Possible LACP problem with FreeBSD 10.2-RELEASE and Juniper MX5

Thu, 10 Sep 2015 08:34:06 -0700 

Hi All,

We have a router configured with 2 LACP (lagg0 and lagg1):

lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO>
        ether 00:1b:21:7b:ee:98
        inet6 fe80::21b:21ff:fe7b:ee98%lagg0 prefixlen 64 scopeid 0x12
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        laggproto lacp lagghash l2,l3,l4
        laggport: igb6 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        laggport: igb7 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>

lagg1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO>
        ether 00:1b:21:7b:ee:6c
        inet 189.xxx.xxx.34 netmask 0xfffffffc broadcast 189.113.78.35
        inet6 fe80::21b:21ff:fe7b:ee6c%lagg1 prefixlen 64 scopeid 0xf
        inet6 2804:56c:0:8::2 prefixlen 64
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        laggproto lacp lagghash l2,l3,l4
        laggport: igb4 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        laggport: igb5 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
When my Internet traffic is high at night, my BGP session in lagg1 is giving up and down 4 in 4 minutes. After upgraded to FreeBSD 2.10-RELEASE-p2, this problem started. Before we were using the FreeBSD 10.1-STABLE r281235 without any problem. 

The log have the following messages:
/var/log/messages:Sep 9 19:21:43 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:21:44 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:27:01 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:27:01 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:29:13 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:29:14 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:46:10 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 19:46:11 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:01:02 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:01:03 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:02:08 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:02:09 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:03:54 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:03:57 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:07:05 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:07:06 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:20:49 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:20:50 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:25:39 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:25:40 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:28:55 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:28:56 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:31:39 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:31:39 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:33:29 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 20:33:30 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:03:38 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:03:38 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:09:39 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:09:39 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:20:51 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:20:52 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:25:24 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:25:25 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:36:22 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:36:23 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:39:26 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:39:27 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:47:40 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:47:40 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:52:19 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:52:19 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:53:01 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:53:01 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:58:53 rt01 kernel: igb5: Interface stopped DISTRIBUTING, possible flapping /var/log/messages:Sep 9 21:58:53 rt01 kernel: igb4: Interface stopped DISTRIBUTING, possible flapping
Has there been any change in the LACP, during this period, which could be causing this problem? 
I'm doing a downgrade in our system to see if this problem happen tonight.

Thanks and best regards,

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