[Xen-users] Multiple bridges on same subnet?

[Steve Arntzen <xen@xxxxxxxxxx>]

I am running multiple DomUs on the same subnet and wanted to spread the
load over multiple network interfaces.  In addition, the system has
other DomUs with interfaces (bridges) on other subnets.  The NICs and
bridges do not have any IPs on the Dom0, only in the DomUs.

If I run two DomUs with separate bridges (server1 - br1/eth1 and server2
- br2/eth2) on the same subnet, everything runs fine for a while (up to
24 hours) and suddenly, all bridge traffic stops.  Even bridge traffic
on other DomUs on separate networks stops.  Nothing is logged by the
Dom0 or any of the DomUs.  All interface configurations and routing
tables look fine.  Shutting down the DomUs, restarting networking and
restarting the DomUs clears the problem.

The Dom0 which has its own interface (eth0) always works.

Should I not be running multiple bridges on the same subnet or am I
missing some network configuration?

If I share one bridge with multiple DomUs, all works well even under
heavy load.  The network however, is a bottleneck.

Platform:
Sun x4140, dual hex core AMD64
Debian 5.0.4  (kernel 2.6.26-2-xen-amd64)
Xen 3.2-1-amd64

# The first bridge
        auto br1
        iface br1 inet manual
        bridge_ports eth1
        bridge_stp off
        bridge_maxwait 5

# The second bridge
        auto br2
        iface br2 inet manual
        bridge_ports eth2
        bridge_stp off
        bridge_maxwait 5

First DomU:
vif = [ 'bridge=br1' ]

Second DomU:
vif = [ 'bridge=br2' ]


Thanks in advance,

Steve.




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