[Xen-users] VIFs disappear from bridge - 3.0.3 Debian Etch

[Matt Rubright <Matt.Rubright@xxxxxxxx>]

Hi all,

We've been using Xen 3.0.3-1 on Debian Etch for around 2 years now using 
standard Xen bridging. Over the past few months, we've experienced the periodic 
disappearance of VIF macs from the FDB of the bridge. It seems to happen at 
random, primarily with domUs that typically receive less network traffic. When 
the VIF stops responding, the mac address for it still shows up in the FDB of 
the attached switch and the IP arp table of the router. However, it's missing 
from the output of 'brctl showmac xenbr0'. The only way we've been able to 
recover it is to restart the affected domU. We have no special iptables or 
ebtables configurations in place.

I can't find any reference to similar problems on the list or elsewhere. Below 
is the output of 'xm info', 'brctl show', and 'brctl showmacs xenbr0'. Any help 
would be appreciated.

host                   : xen1-central
release                : 2.6.18-6-xen-686
version                : #1 SMP Fri Dec 12 20:13:49 UTC 2008
machine                : i686
nr_cpus                : 2
nr_nodes               : 1
sockets_per_node       : 1
cores_per_socket       : 2
threads_per_core       : 1
cpu_mhz                : 1800
hw_caps                : 
178bfbff:ebd3fbff:00000000:00000010:00002001:00000000:0000001f
total_memory           : 2046
free_memory            : 512
xen_major              : 3
xen_minor              : 0
xen_extra              : .3-1
xen_caps               : xen-3.0-x86_32p
xen_pagesize           : 4096
platform_params        : virt_start=0xf5800000
xen_changeset          : Tue Oct 17 22:09:52 2006 +0100 
cc_compiler            : gcc version 3.4.6 (Debian 3.4.6-5)
cc_compile_by          : skx
cc_compile_domain      : debian.org
cc_compile_date        : Tue Oct 23 02:22:48 BST 2007
xend_config_format     : 2

'brctl show'

bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif0.0
                                                        peth0
                                                        vif29.0
                                                        vif27.0
                                                        vif25.0
                                                        vif22.0
                                                        vif24.0
                                                        vif28.0
'brctl showmacs xenbr0'

port no mac addr                is local?       ageing timer
  2     00:06:5b:19:c6:c1       no                16.39
  2     00:09:6b:00:9e:51       no                43.60
  2     00:0c:29:5a:d4:cb       no                61.53
  2     00:0c:29:f5:e2:4d       no                15.43
  2     00:0d:60:9d:2f:e6       no                64.61
  2     00:15:e8:32:18:00       no                 4.18
  6     00:16:3e:15:c7:5e       no                58.46
  7     00:16:3e:24:5b:7e       no                13.16
  2     00:16:3e:2e:ee:10       no                71.48
  3     00:16:3e:3a:8f:5b       no                 0.28
  5     00:16:3e:54:4d:2d       no                 0.00
  8     00:16:3e:56:7a:f3       no                25.02
  2     00:16:3e:6e:4c:59       no                31.06
  4     00:16:3e:7d:0c:ae       no                 6.65
  1     00:1a:a0:09:51:36       no                 0.00
  2     00:21:62:f0:00:0a       no                 0.30
  2     00:21:62:f0:72:06       no                 0.00
  2     00:21:62:f1:00:0a       no                 0.20
  2     00:21:62:f1:22:06       no                 0.00
  2     00:30:18:b0:46:fe       no                73.78
  2     00:90:27:2a:77:5a       no               110.57
  2     00:90:27:8a:10:3e       no               240.16
  2     00:d0:b7:25:43:c8       no                61.53
  1     fe:ff:ff:ff:ff:ff       yes                0.00

Thanks,
Matt

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