Dell 9.7(0.0) manual 692

Usage Information

The following is a list of the Dell Networking OS version history for this command.

VersionDescription

9.7(0.0) Introduced on the S6000-ON.

9.0.2.0Introduced on the S6000.

8.3.19.0Introduced on the S4820T.

8.3.11.1Introduced on the Z9000.

8.3.7.0Introduced on the S4810.

8.1.1.0Introduced on the E-Series ExaScale.

7.5.1.0Introduced on the C-Series.

pre-Version	Introduced on the E-Series.
6.2.1.0

If the packet includes a Layer 2 header, the difference between the link MTU and IP MTU (ip mtu command) must be enough bytes to include the Layer 2 header.

When you enter the no mtu command, Dell Networking OS reduces the IP MTU value to 1536 bytes.

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. For 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. For example, the VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The VLAN’s Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes.

The following shows the difference between Link MTU and IP MTU.

Layer 2 Overhead	Link MTU and IP MTU Delta
Ethernet	18 bytes
(untagged)
VLAN Tag	22 bytes

692 Interfaces