Date: Fri, 17 Jan 2014 10:50:12 +0100 From: "Nagy, Attila" <bra@fsn.hu> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: lagg member interfaces don't come back after cable pull Message-ID: <52D8FCD4.2040900@fsn.hu>
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Hi,
Running stable/9@r260621, multiple (currently two) igb's connected to
multiple Cisco Nexus 2ks, forming an LACP port channel.
If I pull one of the cables from the switch, the port immediately goes
down, and removed from the port channel. Everything works nicely.
When I reconnect the cable, the member interface (igb1) remains down.
On the host side, I see:
igb1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
ether ac:16:2d:9a:18:cd
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect
status: no carrier
igb2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
ether ac:16:2d:9a:18:cd
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
admin: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
ether ac:16:2d:9a:18:cd
inet6 fe80::ae16:2dff:fe9a:18cd%admin prefixlen 64 tentative
scopeid 0x9
inet 172.27.79.74 netmask 0xffffff00 broadcast 172.27.79.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect
status: active
laggproto lacp lagghash l2,l3,l4
laggport: igb2 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb1 flags=0<>
Issuing an ifconfig down and up on igb1 fixes the problem, it gets back
into the port channel.
On the switch side I can see the following:
2014 Jan 17 08:58:11 DP1106-A05-11-N5K %ETH_PORT_CHANNEL-5-PORT_UP:
port-channel6: Ethernet109/1/47 is up
2014 Jan 17 09:20:42 DP1106-A05-11-N5K %ETH_PORT_CHANNEL-5-PORT_DOWN:
port-channel6: Ethernet109/1/47 is down
2014 Jan 17 09:31:52 DP1106-A05-11-N5K %ETH_PORT_CHANNEL-5-PORT_UP:
port-channel6: Ethernet109/1/47 is up
The cable was pulled at 09:20:42 and was reconnected in some seconds.
ifconfig down and up was issued around 09:31:52, which fixed the access.
From what I see it may be just the igb and not really connected to
lagg, but I'm not sure and the machine is far away, so testing is not so
easy.
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