Setup Guide

Table Of Contents
Link MTU and IP MTU considerations for port channels and VLANs are as follows.
Port Channels:
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.
For 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:
All members of a VLAN must have the 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.
For 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.
NOTE: When configuring IP MTU on an interface, make sure to set the same or maximum IP MTU value on both ingress
and egress interfaces to make IPv4 traffic flow.
Configuring wavelength for 10–Gigabit SFP+
optics
You can set the wavelength for tunable 10–Gigabit SFP+ optics using the wavelength command. To set the wavelength, follow these
steps:
Enter the interface mode and set the wavelength.
INTERFACE mode
wavelength 1529.0
The wavelength range is from 1528.3 nm to 1568.77nm.
Verify configuration changes.
INTERFACE mode
show config
Port-Pipes
A port pipe is a Dell EMC Networking-specific term for the hardware packet-processing elements that handle network traffic to and from
a set of front-end I/O ports. The physical, front-end I/O ports are referred to as a port-set. In the command-line interface, a port pipe
is entered as port-set port-pipe-number.
CR4 Auto-Negotiation
You can configure interface type as CR4 with auto-negotiation enabled. Many DAC cable link issues are resolved by setting the interface
type as CR4. If the CR4 optic fails to come up, use the autoneg option.
To configure interface type as CR4 with auto-negotiation enabled, use the following commands.
Set the interface type as CR4 with auto-negotiation enabled.
INTERFACE mode
intf-type cr4 autoneg
To disable CR4 auto-negotiation, use the no intf-type cr4 autoneg command.
Verify the configuration.
INTERFACE mode
show config
DellEMC(conf)#interface hundredGigE 1/1
DellEMC(conf-if-hu-1/1)#intf-type cr4 autoneg
Interfaces
377