Configuring Gigabit Ethernet Interfaces

To use J-Web configuration to configure a Gigabit Ethernet interface:

  1. Select Configure > Interfaces. The properties you can configure on a Gigabit Ethernet interface appear as shown in Figure 5.

    Figure 5: Gigabit Ethernet Interface Configuration

    Gigabit Ethernet Interface Configuration
  2. Fill in the information as described in Table 8.
  3. Click one of the following buttons:
    • To apply the configuration and stay on the configuration page, click Apply.
    • To apply the configuration and return to the main configuration page, click OK.
    • To cancel your entries and return to the main page, click Cancel.
  4. To verify that the Gigabit Ethernet interface is configured correctly, see the Junos Enhanced Services Interfaces and Routing Configuration Guide

Table 8: Gigabit Ethernet Configuration Page Summary




Logical Interfaces

Add logical interfaces

Defines one or more logical units that you connect to this physical Gigabit Ethernet interface. You must define at least one logical unit for a Gigabit Ethernet interface.

Click Add.

Logical Interface Description

(Optional) Describes the logical interface.

Type a text description of the logical interface to more clearly identify it in monitoring displays.

IPv4 Addresses and Prefixes

Specifies one or more IPv4 addresses for the interface.

  1. Type one or more IPv4 addresses and prefixes. For example:

  2. Click Add.
  3. Click OK.

To delete an IP address and prefix, select them in the Source Addresses and Prefixes box, then click Delete.

ARP Address

Enables the device to create a static Address Resolution Protocol (ARP) entry for this interface by specifying the IP address of a node to associate with its media access control (MAC) address. The IP address must be in the same subnet as the IPv4 address or prefix of the interface you are configuring.

Static ARP entries associate the IP addresses and MAC addresses of nodes on the same subnet, enabling a device to respond to ARP requests having destination addresses that are not local to the incoming interface.

Type an IPv4 address that you want to associate with the MAC address; for example,

MAC Address

Specifies the hardware media access control (MAC) address associated with the ARP address.

The MAC address uniquely identifies the system and is expressed in the following format: mm:mm:mm:ss:ss:ss. The first three octets denote the hardware manufacturer ID, and the last three are serial numbers identifying the device.

Type the MAC address to be mapped to the ARP entry; for example, 00:12:1E:A9:8A:80.


Enables the device to reply to ARP requests for the specified address.

  • To enable publishing, select the check box.
  • To disable publishing, clear the check box.

Physical Interface Description

(Optional) Adds supplementary information about the physical Gigabit Ethernet interface.

Type a text description of the Gigabit Ethernet interface to more clearly identify it in monitoring displays.

MTU (bytes)

Specifies the maximum transmission unit (MTU) size for the Gigabit Ethernet interface.

Type a value between 256 and 9014 bytes. The default MTU for Gigabit Ethernet interfaces is 1514.

The default MTU for Fast Ethernet interfaces is 1518.

Per Unit Scheduler

Enables scheduling on logical interfaces.

Allows you to configure multiple output queues on a logical interface and associate an output scheduler and shaping rate with the queues.

  • To enable scheduling, select the check box.
  • To disable scheduling, clear the check box.
Gigabit Ethernet Options

Flow Control

Enables or disables flow control.

Select Yes to enable flow control to regulate the amount of traffic sent out of the interface, or select No to disable flow control and permit unrestricted traffic. Flow control is disabled by default.


Enables or disables the loopback option.

Select Yes to enable the loopback diagnostic option, or select No to disable the loopback option. By default, loopback is disabled.

Source Filtering

Enables or disables source filtering. Enabling source filtering blocks all incoming packets to the interface.

For more information, see the Junos OS Network Interfaces Library for Routing Devices.

Select Yes to enable source filtering, or select No to disable the source filtering. By default, source filtering is disabled.

Note: If you disable source filtering, the source MAC address filtering is also disabled.

Auto Negotiation

Enables or disables autonegotiation.

Select Yes to enable autonegotiation, or select No to disable it. By default, autonegotiation is disabled.

Auto Negotiation Remote Fault

Indicates the autonegotiation remote fault value.

Select the autonegotation remote fault value from the list of options given. This field is enabled only if autonegotiation is enabled.

Source MAC Address Filters

Displays the list of media access control (MAC) addresses from which you want to receive packets on this interface.

Note: To enable source MAC address filtering, first enable source filtering by selecting the Yes check box next to Source Filtering.

To add MAC addresses, type them in the boxes above the Add button, then click Add.

To delete a MAC address, select it in the Source Addresses box, then click Delete.

Redundant parent

Specifies the name of the redundant Ethernet interface that a physical interface is associated with to form a redundant Ethernet interface pair.

Specify a redundant Ethernet interface name.


Specifies a “bundle” of Gigabit Ethernet interfaces on this router with which to share traffic.

To use this feature, you must already have configured an aggregate Ethernet interface by specifying the link number as a physical device and then associating a set of ports that have the same speed and are in full-duplex mode.

Type an aggregated Ethernet interface value; for example, ae0. Aggregated Ethernet interface names range from ae0 through ae15.

Note: The J-Web interface displays error messages if you enter an incorrect value.

For more information, see the Junos OS Network Interfaces Library for Routing Devices.

Tag Protocol ID

Displays a list of IEEE 802.1Q Tag Protocol Identifier (TPID) values. The TPIDs identify frames that are to be processed as virtual LAN (VLAN)-tagged frames.

To use this feature, you must already have enabled VLAN tagging. VLAN tags enable you to channelize an Ethernet interface into multiple logical interfaces, allowing many hosts to be connected to the same 10-Gigabit Ethernet switch.

To add a TPID, type it in the boxes above the Add button, then click Add.

To delete a TPID, select it in the box, then click Delete.

Each 10-Gigabit Ethernet port can have up to eight TPIDs.

For more information about TPIDs and VLAN tagging, see the Junos OS Network Interfaces Library for Routing Devices.

MAC Learning

Enables or disables source and destination MAC address learning dynamically.

Select Yes to enable dynamic MAC address learning, or select No to disable it. By default, dynamic MAC address learning is disabled.

You can also manually set the speed and link mode for built-in and copper PIM Gigabit Ethernet interfaces on J4350 and J6350 devices using the CLI commands set interfaces ge-pim/0/port speed 10m | 100m | 1000m and set interfaces ge-pim/0/port link-mode half-duplex | full-duplex. (You cannot manually configure speed and link mode on SFP Gigabit Ethernet PIMs.) You must configure both link mode and speed—if you configure only one or the other, the system ignores the configuration and generates a system log message.