Hi, we have a very strange problem. We have a HP C7000 blade enclosure with ProLiant BL460c G6 blades within. Each blade has 8 cores, 32GB of memory and 2 network cards, connected trough two ethernet passtrough modules into a Cisco Catalyst 3750G series. On the blades, we have OpenSuSE 11.2 x86_64 with stock xen kernel. The problem: random, when we start or stop a virtual machine, the dom0 network connection hangs. Dom0 doesn''t respond to ping or anything else. After some time (about a minute), the network connection works again, without us doing something special. We manage to connect trough the blade management module on the machine when the network connection does not work and found out that if we remove the gateway arp entry from the arp table (using ip neigh del), the network connection starts working right away. Did anyone found this problem too ? What can be the cause of this ? -- ====================================Manuel SUBREDU Network Engineer at AARNIEC/RoEduNet RoCSIRT Coordinator mobile: +40 (758) 808 052 phone: +40 (232) 201 007 fax: +40 (232) 201 200 e-mail: manuel.subredu@roedu.net ==================================== _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Mon, Mar 15, 2010 at 3:15 PM, Manuel SUBREDU <manuel.subredu@roedu.net> wrote:> Each blade has 8 cores, 32GB of memory > and 2 network cards, connected trough two ethernet passtrough modules > into a Cisco Catalyst 3750G series.> The problem: random, when we start or stop a virtual machine, the dom0 > network connection hangs. Dom0 doesn''t respond to ping or anything else.I''m guessing it has to do with spanning tree (portfast) setting on your switch. Try changing you current setting. When functioning as Xen dom0, the server will behave (networking-wise) more like a switch instead of a single host, so some adjustments might be required on your uplink switches. Set it the same way you would if its connected to another switch. -- Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
The switch ports are already configured with portfast. On 03/15/2010 10:29 AM, Fajar A. Nugraha wrote:>> The problem: random, when we start or stop a virtual machine, the dom0 >> network connection hangs. Dom0 doesn''t respond to ping or anything else. > > I''m guessing it has to do with spanning tree (portfast) setting on > your switch. Try changing you current setting. > > When functioning as Xen dom0, the server will behave (networking-wise) > more like a switch instead of a single host, so some adjustments might > be required on your uplink switches. Set it the same way you would if > its connected to another switch. >-- ====================================Manuel SUBREDU Network Engineer at AARNIEC/RoEduNet RoCSIRT Coordinator mobile: +40 (758) 808 052 phone: +40 (232) 201 007 fax: +40 (232) 201 200 e-mail: manuel.subredu@roedu.net ==================================== _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Did you check the bridge on Dom0 and make sure STP is off on that bridge? On 3/15/2010 3:25 AM, Manuel SUBREDU wrote:> The switch ports are already configured with portfast. > > On 03/15/2010 10:29 AM, Fajar A. Nugraha wrote: > >>> The problem: random, when we start or stop a virtual machine, the dom0 >>> network connection hangs. Dom0 doesn''t respond to ping or anything else. >>> >> I''m guessing it has to do with spanning tree (portfast) setting on >> your switch. Try changing you current setting. >> >> When functioning as Xen dom0, the server will behave (networking-wise) >> more like a switch instead of a single host, so some adjustments might >> be required on your uplink switches. Set it the same way you would if >> its connected to another switch. >> >> >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Manuel, Am Montag, den 15.03.2010, 10:15 +0200 schrieb Manuel SUBREDU:> Hi, > > we have a very strange problem. We have a HP C7000 blade enclosure with > ProLiant BL460c G6 blades within. Each blade has 8 cores, 32GB of memory > and 2 network cards, connected trough two ethernet passtrough modules > into a Cisco Catalyst 3750G series. On the blades, we have OpenSuSE 11.2 > x86_64 with stock xen kernel. > The problem: random, when we start or stop a virtual machine, the dom0 > network connection hangs. Dom0 doesn''t respond to ping or anything else. > After some time (about a minute), the network connection works again, > without us doing something special. > We manage to connect trough the blade management module on the machine > when the network connection does not work and found out that if we > remove the gateway arp entry from the arp table (using ip neigh del), > the network connection starts working right away. > Did anyone found this problem too ? What can be the cause of this ?i would guess Port-Security is enabled on these Ports and your running XEN in Bridged-Mode? # show port-security address Port-Security records the MACs and only accepts packets from the first device that communicates on this switch port, and shutting down that switch port if another MAC address attempts to communicate via the port. Disable PortSecurity on these Ports... # no switchport port-security hth, Thomas> > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users