So it looks like restarting the LinuxBridge agent isn't enough to initiate the change. The vxlan interfaces will persist a restart of the service, so they must be deleted first, then a restart of a agent will rebuild them:
Before and after restarting the agent:
293: vxlan-48: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue master brq41984be8-05 state UNKNOWN mode DEFAULT group default
link/ether 22:2f:74:e5:51:c3 brd ff:ff:ff:ff:ff:ff promiscuity 1
vxlan id 48 dev br-vxlan port 32768 61000 proxy ageing 300
After deleting/restarting:
955: vxlan-48: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue master brq41984be8-05 state UNKNOWN mode DEFAULT group default
link/ether 52:d9:60:02:f0:fa brd ff:ff:ff:ff:ff:ff promiscuity 1
vxlan id 48 group 239.1.1.1 dev br-vxlan port 32768 61000 ageing 300
This will, of course, cause downtime for connected instances.
So it looks like restarting the LinuxBridge agent isn't enough to initiate the change. The vxlan interfaces will persist a restart of the service, so they must be deleted first, then a restart of a agent will rebuild them:
Before and after restarting the agent:
293: vxlan-48: <BROADCAST, MULTICAST, UP,LOWER_ UP> mtu 1450 qdisc noqueue master brq41984be8-05 state UNKNOWN mode DEFAULT group default
link/ether 22:2f:74:e5:51:c3 brd ff:ff:ff:ff:ff:ff promiscuity 1
vxlan id 48 dev br-vxlan port 32768 61000 proxy ageing 300
After deleting/ restarting:
955: vxlan-48: <BROADCAST, MULTICAST, UP,LOWER_ UP> mtu 1450 qdisc noqueue master brq41984be8-05 state UNKNOWN mode DEFAULT group default
link/ether 52:d9:60:02:f0:fa brd ff:ff:ff:ff:ff:ff promiscuity 1
vxlan id 48 group 239.1.1.1 dev br-vxlan port 32768 61000 ageing 300
This will, of course, cause downtime for connected instances.