diff --git a/libvirt-0.6.3-bring-up-ipless-bridge.patch b/libvirt-0.6.3-bring-up-ipless-bridge.patch
new file mode 100644
index 0000000..3b8d3d2
--- /dev/null
+++ b/libvirt-0.6.3-bring-up-ipless-bridge.patch
@@ -0,0 +1,48 @@
+From 4db7474b0c1907e877d7206edeb4d73962971096 Mon Sep 17 00:00:00 2001
+From: Daniel Veillard <veillard@redhat.com>
+Date: Tue, 12 May 2009 15:31:22 +0000
+Subject: [PATCH 1/1] * src/network_driver.c: enable bridges which are not up
+   without an IP address, patch by Ludwig Nussel
+ Daniel
+
+---
+ src/network_driver.c |    9 +++------
+ 1 files changed, 3 insertions(+), 6 deletions(-)
+
+diff --git a/src/network_driver.c b/src/network_driver.c
+index a17a769..a163b15 100644
+--- a/src/network_driver.c
++++ b/src/network_driver.c
+@@ -836,8 +836,7 @@ static int networkStartNetworkDaemon(virConnectPtr conn,
+         goto err_delbr;
+     }
+ 
+-    if (network->def->ipAddress &&
+-        (err = brSetInterfaceUp(driver->brctl, network->def->bridge, 1))) {
++    if ((err = brSetInterfaceUp(driver->brctl, network->def->bridge, 1))) {
+         virReportSystemError(conn, err,
+                              _("failed to bring the bridge '%s' up"),
+                              network->def->bridge);
+@@ -878,8 +877,7 @@ static int networkStartNetworkDaemon(virConnectPtr conn,
+     networkRemoveIptablesRules(driver, network);
+ 
+  err_delbr1:
+-    if (network->def->ipAddress &&
+-        (err = brSetInterfaceUp(driver->brctl, network->def->bridge, 0))) {
++    if ((err = brSetInterfaceUp(driver->brctl, network->def->bridge, 0))) {
+         char ebuf[1024];
+         networkLog(NETWORK_WARN, _("Failed to bring down bridge '%s' : %s\n"),
+                  network->def->bridge, virStrerror(err, ebuf, sizeof ebuf));
+@@ -920,8 +918,7 @@ static int networkShutdownNetworkDaemon(virConnectPtr conn,
+     networkRemoveIptablesRules(driver, network);
+ 
+     char ebuf[1024];
+-    if (network->def->ipAddress &&
+-        (err = brSetInterfaceUp(driver->brctl, network->def->bridge, 0))) {
++    if ((err = brSetInterfaceUp(driver->brctl, network->def->bridge, 0))) {
+         networkLog(NETWORK_WARN, _("Failed to bring down bridge '%s' : %s\n"),
+                  network->def->bridge, virStrerror(err, ebuf, sizeof ebuf));
+     }
+-- 
+1.6.0.6
+
diff --git a/libvirt.spec b/libvirt.spec
index 5a254cd..9215ca4 100644
--- a/libvirt.spec
+++ b/libvirt.spec
@@ -55,7 +55,7 @@
 Summary: Library providing a simple API virtualization
 Name: libvirt
 Version: 0.6.3
-Release: 10%{?dist}%{?extra_release}
+Release: 11%{?dist}%{?extra_release}
 License: LGPLv2+
 Group: Development/Libraries
 Source: libvirt-%{version}.tar.gz
@@ -79,6 +79,8 @@ Patch7: libvirt-0.6.3-xml-attribute-escaping.patch
 # Fix serious event handling issues causing guests to be destroyed (bz 499698)
 Patch8: libvirt-0.6.3-event-handling-1.patch
 Patch9: libvirt-0.6.3-event-handling-2.patch
+# Bring up the bridge, even if it doesn't have an IP address (bz 501912)
+Patch10: libvirt-0.6.3-bring-up-ipless-bridge.patch
 
 # Patches not for upstream.
 
@@ -243,6 +245,7 @@ of recent versions of Linux (and other OSes).
 %patch7 -p1
 %patch8 -p1
 %patch9 -p1
+%patch10 -p1
 
 %patch200 -p0
 
@@ -573,6 +576,9 @@ fi
 %endif
 
 %changelog
+* Mon May 25 2009 Mark McLoughlin <markmc@redhat.com> - 0.6.3-11.fc12
+- Bring up the bridge, even if it doesn't have an IP address (bug #501912)
+
 * Thu May 21 2009 Mark McLoughlin <markmc@redhat.com> - 0.6.3-10.fc12
 - Fix XML attribute escaping (bug #499791)
 - Fix serious event handling issues causing guests to be destroyed (bug #499698)