Xen users - Jan 2012 - Issue while adding new host to Pool having VLANs on Bonded network

Hi,

Today I was adding a new host to my Pool and found this strange issue.

Background info:
Pool has 3 hosts running fine from past 2 months.
Each host has 6NICs NIC0, Bond(1+2), Bond(3+4), NIC5
5 VLANs are created on Bond(3+4) and 2 VLANs on NIC5

Action:
Installed new similar host, configured only its management interface NIC0.
Added this host to existing pool.

Result:
The new host joined the Pool and created Networks automatically.

Problem:
All networks were created successfully but the VLAN networks of Bond(3+4)
were broken.
VMs having VLAN on NIC5 were able to migrate to new host but VMs having
VLAN on Bond(3+4) were not able to migrate.
The error was "Cannot see required network"

So, I think my pool is having issue in creating vlan of bonded networks on
new joining host.

Solution:
I detached all the VIFs of bonded vlans. Then deleted the VLAN networks
which were on Bond(3+4).
Recreated the same VLANs on same bond again for pool and it was successful.
I can now migrate any VM (with VLAN) to new host.

XCP version is 1.1(50674), can someone help me understanding this.

Thanks,
R J