Interface MTU Setting

NE40E-M2H and M2K V800R011C10 Configuration Guide - IP Services 02

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When nodes are properly communicating, use the default MTU value. Two nodes on both ends of a link must use the same MTU value so that they can properly operate protocols, such as OSPF and IS-IS, and successfully forward packets.

To change an interface MTU, run the mtu mtu-value command in the interface view. For information about MTU settings' impact on packet transmission is up to traffic type, interface type and board type.

Each interface on NE40E has a default interface MTU value. The Table 8-1 lists interface default MTUs on NE40E.

Table 8-1 Interface default MTUs

Interface Type	Default MTU Value (Bytes)	Value Range (Bytes)	Description
Ethernet interface Ethernet sub-interface	1500	46 to 1500	Interface MTUs on Ethernet interfaces or sub-interfaces take effect only on Layer 3 traffic. NOTE: An Ethernet interface and its sub-interface work at Layer 3 by default and send only Layer 3 traffic. After the portswitch command is run on the Ethernet interface, the Ethernet interface and its sub-interfaces work at Layer 2 and send only Layer 2 traffic.
Eth-Trunk interface Eth-Trunk sub-interface	1500	46 to 9600	Interface MTUs take effect only on Layer 3 traffic. NOTE: An Eth-Trunk interface and its sub-interfaces work at Layer 3 by default and send only Layer 3 traffic. After the portswitch command is run in the Eth-Trunk interface view, the Eth-Trunk interface and its sub-interfaces work at Layer 2 and send only Layer 2 traffic. The interface MTU must be changed in the Eth-Trunk interface view or sub-interface view, not the member interface view. After a member interface is added to an Eth-Trunk interface, the Eth-Trunk interface MTU automatically takes effect on the member interface. When the Eth-Trunk interface MTU changes, member interfaces automatically synchronize their MTU values with the Eth-Trunk interface MTU. The MTU values on both ends of an Eth-Trunk link must be the same. An MTU inconsistency may cause a service interruption.
GE interface GE sub-interface	1500	46 to 9600	Both control traffic and forwarding traffic will be affected by MTU setting. NOTE: A GE interface and its sub-interfaces work at Layer 3 by default and send only Layer 3 traffic. After the portswitch command is run in the GE interface view, the GE interface and its sub-interfaces work at Layer 2 and send only Layer 2 traffic.
Tunnel interface	1500	46 to 9600	Generally applied only to LDP over TE scenarios.
VLANIF interface	1500	46 to 9600	MTUs on VLANIF interfaces take effect only on Layer 3 IP traffic.
Virtual-Ethernet interface	1500	960 to 1518	MTUs on VE interfaces take effect only on Layer 3 traffic. A VE interface works at Layer 3 by default and sends only Layer 3 traffic. After the portswitch command is run, the VE interface works at Layer 2 and sends only Layer 2 traffic.
Virtual-Template interface	1500	328 to 9600	Interface MTUs configured on VT interfaces are used in the Link Control Protocol (LCP) phase. Two Point-to-Point Protocol (PPP) nodes exchange packets to negotiate and select the smaller one between two configured MTUs as the effective MTU.

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Updated: 2020-02-11

Document ID: EDOC1100126119

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