Re: [Xen-users] Problem pinging the xen guest after live migration

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On Wednesday 07 July 2010 17:27:23 Srija G wrote:
> Thank you so much  to both of you John and Matej.
> 
> Yes,  both of your  solution,  worked when I am live migrating the guest
> from one  dom0 to  another dom0.
> 
> What i am doing now,
> 
>   -    In Host-B  , I am executing the command ,
> 
>                  ping  Guest-15a
> 
>    -   In the Host-A   ,  I am executing  the command
> 
>           xm  migrate --live  Guest-15a    Host-B
> 
>  The  result:
> 
>        * Live  migration went  very  well,  found  there is  just  1 sec
> stop in between but I think that is  acceptable.*
> 
> Our network team says  that portfast is already configured at switch .
> 
> But as  the first option  worked , so  I  hope  I can move on  - right?  If
> not please  advice....
> 
> My second question is,  mode=4  , ie  802.2ad ( link  aggregation ) did not
> work still yet. I wanted to
> set  the mode=4 as it is much faster. Found one document  , here is the url
> 
> http://wiki.oracle.com/page/Cisco+Systems+IOS-based+switches-+interface+bon
> ding+and+trunking
> 
> It is very good .  In this  document  , the first line it is mentioned   :
> 
> *****   It is important that the native VLANs *be identical* on both sides
> of the link
> 
> What does it mean  VLANs *be identical* on both sides of the link  ? Sorry
> for the silly question though.
> 
>  Would you please explain , do I need to check /configure anything  on the
> server side?     My configuration is  simple  enough ,
> 
> In my configuration I have used  eth0 and  eth1 bonded  to bond0, and  for
> each subnet,  created  the
> 
> config files,  as   ifcfg-bond0.15, ifcfg-bond0.16,  ifcfg-bond0.17.   Then
> in the /etc/xen/scripts  , I have created
> 
> a custom  file where I mentioned all the bridges  for  each  vlan tag.  And
> this custom file is being called
> 
> from    /etc/xen/xend-config.sxp...
> 
> 
> Please  advice,  do you need to proceed with aggregation link or  with
> mode=1, which is now configured  and
> you all helped me a work around...
> 
> Thanks again.
> 
> On Mon, Jul 5, 2010 at 6:25 AM, John Haxby <john.haxby@xxxxxxxxxx> wrote:
> >  On Sat, 2010-07-03 at 17:57 -0400, Srija G wrote:
> >> Hi ,
> >> [snip]
> >>
> >> Can anyone please advice , where to check?  Do you think it is the
> >> switch configuration issues?
> >
> > It's almost certainly a switch issue: the switch doesn't know that the
> > MAC address for the recently migrated machine is on a different port.
> >
> > There are two possibilities: you can either ping something (eg the
> > default router) _from_ the guest after it has migrated or you can set
> > portfast on the switch.  The former just informs the switch that the
> > originating MAC address is now on a different port; the latter makes the
> > switch less willing to hold on to the MAC address/port association for a
> > long time and is something that the network people can do.  You might
> > want to try doing both.
> >
> > jch
> 

Why don't you use multipathing in stead of bonding? 

B.

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