Can lagg0 failback be prevented?

[Nikolay Denev]

How long exactly is that "momentary network outage"?
If it's longer than a few (1-5) seconds it may be due to
RSTP or STP enabled on the switch.
You could try disabling STP on these ports and see if it will
start forwarding traffic faster.

--
Regards,
Nikolay Denev




On 16 Sep, 2009, at 03:23 , Peter Steele wrote:

> 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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