On Mon, 6 Jun 2005, Colm MacCarthaigh wrote:
> The most reliable way is to migrate the mac-address aswell, as part
> of the resilience. We do this for all of our servers, and we have
> 200ms failover with no problems. Though in our case we're using the
> linux bonding driver.
Slightly different to L3 failover.
For bonding you do want L2 to balance, hence you want a shared MAC.
For L3 failover, your choices are:
- failover the MAC from one port to another
(ie update MAC<->port state in the switch)
- failover the IP
(ie update IP<->MAC state in hosts)
I'd pick the latter: L2 doesnt need to know, gratuitous ARP is very
commonly used and perfectly portable across different OSes and it's
switch agnostic (think: what if the backup port is on a different
Paul Jakma paul at clubi.iepaul at jakma.org Key ID: 64A2FF6A
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