![]() > 6- Juniper CE (EX4200) trunk port connected to Fortinet Firewall has mtu 2000 and default both tried > 5- Juniper CE (EX4200) trunk port conencted to PE2 has mtu 2000 I believe we should be able to find out, but let me ask you a few questions first then I will give you a troubleshooting procedure. Some hardware faults (bad packet memory) tend to cause this, both on Cisco and on Juniper devices. More than a MTU issue, it looks like some kind of fault on one of the devices which is causing large frames to be dropped. ![]() Even adding a couple of MPLS labels, we are not close enough to Ethernet MTU for this to be a likely cause. Microsoft ping '-l' uses ICMP payload size rathern than the whold datagram size you need to add to it 42 bytes (and another 4 bytes for vlan tag) this brings you to a datagram size of 1306. I would highly appreciate if any body could guide in right direction, where is the problem of MTU? NOTE: Fortinet Firewall is connected to Juniper CE (EX4200) via trunk link having couple of VLANS and we testing using one of the VLANS So I dont think so problem lies between PE.ġ- CE (Cisco 6500) trunk port connected to Juniper PE1 has mtu defaultĢ- PE1 trunk port connected to Cisco CE has mtu 9192ģ-All core interfaces of MX in the MPLS network has MTU 9192Ĥ-PE2 trunk port connected to Juniper CE (EX4200) has mtu 9192ĥ- Juniper CE (EX4200) trunk port conencted to PE2 has mtu 2000Ħ- Juniper CE (EX4200) trunk port connected to Fortinet Firewall has mtu 2000 and default both triedħ- Fortinet Firewall trunk port connected to Juniper CE (EX4200) has mtu defaultġ- Every time if PC is behind/connected Cisco CE in the same VLAN as Fortinet through VPLS services, ping is fine but with some drops and from PC windows we can ping -t -f -l 1260 is fine but above 1260 is dropped and we are not able to access web access of fortinet firewall at all.Ģ- If PC is connected to PE1/PE2 or Juniper CE (EX4200) in the same VLAN as fortinet firewall ping is fine, web access is fine and we can ping ping -t -f -l 1400 easily In the core network interface the MTU is 9192.
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