Messages in this thread |  | | Date | Mon, 29 Oct 2001 20:55:36 -0800 (PST) | From | Dan Hollis <> | Subject | Re: Ethernet NIC dual homing |
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On Mon, 29 Oct 2001, Jonathan Lundell wrote: > At 6:33 PM -0800 10/29/01, Dan Hollis wrote: > >On Mon, 29 Oct 2001, Christopher Friesen wrote: > >> Are there issues with using MII to detect link state? I thought > >>it was fairly > >> reliable... > >It doesn't work to detect link state through bridging device (say, bridged > >ethernet over T3). The T3 might go down, but your MII link to the local > >router will remain "up", so you will never know about the loss of link and > >your packets will happily go into the void... > ARP isn't going to do much for you once the failure is beyond the > local segment, is it?
But you can use it to determine end-to-end link status. MII is useless for that when you're going through a bridge.
So ARP is *perfect* for this situation and is *exactly* what is needed. When you determine link is down using end-to-end status like ARP then you can take the device out of the bonding queue. Presto, 100% perfect failover.
-Dan -- [-] Omae no subete no kichi wa ore no mono da. [-]
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