Cisco 4948E switch and

On out prod env, we have a 4948E switch with a DHCP server and the sysadmin guys use it to for loading new images on MacBooks (via netboot). Recently, netboot has been failing, upon investigation. Hosts cannot netboot because they aren't getting a DHCP assigned IP from the DHCP server. Looking at the tcpdump, we see the hosts send out 6 DHCP requests before the DHCP server finally sends a reply with an IP. The problem is when u do a netboot, it sends out one DHCP request and thus it never gets a reply from the DHCP server this netboots don't work. I replaced the 4948E with a dumb Netgear switch and everything works fine. We see one DHCP request and one DHCP server reply.

I also got another 4948E set up in the lab, did a write erase, set u a DHCP server on a windows laptop and connected another windows laptop and it got a DHCP reply after one request. I took this same switch and put back on the porduction env and the same issue occurs, hosts have to send out 6 DHCP requests before they get a reply back.

The 4948E running the E8 iOS image. Anyone seen anything like this?

Thanks