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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.
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goodnetworking

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Meant 6509 cores
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
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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