RE: [Xen-devel] Stimulating domains to send gratuitous ARPs

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>]

> Well, the bonding module itself doesn't track this at all actually; when
> a failover is done, it sends gratuitous ARPs for the following:
> 1. The IP address associated with the bond itself
> 2. The IP addresses associated with an VLANs above the bond (suitably
> encapsulated in the VLAN header).

The Linux bond module isn't well suited to the L2 bridged case anyway. To get 
the effect you want I think you'll have to add MAC addr tracking anyhow.

> In addition, I donât think that 'any old frame' will work -- it needs to
> be a link-level broadcast frame to ensure that all the switches update
> their forwarding tables 

Sure, it needs to be a link-layer broadcast, but it doesn't particularly even 
need to be a valid IP/ARP packet. Broadcast arp reply works as well as 
anything, and has the additional benefit of also helping folk who do happen to 
be using a routed rather than L2 setup.

Best,
Ian

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