OPA-MAS

Nope havent changed the TFTPWindowsSize Looks like we will have to make someone do nights to image everything lol I will keep searching but there is nothing out there about this problem I will also look into them unrelated things Thanks for all your help

That was my thinking but it was doing the same on our old SCCM setup. I dont understand why its working when no one is on the network. PXE just fails but on PXE Legacy its fine Thanks Hyper-V to Core Link interface TenGigabitEthernet1/5 description ***Public*** switchport trunk allowed vlan VLANS switchport trunk allowed vlan add VLANS switchport mode trunk spanning-tree portfast trunk spanning-tree bpduguard enable ! interface TenGigabitEthernet1/6 description ***Public*** switchport trunk allowed vlan VLANS switchport trunk allowed vlan add VLANS switchport mode trunk spanning-tree portfast trunk spanning-tree bpduguard enable ! Core to Edge Link interface TenGigabitEthernet2/1 description **TRUNK TO HUB** switchport trunk native vlan 301 switchport trunk allowed vlan VLANS switchport trunk allowed vlan add VLANS switchport mode trunk udld port aggressive ! Edge to Core interface TenGigabitEthernet1/0/1 description ****TRUNK TO CORE*** switchport trunk native vlan 301 switchport trunk allowed vlan VLANS switchport trunk allowed vlan add VLANS switchport mode trunk udld port aggressive !

I'm glad in a way its not just me DHCP Snooping is disabled on both cores and all the edge switches. Core: Switch DHCP snooping is disabled DHCP snooping is configured on following VLANs: none DHCP snooping is operational on following VLANs: none DHCP snooping is configured on the following L3 Interfaces: Insertion of option 82 is enabled circuit-id default format: vlan-mod-port remote-id: 7cad.740d.ce00 (MAC) Option 82 on untrusted port is not allowed Verification of hwaddr field is enabled Verification of giaddr field is enabled DHCP snooping trust/rate is configured on the following Interfaces: Interface Trusted Allow option Rate limit (pps) ----------------------- ------- ------------ ---------------- Edge: Switch DHCP snooping is disabled DHCP snooping is configured on following VLANs: none DHCP snooping is operational on following VLANs: none DHCP snooping is configured on the following L3 Interfaces: Insertion of option 82 is enabled circuit-id default format: vlan-mod-port remote-id: 7010.5c09.0d00 (MAC) Option 82 on untrusted port is not allowed Verification of hwaddr field is enabled Verification of giaddr field is enabled DHCP snooping trust/rate is configured on the following Interfaces: Interface Trusted Allow option Rate limit (pps) ----------------------- ------- ------------ ----------------

Thank you for your fast reply No it's happening on everything even on the Hyper-V Cluster which is connected to the both core switches on a 20 Gbps NIC. Here is one port config but its happening on all ports Thanks Port Config: interface GigabitEthernet1/0/43 switchport access vlan 302 switchport mode access spanning-tree portfast spanning-tree bpduguard enable !

Morning I'm looking for a little help please with the following; Problem: We are able to PXE boot using legacy anytime of the day but uefi only works when there isnt much traffic on the network (Evenings and Mornings) UEFI also works on VLANs with low traffic Any help would be great Thank you Setup: - Windows Server 2016 Datacenter with SCCM 1810 using ConfigMgr PXE Responder not WDS - 2x Windows DHCP Servers - 2x Cisco Core Switches (Cisco 4900M) with IP Helpers (see below) - We have no wds dhcp options set VLAN interface on each core switch: interface Vlan302 description ***PC_VLAN302*** ip address 10.0.33.2 255.255.255.0 ip helper-address 10.0.53.137 <<<<<<<<<<<<<< DHCP Server 1 ip helper-address 10.0.53.138 <<<<<<<<<<<<<< DHCP Server 2 ip helper-address 10.0.54.76 <<<<<<<<<<<<<< SCCM PXE Server no ip proxy-arp ip pim dr-priority 3 ip pim sparse-dense-mode standby 32 ip 10.0.33.1 standby 32 timers 1 3 standby 32 preempt standby 32 authentication md5 key-chain HSRP_hash_key !