Dell Force10 S4820T FTOS Command Reference Guide - Page 625

Parameters value Enter a maximum frame size in bytes. Range: 594 to 9252 S4810 and S4820T Range: 594 to 12000 Default: 1554 Defaults 1554 Command Modes INTERFACE Command History Version 8.3.19.0 Version 8.3.11.1 Version 8.3.7.0 Version 8.1.1.0 Version 7.5.1.0 pre-Version 6.2.1.0 Introduced on S4820T Introduced on Z9000 Introduced on S4810 Introduced on E-Series ExaScale Introduced on C-Series Introduced for E-Series Usage If the packet includes a Layer 2 header, the difference between the link MTU and IP MTU (ip Information mtu command) must be enough bytes to include the Layer 2 header: • On C-Series, the IP MTU will get adjusted automatically when the Layer 2 MTU is configured with the mtu command. • On the E-Series, you must compensate for a Layer 2 header when configuring IP MTU and link MTU on an Ethernet interface. Use the ip mtu command. When you enter the no mtu command, FTOS reduces the IP MTU value to 1536 bytes. On the E-Series, to return the IP MTU value to the default, enter no ip mtu. Link MTU and IP MTU considerations for port channels and VLANs are as follows. Port channels: • All members must have the same link MTU value and the same IP MTU value. • The port channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the channel members. Example: if the members have a link MTU of 2100 and an IP MTU 2000, the port channel's MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU. VLANs: • All members of a VLAN must have same IP MTU value. • Members can have different Link MTU values. Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag. • The VLAN link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the VLAN members. Interfaces | 625