Configuring the Interfaces

The following sections describe how to configure Gigabit interfaces and also provide examples of configuring the router interfaces:

Configuring Gigabit Ethernet Interfaces

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface GigabitEthernet slot/subslot/port
  4. ip address ip-address mask [secondary] dhcp pool
  5. negotiation auto
  6. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

interface GigabitEthernet slot/subslot/port

Example:


Router(config)# interface GigabitEthernet 0/0/1

Configures a GigabitEthernet interface.

  • GigabitEthernet—Type of interface.

  • slot—Chassis slot number.

  • /subslot—Secondary slot number. The slash (/) is required.

  • /port—Port or interface number. The slash (/) is required.

Step 4

ip address ip-address mask [secondary] dhcp pool

Example:


Router(config-if)# ip address 10.0.0.1 255.255.255.0 dhcp pool

Assigns an IP address to the GigabitEthernet

  • ip address ip-address—IP address for the interface.

  • mask—Mask for the associated IP subnet.

  • secondary (optional)—Specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address.

  • dhcp—IP address negotiated via DHCP.

  • pool—IP address autoconfigured from a local DHCP pool.

Step 5

negotiation auto

Example:


Router(config-if)# negotiation auto

Selects the negotiation mode.

  • auto—Performs link autonegotiation.

Step 6

end

Example:


Router(config-if)# end

Ends the current configuration session and returns to privileged EXEC mode.

Configuring the Interfaces: Example

The following example shows the interface gigabitEthernet command being used to add the interface and set the IP address. 0/0/0 is the slot/subslot/port. The ports are numbered 0 to 3. 

Router# show running-config interface gigabitEthernet 0/0/0
Building configuration...
Current configuration : 71 bytes
!
interface gigabitEthernet0/0/0
no ip address
negotiation auto
end
 
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface gigabitEthernet 0/0/0

Viewing a List of All Interfaces: Example

In this example, the show platform software interface summary and show interfaces summary commands are used to display all the interfaces: 

Router# show platform software interface summary
  Interface                 IHQ  IQD  OHQ  OQD  RXBS  RXPS  TXBS  TXPS  TRTL
-----------------------------------------------------------------------------
* GigabitEthernet0/0/0        0    0    0    0     0     0     0     0     0
* GigabitEthernet0/0/1        0    0    0    0     0     0     0     0     0
* GigabitEthernet0/0/2        0    0    0    0     0     0     0     0     0
* GigabitEthernet0/0/3        0    0    0    0     0     0     0     0     0
* GigabitEthernet0            0    0    0    0     0     0     0     0     0



Router# show interfaces summary
   *: interface is up
 IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
 OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
 RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
 TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
 TRTL: throttle count

Interface             IHQ  IQD    OHQ    OQD    RXBS    RXPS    TXBS    TXPS    TRTL
------------------------------------------------------------------------------------------ 
* GigabitEthernet0/0/0 0    0      0      0      0       0       0       0       0
* GigabitEthernet0/0/1 0    0      0      0      0       0       0       0       0
* GigabitEthernet0/0/2 0    0      0      0      0       0       0       0       0
* GigabitEthernet0/0/3 0    0      0      0      0       0       0       0       0
* GigabitEthernet      0    0      0      0      0       0       0       0       0

Viewing Information About an Interface: Example

The following example shows how to display a brief summary of an interface's IP information and status, including the virtual interface bundle information, by using the show ip interface brief command: 

Router# show ip interface brief
Interface              IP-Address      OK?  Method  Status                 Protocol
GigabitEthernet0/0/0    10.0.0.1       YES  manual  down                   down
GigabitEthernet0/0/1    unassigned     YES  NVRAM   administratively down  down
GigabitEthernet0/0/2    10.10.10.1     YES  NVRAM   up                     up
GigabitEthernet0/0/3    8.8.8.1        YES  NVRAM   up                     up
GigabitEthernet0        172.18.42.33   YES  NVRAM   up                     up