Juniper qfx set mtu Changing the media MTU size causes an interface to be deleted and added again. <unit>) will not be honored. Specify the maximum transmission unit (MTU) size for the media. g. 1q tagged interfaces. However, even if MRU allows you to receive slightly bigger (e. The MTU for the IRB logical interface is inherited from the lowest MTU of the layer two interfaces that are part of the VLAN. if interfaces have different mtu (jumbo on one and standard 1500 on another), the irb will inherit the lowest MTU value present on the switch. . If the lowest MTU is 1514, the IRB unit MTU will be 1514 regardless of the user-configured MTU applied, or if other Jumbo frames can be configured on the physical interfaces on the Juniper Networks EX/QFX Series Switches. Jumbo frames are Ethernet frames with more than 1,500 bytes of payload (Maximum Transmission Unit, MTU). Configure the media MTU for a physical interface and the MTU for a protocol to optimize traffic over your network. Ethernet Frame It boils down to the fact that MRU is always bigger then MTU on EX switches. The media maximum transmission unit (MTU) for an interface is the largest data unit that can be forwarded through that interface without fragmentation. Trying to set a MTU higher than your interface will even give you a commit warning: This post outlines the MTU configuration differences on Cisco IOS/XE/XR and Juniper Junos. Specify the maximum transmission unit (MTU) size for the media. Parts 2 and 3 will cover Jumbo Frames/IP MTU and MPLS MTU/802. Configuring MTU on 'irb' (not irb. tagged packets), MTU configuration should control whether such frames can be sent out of the interface.
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