Understanding Nexus -- Part 8 -- Basic Interface Configs

The NX-OS supports multiple L2 and L3 Physical Interfaces types to meet various requirements.  All interfaces are in the shutdown state by default.

In NX-OS, all Ethernet interfaces are called “ethernet”, no more FastEtherenet, GigabitEthernet, etc. Also, the keyword “range” is not necessary when configuring a group of interfaces

 

switch(config)# int ?

  cmp-mgmt      CMP management ethernet

  ethernet      Ethernet IEEE 802.3z

  loopback      Loopback interface

  mgmt          Management interface

  port-channel  Port Channel interface

  vlan          Vlan interface

switch(config)# int e10/18 ?

    

  ,      Comma

  -      Hyphen

By default, all ports on the device are Layer 3 ports.

NX-OS provides a configuration to change the default port mode from L3 to L2. Configure the default port mode to L2 then change it back to L3.

The configuration of an interface in default (L3) state :

 

switch# sh run int e1/18

version 4.0(2)

interface Ethernet1/18

  no shutdown

Change the default mode from L3 to L2

switch# config t

switch(config)# system default switchport

The configuration of an interface in L2 state :

switch# sh run int e1/18

version 4.0(2)

interface Ethernet1/18

  no switchport

  no shutdown

Change the default port mode from L2 to L3.

 

switch(config)# no system default switchport

Now lets see the basic interface parameter configuration. These are all same as you see in IOS.

switch# configure terminal 

switch(config)# interface ethernet 3/24

switch(config-if)# description server1

switch(config-if)# speed 1000         --- Speed of Interface 10/100/1000 Mbps

switch(config-if)# duplex full        --- Half/Full Duplex

switch(config-if)# bandwidth 1000000  --- Look at Note.

switch(config-if)# delay 10000        --- Look at Note.

switch(config-if)# no shutdown        --- Enables an interface. Default is Shutdown

NOTE:

The bandwidth as an informational-only value between 1 and 10,000,000.
The command doesn't set BandWidth on interface. Its just an info for routing protocols, so that it can calculate its cost.

The delay time in tens of microseconds.