lacp lagg port flags do not show correctly resulting in poor traffic distribution/performance

[Adarsh Joshi]

Hi,

I am trying to configure lacp lagg interfaces with 2 systems connected back to back as follows:

Ifconfig lagg0 create
Ifconfig lagg0 laggproto lacp laggport ql0 laggport ql1 192.168.100.1 netmask 255.255.255.0

Sometimes, the lag interface comes up correctly but sometimes the laggport flags do not show properly. Instead of 1c<ACTIVE,COLLECTING,DISTRIBUTING>, it shows values of 18. I have seen similar issues reported on various forums with no solution.
Looking at the lagg driver code and reading the standard, I thought the laggport flags ( defined in if_lagg.h) are based on the LACP_STATE_BITS in file ieee8023ad_lacp.h. But the following ifconfig -v output does not make any sense to me.

My concern is that when all the interfaces show flags as 1c, the traffic is distributed across both the interfaces uniformly and I get aggregated throughput. If not, the traffic flows only on 1 interface.

Is this a bug? How do I solve this? Or am I doing something wrong?

I am using Free-BSD 9.0 release.

System 1:
# ifconfig -v lagg0
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=13b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,TSO4>
        ether 00:0e:1e:08:05:20
        inet 192.168.100.1 netmask 0xffffff00 broadcast 192.168.100.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        groups: lagg
        laggproto lacp
        lag id: [(8000,00-0E-1E-08-05-20,0213,0000,0000),
                 (8000,00-0E-1E-04-2C-F0,0213,0000,0000)]
        laggport: ql1 flags=18<COLLECTING,DISTRIBUTING> state=7D
                [(8000,00-0E-1E-08-05-20,0213,8000,000F),
                 (FFFF,00-00-00-00-00-00,0000,FFFF,0000)]
        laggport: ql0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> state=3D
                [(8000,00-0E-1E-08-05-20,0213,8000,000E),
                 (8000,00-0E-1E-04-2C-F0,0213,8000,000E)]

System 2:

# ifconfig -v lagg0
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=13b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,TSO4>
        ether 00:0e:1e:04:2c:f0
        inet 192.168.100.2 netmask 0xffffff00 broadcast 192.168.100.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        groups: lagg
        laggproto lacp
        lag id: [(8000,00-0E-1E-04-2C-F0,0213,0000,0000),
                 (FFFF,00-00-00-00-00-00,0000,0000,0000)]
        laggport: ql1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> state=7D
               [(8000,00-0E-1E-04-2C-F0,0213,8000,000F),
                 (FFFF,00-00-00-00-00-00,0000,FFFF,0000)]
        laggport: ql0 flags=18<COLLECTING,DISTRIBUTING> state=3D
                [(8000,00-0E-1E-04-2C-F0,0213,8000,000E),
                 (8000,00-0E-1E-08-05-20,0213,8000,000E)]


thanks
Adarsh


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