Failed to restart TFTP issue

[richard_chen]

SebastianRoth, thanks for your reply,
I'm sorry to say nothing about the quantity of DHCP&IPXE, we found if there only have one DHCP server, it can boot normal. if there have two and more DHCP, it will happend this issue.
I get these packets with wireshark from mirror port on the switch, and packets like bellow,
1. DHCP Discover
2. DHCP offer --- DHCP 1
2. DHCP offer --- DHCP 2
2. DHCP offer --- DHCP 3
3. DHCP request ---source:0.0.0.0 Des:255.255.255.255
4. DHCP ACK----Source:XX.XX.XX.XX(DHCP serverip) 回覆your client ip:xx.xx.xx.xx
5. DHCP request
6. DHCP ACK ---- boot file name: boot\x86\wdsnbp.com
7. TFTP ---read request, File: boot\x86\wdsnbp.com
8. lots of packets for wdsnbp.com by TFTP
9. DHCP request
10. DHCP ACK ---- boot file name: boot\undionly.kpxe

After step 10, it always repeat setepping 9&10 for each 5 seconds.
Any idea for it debugging?