Reference Guide

626 | Interfaces
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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.
negotiation auto
c e s
Enable auto-negotiation on an interface.
Syntax
negotiation auto
To disable auto-negotiation, enter
no negotiation auto.
Defaults
Enabled.
Command Modes
INTERFACE
Command
History
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 once auto-negotiation is enabled
Table 23-3. 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
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
pre-Version 6.2.1.0 Introduced for E-Series
Note: The mode option is not available on non-10/100/1000 Base-T Ethernet line
cards.