diff --git a/contrib/ci/pre_test_hook.sh b/contrib/ci/pre_test_hook.sh
index ec00e1fdfe..224a29a30b 100755
--- a/contrib/ci/pre_test_hook.sh
+++ b/contrib/ci/pre_test_hook.sh
@@ -194,6 +194,7 @@ if [[ "$MANILA_SETUP_IPV6" == True ]]; then
     # regular Neutron DevStack configuration.
     echo "NEUTRON_CREATE_INITIAL_NETWORKS=False" >> $localconf
     echo "IP_VERSION=4+6" >> $localconf
+    echo "MANILA_RESTORE_IPV6_DEFAULT_ROUTE=False" >> $localconf
 fi
 
 if [[ "$DRIVER" == "generic"* ]]; then
diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index 6ef6451128..73d069e7c1 100755
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -1013,8 +1013,12 @@ function install_libraries {
 
 function setup_ipv6 {
 
-    # save IPv6 default route to add back later after enabling forwarding
-    local default_route=$(ip -6 route | grep default | cut -d ' ' -f1,2,3,4,5)
+    # This will fail with multiple default routes and is not needed in CI
+    # but may be useful when developing with devstack locally
+    if [ $(trueorfalse False MANILA_RESTORE_IPV6_DEFAULT_ROUTE) == True ]; then
+        # save IPv6 default route to add back later after enabling forwarding
+        local default_route=$(ip -6 route | grep default | cut -d ' ' -f1,2,3,4,5)
+    fi
 
     # make sure those system values are set
     sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
@@ -1130,11 +1134,15 @@ function setup_ipv6 {
     # log the systemd status
     sudo systemctl status $QUAGGA_SERVICES
 
-    # add default IPv6 route back
-    if ! [[ -z $default_route ]]; then
-        # "replace" should ignore "RTNETLINK answers: File exists"
-        # error if the route wasn't flushed by the bgp setup we did earlier.
-        sudo ip -6 route replace $default_route
+    # This will fail with mutltiple default routes and is not needed in CI
+    # but may be useful when developing with devstack locally
+    if [ $(trueorfalse False MANILA_RESTORE_IPV6_DEFAULT_ROUTE) == True ]; then
+        # add default IPv6 route back
+        if ! [[ -z $default_route ]]; then
+            # "replace" should ignore "RTNETLINK answers: File exists"
+            # error if the route wasn't flushed by the bgp setup we did earlier.
+            sudo ip -6 route replace $default_route
+        fi
     fi
 
 }
diff --git a/devstack/settings b/devstack/settings
index 827da80f40..5d4cb5b017 100644
--- a/devstack/settings
+++ b/devstack/settings
@@ -210,6 +210,7 @@ MANILA_DATA_COPY_CHECK_HASH=${MANILA_DATA_COPY_CHECK_HASH:=True}
 
 # Manila IPv6 Setup flag
 MANILA_SETUP_IPV6=${MANILA_SETUP_IPV6:=False}
+MANILA_RESTORE_IPV6_DEFAULT_ROUTE=${MANILA_RESTORE_IPV6_DEFAULT_ROUTE:=True}
 
 # Enable manila services
 # ----------------------