This has moved on since the bug was reported and the latest version of libvirt (0.8.8) manages a single ipv6 prefix for each bridge with a separate radvd process for every bridge - but as yet is short of options for IPv6 DNS or DNS search lists.
As it stands though radvd is extremely static as an IPv6 router advertiser. It may needs some thought by the server team at a UDS as to whether radvd needs some work to support more dynamic IPv6 setups.
This has moved on since the bug was reported and the latest version of libvirt (0.8.8) manages a single ipv6 prefix for each bridge with a separate radvd process for every bridge - but as yet is short of options for IPv6 DNS or DNS search lists.
As it stands though radvd is extremely static as an IPv6 router advertiser. It may needs some thought by the server team at a UDS as to whether radvd needs some work to support more dynamic IPv6 setups.