[Xen-users] question re xen bridging: how would I enable different names for xen bridge and dom0 ethernet interface?

[Benjamin Weaver <benjamin.weaver@xxxxxxxxxxxxx>]

I have a 2-node xen cluster set up on 2 identical Linux Squeeze boxes. 
An ifconfig on one of the boxes is shown below.
The only bridge configuration on our system is this:

(network-script 'network-bridge netdev=eth0')

eth0 shows up as a bridge. A 'brctl showmacs eth0' indicates as much. I 
would expect this, given my network-script line given above.
But eth0 also has an ip associated with it, from dom0. I would also 
expect this too: that eth0 is the logical ethernet interface to dom0, 
given the usual explanations for name substitutions (eth0-> peth0, 
veth0->eth0). A typical explanation is given on 
http://www.sparksupport.com/blog/xen-bridging
As I understand it, xen packet flow can be understood from the 2nd 
diagram on the url I have given. I am pretty sure I understand the usual 
explanation for the name substitutions on dom0. I would like a separate 
name for my xen bridge. I would like to call it by, say, the default 
name often mentioned in xen networking pages like the one above.
3 Questions:
1. Is eth0 in my configuration, both the dom0 logical interface and the 
xen bridge? It would have to be, which I do not understand, since I 
don't think a bridge can be an interface and vice versa.
2. what does the 'netdev' parameter do? as opposed to a network-script 
line like this:
(network-script 'network-bridge bridge=eth0')
3. how would I configure the system so that the dom0 logical ethernet 
interface is named differently from the xen bridge?
3a. how, for example, would I name my bridge xenbr0?




An ifconfig on my system shows the following:
eth1 (connected to a local SAN box),
lo
peth0
vif144.0
vif145.0. (this is a vm that we are continually migrating between the 
nodes in a stress test).




sudo ifconfig
eth0      Link encap:Ethernet  HWaddr 00:15:17:80:3f:c6
          inet addr:163.1.87.47  Bcast:163.1.87.255  Mask:255.255.254.0
          inet6 addr: fe80::215:17ff:fe80:3fc6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:111509205 errors:0 dropped:0 overruns:0 frame:0
          TX packets:34583064 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:112192535136 (104.4 GiB)  TX bytes:130624185882 
(121.6 GiB)
eth1      Link encap:Ethernet  HWaddr 00:15:17:80:3f:c7
          inet addr:192.168.0.41  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::215:17ff:fe80:3fc7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3468487649 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6724806778 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:491142175857 (457.4 GiB)  TX bytes:9728780721480 
(8.8 TiB)
          Memory:fc3a0000-fc3c0000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:90 errors:0 dropped:0 overruns:0 frame:0
          TX packets:90 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6144 (6.0 KiB)  TX bytes:6144 (6.0 KiB)

peth0     Link encap:Ethernet  HWaddr 00:15:17:80:3f:c6
          inet6 addr: fe80::215:17ff:fe80:3fc6/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:6770049434 errors:0 dropped:1942 overruns:0 frame:0
          TX packets:6670969718 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:6995794894068 (6.3 TiB)  TX bytes:6737528247671 (6.1 
TiB)
          Memory:fc3e0000-fc400000

vif144.0  Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:34510490 errors:0 dropped:0 overruns:0 frame:0
          TX packets:66435470 errors:0 dropped:343 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:1998543142 (1.8 GiB)  TX bytes:100382092280 (93.4 GiB)

vif145.0  Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:34 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)


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