Xen users - Aug 2009 - VIFs disappear from bridge - 3.0.3 Debian Etch

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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