Administrator Guide

Null Interfaces
The Null interface is another virtual interface. There is only one Null interface. It is always up, but no traffic is transmitted through this
interface.
To enter INTERFACE mode of the Null interface, use the following command.
• Enter INTERFACE mode of the Null interface.
CONFIGURATION mode
interface null 0
The only configurable command in INTERFACE mode of the Null interface is the ip unreachable command.
Configuring Port Delay
To configure a delayed bring up of all interfaces during switch boot up, use the following command:
• Enter the CONFIGURATION mode.
CONFIGURATION mode
Use the port-delay-restore command and ensure to specify a value between 1 second and 300 seconds.
DellEMC(conf)#port-delay-restore 300
Use the no port-delay-restore command to disable the feature.
DellEMC(conf)#no port-delay-restore
If you would like to turn this feature off for an individual interface, enter the INTERFACE mode and use the no port-delay-restore
command.
DellEMC(config-if)#no port-delay-restore
NOTE:
In a stacking environment, the port-delay-restore timer kicks in for each individual stack-unit separately as it
boots up.
Port Channel Interfaces
Port channel interfaces support link aggregation, as described in IEEE Standard 802.3ad.
This section covers the following topics:
• Port Channel Definition and Standards
• Port Channel Benefits
• Port Channel Implementation
• Configuration Tasks for Port Channel Interfaces
Port Channel Definition and Standards
Link aggregation is defined by IEEE 802.3ad as a method of grouping multiple physical interfaces into a single logical interface—a link
aggregation group (LAG) or port channel.
A LAG is “a group of links that appear to a MAC client as if they were a single link” according to IEEE 802.3ad. In Dell EMC Networking
OS, a LAG is referred to as a port channel interface.
A port channel provides redundancy by aggregating physical interfaces into one logical interface. If one physical interface goes down in the
port channel, another physical interface carries the traffic.
Interfaces
315