JUNOSe 9.1.x Physical Layer Configuration Guide > Configuring Ethernet Interfaces > Configuring the Physical Interface

Configuring the Physical Interface

This section describes how to complete the basic configuration for a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet interface. CLI examples are provided with the individual command descriptions.

To configure an Ethernet interface:

1. Select an Ethernet interface.
2. (Optional) Specify the line speed and duplex mode.
3. (Optional) Specify the MTU.
4. (Optional) Set the time interval at which the router records bit and packet rates.
5. (Optional) Associate a name with the interface.
6. (Optional) Validate MAC addresses on a per interface basis.

duplex

• Use to specify the duplex mode.
• This command also works on the Fast Ethernet port on the SRP module on all E-series routers. For more information, see the Managing the Ethernet Port on the SRP Module in JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules.
  

  NOTE: If you set either the line speed or duplex mode to automatically negotiate by using the automatically negotiate keyword, the router negotiates both parameters. You can specify different values to prevent the router from negotiating these parameters. Automatic negotiation is not supported for the FE-8 SFP I/O module. For this I/O module, full duplex mode is the default.

  
  
• Example

host1(config-if)#duplex full

• Use the no version to revert to the default, either automatically negotiate or full duplex (FE-8 SFP I/O module only)

ethernet description

• Use to associate a text description of up to 64 characters with an Ethernet interface.
• This command does not work for the Fast Ethernet port on the SRP module.
• The description is displayed in the output for show configuration, show interfaces fastEthernet, show interfaces gigabitEthernet, and show interfaces tenGigabitEthernet commands.
• Example

host1(config-if)#ethernet description abcd1234

• Use the no version to remove the description from the interface.

interface fastEthernet

• Use to select a Fast Ethernet interface on a line module.
• You can also use it to select a Fast Ethernet management port on an SRP I/O module (ERX-7xx models, ERX-14xx models, and the ERX-310 router) or an SRP IOA (E120 and E320 routers). For information about managing the Fast Ethernet port on the SRP module, see JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules.
• Use the slot/port [.subinterface] format for Fast Ethernet interfaces on ERX-7xx models, ERX-14xx models, and the ERX-310 router. Use the slot/adapter/port format for the SRP IOA on the E120 or E320 routers; the port on the SRP IOA is always identified by 0.
• Example 1—Selects a Fast Ethernet interface on ERX-7xx models, ERX-14xx models, or the ERX-310 router

host1(config)#interface fastEthernet 1/0

• Example 2—Selects the Fast Ethernet management port on an E320 router

host1(config)#interface fastEthernet 6/0/0

• Use the no version to remove IP from an interface or subinterface. You must issue the no version from the highest level down; you cannot remove an interface or subinterface if the one above it still exists.

interface gigabitEthernet

• Use to select a Gigabit Ethernet interface.
  

  NOTE: On the GE I/O module, you can configure only the primary port, 0. The router automatically uses the redundant port, 0R, if the primary port fails. On the GE-2 SFP I/O module, you can configure only the primary ports, 0 and 1. The router automatically uses the corresponding redundant port, 0R or 1R, if the primary port fails. On the OC3-2 GE APS I/O module, you can configure only port 2. Ports 0 and 1 are reserved for OC3/STM1 ATM interfaces. This I/O module does not support redundant ports in the current release. On the ES2-S1 GE-4 IOA, you can configure all four ports. On the ES2-S1 GE-8 IOA, you can configure all eight ports.

  
  
• Use the slot/port [.subinterface] format for Gigabit Ethernet interfaces on ERX-7xx models, ERX-14xx models, or the ERX-310 router; use the slot/adapter/port format for Gigabit Ethernet interfaces on the E120 and E320 routers.
• Example 1—Selects a Gigabit Ethernet interface on ERX-7xx models, ERX-14xx models, and the ERX-310 router

host1(config)#interface gigabitEthernet 1/0

host1(config)#interface gigabitEthernet 2/1 

• Example 2—Selects a Gigabit Ethernet interface on the E320 router

host1(config)#interface gigabitEthernet 4/0/1

• Use the no version to remove IP from an interface. You must issue the no version from the highest level down; you cannot remove an interface or subinterface if the one above it still exists.

interface tenGigabitEthernet

• Use to select a 10-Gigabit Ethernet interface on the E120 router or the E320 router.
  

  NOTE: On the ES2-S2 10GE PR IOA, you can configure only the primary port, 0. The router automatically uses the redundant port, 0R, if the primary port fails.

  
  
• Use the slot/adapter/port format.
• Example—Selects a 10-Gigabit Ethernet interface on the ES2-S1 10GE IOA

host1(config)#interface tenGigabitEthernet 4/0/1

• Use the no version to remove IP from an interface. You must issue the no version from the highest level down; you cannot remove an interface or subinterface if the one above it still exists.

ip mac-validate

• Use to enable or disable MAC address validation on a per interface basis.
• Use the strict keyword to prevent transmission of IP packets that do not reside in the validation table.
• Use the loose keyword to enable IP packets to pass through even though the packets do not have entries in the validation table. Only packets that have matching IP–MAC pair entries in the table are validated.
• The default behavior is not to perform MAC address validation.
• Example

host1(config)#interface gigabitEthernet 2/0

host1(config-if)#ip address 4.4.4.2 255.255.255.0

host1(config-if)#ip mac-validate strict

host1(config-if)#exit

• Use the no version to disable the command.
  

  NOTE: For additional information about MAC address validation, see the arp validate command description in JUNOSe IP, IPv6, and IGP Configuration Guide, Chapter 1, Configuring IP.

  
  

load-interval

• Use to set the time interval at which the router calculates bit and packet rate counters.
• This command does not work for the Fast Ethernet port on the SRP module.
• Specify a multiple of 30 seconds, in the range 30–300 seconds.
• The default value is 300 seconds.
• Example

host1(config-if)#load-interval 90

• Use the no version to restore the default time interval, 300 seconds.

mtu

• Use to specify the MTU for an interface.
• Specify a value in the range 64–9188 bytes. The range for FE-8 I/O modules is 64–9042 bytes.
• This command does not work for the Fast Ethernet port on the SRP module.
• Example

host1(config-if)#mtu 9000

• Use the no version to specify the default, 1518.

speed

• Use to specify the line speed.
• This command also works on the Fast Ethernet port on the SRP module on all E-series routers. For more information, see Managing the Ethernet Port on the SRP Module in JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules.
  

  NOTE: If you set either the line speed or duplex mode to automatically negotiate by using the automatically negotiate keyword, the router negotiates both parameters. You can specify different values to prevent the router from negotiating these parameters. Automatic negotiation is not supported for the FE-8 SFP I/O module. For this I/O module, the default speed is 100 Mbps.

  
  
• Example

host1(config-if)#speed 10

• Use the no version to revert to the default, either automatically negotiate or 100 Mbps (FE-8 SFP I/O module only).