Re: [Xen-devel] about network live connection during migration

[Daniel Stodden <stodden@xxxxxxxxxx>]

On Sun, 2008-03-09 at 10:50 +0800, tgh wrote:
> hi
>   I try to understand to the mechanism of live migration, and I read the 
> code ,and have some confusion about the network live connection during 
> the migration,could you help me, i read the paper about the live 
> migration,it explaine that in a single switched LAN,host sends 
> unsolicited ARP,and in router case, broadcastARP will not be accecpted 
> ,and migratedOS need to sends to the interfaces in the ARPcache,while in 
> a switched net,migrated OS holds the same MAC address,and network switch 
> could detect the change of location,   i am confused about where the 
> code for all of these , could you give me some more detailed explanation 
> or tell me where the code for these

The unsolicited ARP is generated by the network frontend whenever it is
brought up, as would be the case upon resume. look out for something i
believe is called fake_arp (?) in netfront. This is a very simple
operation, btw.

Unicasting to peers listed in the ARP cache is, to my knowledge, not
performed. I believe the paper just outlines what the alternatives would
look like.

regards,
daniel

-- 
Daniel Stodden
LRR     -      Lehrstuhl fÃr Rechnertechnik und Rechnerorganisation
Institut fÃr Informatik der TU MÃnchen             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B



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