Using a Cisco Switch as the NTP Master time source for a Windows PDC

Hi all,
We have a closed network (no connectivity to the internet) and we have a Core router setup as the NTP Master for the rest of the network.
All network devices are getting the time synced as intended but we are having issues getting the Primary Domain Controller (PDC) registering to it as a valid NTP time source.
The problem we have is that we are affected by IOS bug CSCed13703 which rejects the PDC as an NTP associated device. Short of changing the IOS on the Router which is the main router feeding 30 other sites I would like to point the PDC at a different switch (an NTP Client switch) as it’s NTP source, rather than it going to the actual NTP Master.
I have changed the values in the PDC to point to a different switch (3750) that has it’s time synced with the NTP master, but the PDC doesn’t want to know. I assume it will only accept the time from an official NTP Master .
Could any of you fine people advise if what I am trying to do is possible and if so how I would go about it. I was thinking of setting the 3750 with the NTP Master command also, but I don’t want to confuse the other cisco devices in the network
Thanks in advance
David

Thanks Marvin,
I can confirm the Stratum on the 3750 is set to 15.  This is due to the NTP Time source being an internal router and not an authoritative time source out on the internet.  When setting the clock and using the NTP Master command on my internal router it sets the Stratum level to 14.
I have pointed the PDC at the Router (Stratum 14) and it does successfully sync time, but won't trust it as a valid source after the first sync.  Upon reading I believed this to be the IOS bug as the symptoms are identical. Your theory of the PDC requiring a Stratum 2 time source is logical (especially in this scenario) but I have seen them use Stratum 4 before and it worked just fine.
I guess I could change the Router acting as a time source for the network to be NTP Master 1 which should force Stratum 1 giving the PDC and all other switches pointing to it a Stratumlevel of 2 which would prove it either way.  I don't mind pointing the PDC at the router instead of the switch so long as it gets the time synced and trusts it from that point on.
I was going to make the 3750 switch an NTP Master for the Network and point the PDC to it (as per my previous post) but I have noticed this morning that the NTP Master command isn't available on the 3750 as it has no hardware clock!
Are you aware of any other way of forcing the 3750 to become a time source for the PDC without using the NTP Master command?  I have looked at the NTP Peer command and I have ruled this out already and I still need the switch to be a client of the NTP Master Router on the network
Cheers for getting involved,
David

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