This article describes how to set MTU configuration for all the switch interfaces.

The default MTU value for interfaces is 1514, and the requirement is for all interfaces to be using MTU 9192 as default.

There is no default MTU configuration that can be altered to set as 9192. However, it can be mimicked by setting the value for the MTU for all interfaces in one of the following ways -

• Set MTU value for a group

[edit groups MTU-Default]
user@juniper# wildcard range set interfaces xe-0/0/[0-47] mtu 9192
user@juniper# top

[edit]
user@juniper# set apply-groups MTU-Default
user@juniper# commit

• Define the MTU for an interface range

user@juniper# set interfaces interface-range DEFAULT-MTU member-range xe-0/0/0 to xe-0/0/47
user@juniper# set interfaces interface-range DEFAULT-MTU mtu 9192


After commit,

user@juniper> show interfaces xe-0/0/0 extensive | match mtu
  Link-level type: Ethernet, MTU: 9192, LAN-PHY mode, Link-mode: Full-duplex, Speed: 10Gbps, BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None, Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource errors: 0