Date: Tue, 15 Sep 2009 19:23:29 -0500 From: Peter Steele <psteele@maxiscale.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Can lagg0 failback be prevented? Message-ID: <7B9397B189EB6E46A5EE7B4C8A4BB7CB3042DBE7@MBX03.exg5.exghost.com>
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We're using the lag driver to provide automatic failover in case of a network outage. The default configuration looks like this:
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
ether 00:a0:d1:e3:58:26
inet 192.168.17.40 netmask 0xfffff000 broadcast 192.168.31.255
inet 192.168.22.11 netmask 0xffffff00 broadcast 192.168.22.255
media: Ethernet autoselect
status: active
laggproto failover
laggport: nfe1 flags=0<>
laggport: nfe0 flags=5<MASTER,ACTIVE>
If nfe0 was to fail, we get an (almost) automatic failover to nfe1:
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
ether 00:a0:d1:e3:58:26
inet 192.168.17.40 netmask 0xfffff000 broadcast 192.168.31.255
inet 192.168.22.11 netmask 0xffffff00 broadcast 192.168.22.255
media: Ethernet autoselect
status: active
laggproto failover
laggport: nfe1 flags=4<ACTIVE>
laggport: nfe0 flags=1<MASTER>
The problem we're having is when nfe0 comes online again, a failback occurs making nfe0 active again. This causes a momentary network outage that we want to prevent. Is there a way to configure the lagg device to stay with the currently active interface, even if the MASTER interface comes back online?
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