Reference Guide

For example, the VLAN contains tagged members with a link MTU of 1522 and an IP MTU of 1500 and untagged members with a
link MTU of 1518 and an 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.
Auto-Negotiation on Ethernet Interfaces
Setting Speed and Duplex Mode of Ethernet Interfaces
By default, auto-negotiation of speed and duplex mode is enabled on 10GbE Ethernet interface on an Aggregator.
The local interface and the directly connected remote interface must have the same setting. Auto-negotiation is the easiest way to
accomplish these settings, as long as the remote interface is capable of auto-negotiation.
NOTE: As a best practice, Dell Networking recommends keeping auto-negotiation enabled. Auto-negotiation should only
be disabled on switch ports that attach to devices not capable of supporting negotiation or where connectivity issues
arise from interoperability issues.
The negotiation auto command is tied to the speed command. Auto-negotiation is always enabled when the speed command is set
to 1000 or auto. In Dell Networking OS, the speed 1000 command is an exact equivalent of speed auto 1000 in IOS.
To discover whether the remote and local interface require manual speed synchronization, and to manually synchronize them if
necessary, follow these steps.
Step Task Command Syntax Command Mode
1.
Determine the local interface status. show interfaces [interface] status EXEC Privilege
2.
Determine the remote interface status. [Use the command on the remote system that
is equivalent to the above command.]
EXEC
EXEC Privilege
3.
Access CONFIGURATION mode. cong EXEC Privilege
4.
Access the port. interface interface slot/port CONFIGURATION
5.
Set the local port speed. speed {100 | 1000 | 10000 | auto} INTERFACE
6.
Optionally, set full- or half-duplex. duplex {half | full} INTERFACE
7.
Disable auto-negotiation on the port. If the
speed is set to 1000, you do not need to
disable auto-negotiation
no negotiation auto INTERFACE
8.
Verify conguration changes. show cong INTERFACE
NOTE: The show interfaces status command displays link status, but not administrative status. For link and
administrative status, use the show ip interface [interface | brief] [configuration] command.
show interface status Command Example:
Dell# show interfaces status
Port Description Status Speed Duplex Vlan
Te 0/1 Up 10000 Mbit Full 1-4094
Te 0/2 Down Auto Auto 1-1001,1003-4094
Te 0/3 Up 10000 Mbit Full 1-1001,1003-4094
Te 0/4 Down Auto Auto 1-1001,1003-4094
Te 0/5 Up 10000 Mbit Full 1-4094
Te 0/6 Up 10000 Mbit Full 1-4094
Te 0/7 Up 10000 Mbit Full 1-4094
Te 0/8 toB300 Down Auto Auto 1-1001,1003-4094
Interfaces
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