Can't RIS over subnets

We are currently running AD and are trying to RIS over subnets. RIS works fine on the same subnet. We have 650 cores and 3500 edge switches. DHCP is working fine.  Does anybody have a good config to use for the router.
goodnetworkingAsked:
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rhandelsConnect With a Mentor Commented:
Hi,

From another post, it might help

We have 1 RIS server with multiple subnets. Each subnet has its own DHCP
server. We have 2 DNS servers

When we try to pull down an image on the same subnet as the RIS server we
have no problem. But when we try from a remote subnet we get the error ' no
DHCP server available' But if you boot into windows you can release and
renew your IP without a problem.

We are a fully switched network, with cisco routers.

I remember reading somewhere that the RIS client computer sends a broadcast.
Which the local DHCP should respond to.

Can someone shed some light on this for me?



Or maybe this helps..
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q255952
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goodnetworkingAuthor Commented:
Meant 6509 cores
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rhandelsCommented:
Hi,

Make sure it has "spanning tree" is enabled. If you use a Cisco switch, make sure to add this key (see below) to every port. I also though that RIS only works on it's own subnet (not quite sure though). You could try using a RIS bootdisk, this searches for the server using the bootdisk, so this might work..

spanning-tree portfast
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goodnetworkingAuthor Commented:
Hello,
yes, we do have spanning-tree portfast enabled on all ports. the error we are getting is  PXE-E52: proxyDHCP offers were received. No DHCP offers were received. we know dhcp is working b/c we can look at dhcp and see the computer trying to ris get an address.
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lrmooreConnect With a Mentor Commented:
Assuming that you have vlans, and vlan interfaces on your MSFC of the 6509, do you have the "ip helper-address <ip of dhcp server" configured on each of the vlans? Do you have multiple scopes setup on the DHCP server, 1 for each subnet? Is the scope setup properly with the proper gateway setting per subnet?



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