Re: [Xen-users] Network Problem after DomU migration

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

ml ml wrote:

> i have two nodes on two switches. When i do a live migration then my
> DomU is not reachable anymore.
> If i start a ping manually from the DomU console, then its reachable
> again. Looks like i need to create traffic so that the Dom0 Network
> Stack knows that there is now a DomU running :)
>
> By "reachable" i mean icmp pings to that IP Address.
More likely it's a MAC table caching issue. Each switch (and that 
includes the virtual switch (bridge) in your Dom0) caches the 
MAC-port mappings required to forward packets. When you move a 
device, then the table need to update.
Generating traffic from the DomU will generally cause the switches to 
update their tables - though some seem to take longer than others, 
I've seen HP switches take 5 minutes to expire the old mappings.
--
Simon Hobson

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