[Xen-users] Bonding & xenbr0

[Gerhard Spiegl <gspiegl@xxxxxx>]

Hi List!

This is my first post on this list so let me say hello to all here!

I'm trying to set up HA xen VMs on RHEL 5.2 with Red Hat Cluster Suite.
XEN version used is original Red Hat packaged xen-3.0.3-64.el5_2.1.

Setup is the following:

eth0 + eth1 ==> bond0  (public interface, connected to two core switches with 
one vlan)
eth2  (private interface connected to rack mounted 100Mbit switch for cluster 
interconnect)
      (this will be eth2 + eth3 ==> bond1 in future)

The xen network is working fine after adding "netdev=bond0" to the 
(network-script ...) line
in xend-config.sxp - no other changes were made.

But: Yesterday the network administrator complained about error messages in the
switch logs caused by multiple interfaces having MAC address FE:FF:FF:FF:FF:FF 
since
XEN was set up.
The only public interface with a configured IP is bond0 with the MAC of 
enslaved eth0
so why is this strange MAC (FE:FF..) seen on the switch? We are also wondering 
why
eth0 and eth1 do have this MAC. Is there an issue with bonding and xen bridging?

Output of ifconfig is attached, if you need more information, please let me 
know.

I would be pleased if anyone could point me to a right direction - google 
didn't help.

regards
Gerhard



ifconfig output:
[root@ols011 ~]# ifconfig -a | egrep -A1 '^[^ ]'
bond0     Link encap:Ethernet  HWaddr 00:14:4F:78:97:1C
          inet addr:172.27.100.121  Bcast:172.27.111.255  Mask:255.255.240.0
--
bond1     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MASTER MULTICAST  MTU:1500  Metric:1
--
eth0      Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
--
eth1      Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
--
eth2      Link encap:Ethernet  HWaddr 00:14:4F:78:97:1E
          inet addr:10.10.10.1  Bcast:10.10.10.3  Mask:255.255.255.252
--
eth3      Link encap:Ethernet  HWaddr 00:14:4F:78:97:1F
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
pbond0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
--
veth1     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
veth2     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
veth3     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
--
vif0.1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
vif0.2    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
vif0.3    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          BROADCAST MULTICAST  MTU:1500  Metric:1
--
vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST NOARP  MTU:1500  Metric:1
--
xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link

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