Dell Force10 MXL Blade Reference Manual page 253

Parameters
value
Defaults 1554
Command Modes
INTERFACE
Command
Version 8.3.16.1
History
Usage If the packet includes a Layer 2 header, the difference between the link MTU and IP MTU ( ip mtu
Information
command) must be enough bytes to include the Layer 2 header:
•
When you enter the no
Link MTU and IP MTU considerations for port channels and VLANs are as follows.
port channels:
•
•
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:
•
•
•
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.
Table 14-3. Difference between Link MTU and IP MTU
Layer 2 Overhead
Ethernet (untagged)
VLAN Tag
Untagged Packet with VLAN-Stack Header
Tagged Packet with VLAN-Stack Header
Enter a maximum frame size in bytes.
Range: 594 to 9252
MXL Switch Range: 594 to 12000
Default: 1554
The IP MTU will get adjusted automatically when the Layer 2 MTU is configured with the mtu
command.
mtu
command, FTOS reduces the IP MTU value to 1536 bytes.
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.
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.
Introduced on MXL 10/40GbE Switch IO Module
Link MTU and IP MTU Delta
18 bytes
22 bytes
22 bytes
26 bytes
Interfaces | 253