I have restarted the service with no apparent changes, so I took the big
leap and rebooted the Dom0 server. When it came up I still could not
see the additional bridged eth1. 
[root@testvs ~]# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 no
xenbr0 8000.feffffffffff no peth0
 vif0.0
Here is the contents of my xend-config.sxp file:
[root@testvs ~]# grep -v ^# /etc/xen/xend-config.sxp
(xend-unix-server yes)
(xend-unix-path /var/lib/xend/xend-socket)
(xend-relocation-hosts-allow '^localhost$ ^localhost\\.localdomain$')
(network-script network-bridge)
(network-script my-network-bridge)
(vif-script vif-bridge)
(dom0-min-mem 256)
(dom0-cpus 0)
(vncpasswd '') 
Here is my wrapper script:
[root@testvs ~]# cat /etc/xen/my-network-bridge
#!/bin/sh
dir=$(dirname "0ドル")
"$dir/network-bridge" "0ドル" vifnum=0 netdev=eth0 bridge=xenbr0
"$dir/network-bridge" "0ドル" vifnum=1 netdev=eth1 bridge=xenbr1
bridge=xenbr1
Here are what my system thinks it has for network interfaces:
[root@testvs ~]# ifconfig -a |grep Link
eth0 Link encap:Ethernet HWaddr 00:1B:78:B5:45:4F
 inet6 addr: fe80::21b:78ff:feb5:454f/64 Scope:Link
eth1 Link encap:Ethernet HWaddr 00:50:BA:7D:6A:28
 inet6 addr: fe80::250:baff:fe7d:6a28/64 Scope:Link
lo Link encap:Local Loopback
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
 inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
sit0 Link encap:IPv6-in-IPv4
veth1 Link encap:Ethernet HWaddr 00:00:00:00:00:00
veth2 Link encap:Ethernet HWaddr 00:00:00:00:00:00
veth3 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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
vif0.2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
vif0.3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
 inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
 inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rainer
Sokoll
Sent: Monday, April 21, 2008 4:15 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] RE: adding a second NIC
On Mon, Apr 21, 2008 at 03:57:39PM -0500, joel.coopersmith@xxxxxxxxxxxxx
wrote:
> Do I need to restart the xend service to make those changes take
affect?
Yes, it is the easiest way.
> How will I see those changes to know they are working?
brctl show
> Then I assume to add them to each guest I modify the 
> /etc/xen/guestname file by replacing the old vif info with the new
device?
With the new bridge, to be correct.
> I see there is
> a MAC address in this same /etc/xen/guestname file that does not seem 
> to correspond to anything in an ifconfig -a. I am confused as to 
> where this MAC comes from.
The MAC in the guest's config sets the guests's MAC, so you have to run
ifconfig in the corresponding domU.
Rainer
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