re: Issue with LACP mode support in Linux bonding driver

On Wed, Jun 24, 2015 at 2:55 AM, Ajith Adapa <adapa.ajith@...il.com> wrote:
> Hi,
>
> I am using Centos7 with v3.10 kernel.
>
You are using a very old kernel. Have you tried it with the latest kernel?

> My issue is related to multiaggregation in LACP.
>
> In my setup topology I connected linux server and a L2 switch back to
> back with 2 interfaces eth0 and eth1 (on both sides).
>
> On Switch I have mapped eth0 to po1 and eth1 to po2. On linux server I
> have created a single bond interface with both interfaces eth0 and
> eth1.
>
> On L2 switch both po1 and po2 has same system-id but the Actor key is
> different i.e. on PO1 it is 16385 and on PO2 it is 32768. As per the
> information available about bond0 on linux server which is given below
> Active aggregator ID is 1 which is mapped to eth0 but eth1.
>
> But we have observed that eth1 on linux server is also sending LACPDUS
> with Collecting/Distributing bit set as 1. Which will result in single
> bond interface on Linux server is splitted into multiple port-channels
> on Switch causing duplication of frames on linux server.
>
what happens if you do link-down/up on the nic that is not part of the bond?

> As per IEEE 802.3ad 2003 standard portchannel should not support
> multi-aggregation.
>
>
> #  cat /proc/net/bonding/bond0
> Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
>
> Bonding Mode: IEEE 802.3ad Dynamic link aggregation
> Transmit Hash Policy: layer2 (0)
> MII Status: up
> MII Polling Interval (ms): 100
> Up Delay (ms): 0
> Down Delay (ms): 0
>
> 802.3ad info
> LACP rate: fast
> Min links: 0
> Aggregator selection policy (ad_select): stable
> Active Aggregator Info:
>     Aggregator ID: 1
>     Number of ports: 1
>     Actor Key: 17
>     Partner Key: 16385
>     Partner Mac Address: 11:11:22:22:33:33
>
> Slave Interface: eth0
> MII Status: up
> Speed: 1000 Mbps
> Duplex: full
> Link Failure Count: 0
> Permanent HW addr: 08:00:27:18:ae:4b
> Aggregator ID: 1
> Slave queue ID: 0
>
> Slave Interface: eth1
> MII Status: up
> Speed: 1000 Mbps
> Duplex: full
> Link Failure Count: 0
> Permanent HW addr: 08:00:27:76:35:a2
> Aggregator ID: 3
> Slave queue ID: 0
>
>
> Regards,
> Ajith
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