Reference Guide

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 (untagged) 18 bytes
VLAN Tag 22 bytes
Untagged Packet
with VLAN-Stack
Header
22 bytes
Tagged Packet with
VLAN-Stack Header
26 bytes
negotiation auto
Enable auto-negotiation on an interface.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
negotiation auto
To disable auto-negotiation, use the no negotiation auto command.
Defaults Enabled.
Command Modes INTERFACE
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
pre-Version
6.2.1.0
Introduced on the E-Series.
Usage
Information
This command is supported on C-Series, S-Series, and E-Series (TeraScale and ExaScale)
10/100/1000 Base-T Ethernet interfaces.
The no negotiation auto command is only available if you first manually set the speed
of a port to
10Mbits or 100Mbits.
The negotiation auto command provides a mode option for configuring an individual
port to forced-master/forced slave after you enable auto-negotiation.
NOTE: The mode option is not available on non-10/100/1000 Base-T Ethernet line cards.
If you do not use the mode option, the default setting is slave. If you do not configure forced-
master or forced-slave on a port, the port negotiates to either a master or a slave state. Port
status is one of the following:
793