Train Series Release Notes¶
As part of a bug #1715317, MAC ageing was disabled for the intermediate bridge created as part of the hybrid plug mechanism. During the removal of
brctl, this behavior was inadvertently applied to all linux bridges created by os-vif including those used in the linuxbridge driver. As a result this can lead to packet flooding (see bug #1837252) when instances are migrated. This behavior has been reverted so that the default mac ageing is determined by the kernel and is not set when using the os-vif linux bridge plugin.
Prevent Linux Bridge from replying to ARP messages. It should reply only if the target IP address is a local address configured on the incoming interface and it should always use the best local address. See The ARP flux problem for more information.