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Understanding Interface Naming Conventions

Physical Part of an Interface Name

Interfaces in Junos OS are specified as follows:

device-name:type-fpc/pic/port

The convention is as follows:

• device-name—(QFabric systems only) The device-name is either the serial number or the alias of the QFabric system component, such as a Node device, Interconnect device, or QFabric infrastructure. The name can contain a maximum of 128 characters and cannot contain any colons.
• type—The QFX Series and EX4600 device interfaces use the following media types:
  • fc—Fibre Channel interface
  • ge—Gigabit Ethernet interface
  • xe—10-Gigabit Ethernet interface
  • xle—40-Gigabit Ethernet interface (QFX3500, QFX3600, and QFX5100 switches running a QFabric software package)
  • et—40-Gigabit Ethernet interface (QFX3500, QFX3600, QFX5100, and EX4600 switches running Enhanced Layer 2 Software)
  • fte—40-Gigabit data plane uplink interface (QFX3500, QFX3600, and QFX5100 switches running a QFabric software package)
  • me—Management interface
  • em—Management interface on QFX5100 and EX4600 switches.
• fpc—Flexible PIC Concentrator. QFX Series interfaces use the following convention for the FPC number in interface names:
  • On QFX3500, QFX3600, and QFX5100 devices running a QFabric software package, the FPC number is always 0.

    The FPC number indicates the slot number of the line card that contains the physical interface.

  • On QFX3500, QFX3600, QFX5100, and EX4600 switches running Enhanced Layer 2 Software, the member ID of a member in a Virtual Chassis determines the FPC number.

    Note: Every member in a Virtual Chassis must have a unique member ID, otherwise the Virtual Chassis will not be created.

  • On standalone QFX5100 and EX4600 switches, the FPC number is always 0.
• pic—QFX Series and EX4600 device interfaces use the following convention for the PIC (Physical Interface Card) number in interface names:
  • On a QFX3500 switch running a QFabric software package, PIC 0 can support 48 ports, PIC 1 can support 16 10-Gigabit Ethernet ports, and PIC 2 can support 4 40-Gigabit Ethernet ports.
  • On a QFX3500 switch running Enhanced Layer 2 software, PIC 0 can support 48 ports, and PIC 1 can support 16 10-Gigabit Ethernet ports, and 4 40-Gigabit Ethernet ports.
  • On a QFX3500 Node device running a QFabric software package, PIC 0 can support 48 ports and PIC 1 can support four 40-Gigabit data plane uplink ports.
  • On a QFX3600 switch running a QFabric software package, PIC 0 can support 64 10-Gigabit Ethernet ports, and PIC 1 can support 16 40-Gigabit Ethernet ports.
  • On a QFX3600 switch running Enhanced Layer 2 software, PIC 0 can support 64 10-Gigabit Ethernet ports and can also support 16 40-Gigabit Ethernet ports.
  • On a QFX3600 Node device running a QFabric software package, PIC 0 can support 56 10-Gigabit Ethernet ports, and PIC 1 can support 8 40-Gigabit data plane uplink ports, and up to 14 40-Gigabit Ethernet ports.
  • On a QFX5100-48S switch running Enhanced Layer 2 software, PIC 0 provides six 40-Gbps QSFP+ ports and 48 10-Gigabit Ethernet interfaces.
  • On an EX4600 device running Enhanced Layer 2 software, PIC 0 provides 4 40-Gbps QSFP+ ports and 24 10-Gigabit Ethernet interfaces. There are two expansion bays (PIC 1 and PIC 2), and you can insert QFX-EM-4Q expansion modules and EX4600-EM-8F expansion modules. The QFX-EM-4Q expansion module provide 4 40-Gbps QSFP+ ports. The EX4600-EM-8F expansion module provides 8 40-Gbps QSFP+ ports. You can insert any combination of expansion modules. For example, you can insert two EX4600-EM-8F expansion modules, two QFX-EM-4Q expansion modules, or one of each.
  • On a QFX5100-48S switch running a QFabric software package, PIC 1 provides six 40-Gbps QSFP+ ports, and PIC 0 provides 48 10-Gigabit Ethernet interfaces.
  • On a QFX5100-24Q switch running Enhanced Layer 2 software, PIC 0 provides 24 40-Gbps QSFP+ ports. PIC 1 and PIC 2 can each contain a QFX-EM-4Q expansion module, and each expansion module provides 4 40-Gbps QSFP+ ports
  • On a QFX5100-96S switch running Enhanced Layer 2 software, PIC 0 provides 96 10-Gigabit Ethernet interfaces and 8 40-Gbps QSFP+ ports .
• port—Interfaces use the following convention for port numbers:
  • On a QFX3500 switch running a QFabric software package, there are 48 network access ports (10-Gigabit Ethernet) labeled 0 through 47 on PIC 0 and, 16 network access ports labeled 0 through 15 on PIC 1, and four 40-Gbps QSFP+ ports labeled Q0 through Q3 on PIC 2. You can use the QSFP+ ports to connect the Node device to Interconnect devices.

    By default, the 40-Gbps QSFP+ ports are configured to operate as 10-Gigabit Ethernet ports. You can use QSFP+ to four SFP+ copper breakout cables to connect the 10-Gigabit Ethernet ports to other servers, storage, and switches. Optionally, you can choose to configure the QSFP+ ports as 40-Gigabit Ethernet ports (see Configuring the QSFP+ Port Type on QFX3500 Standalone Switches).

  • On a QFX3500 switch running Enhanced Layer 2 software, there are 48 network access ports labeled 0 through 47 on PIC 0 and 4 40-Gbps QSFP+ ports labeled Q0 through Q3 on PIC 1. See Channelizing Interfaces for information on how to configure and channelize the 40-Gbps QSFP+ ports.
  • On a QFX3600 switch running a QFabric software package, there are 64 network access ports (10-Gigabit Ethernet) labeled Q0 through Q15 on PIC 0, and there are 16 network access ports (40-Gigabit Ethernet) labeled Q0 through Q15 on PIC 1.

    By default, all the QSFP+ ports are configured to operate as 40-Gigabit Ethernet ports. Optionally, you can choose to configure the QSFP+ ports as 10-Gigabit Ethernet ports (see Configuring the Port Type on QFX3600 Standalone Switches) and use QSFP+ to four SFP+ copper breakout cables to connect the 10-Gigabit Ethernet ports to other servers, storage, and switches.

  • On a QFX3600 Node device running a QFabric software package, PIC 0 can support up to 56 10-Gigabit Ethernet ports labeled Q2 through Q15, and PIC 1 can support up to 8 40-Gigabit data plane uplink ports labeled Q0 through Q7, and up to 14 40-Gigabit Ethernet ports labeled Q2 through Q15. See Configuring the Port Type on QFX3600 Node Devices for information on how to configure the 40-Gbps QSFP+ ports.

    On a QFX3600 Node device, by default, four 40-Gbps QSFP+ ports (labeled Q0 through Q3) are configured for uplink connections between your Node device and your Interconnect devices, and twelve 40-Gbps QSFP+ ports (labeled Q4 through Q15) use QSFP+ to four SFP+ copper breakout cables to support up to 48 10-Gigabit Ethernet ports for connections to either endpoint systems (such as servers and storage devices) or external networks. Optionally, you can choose to configure the first eight ports (Q0 through Q7) for uplink connections between your Node device and your Interconnect devices, and ports Q2 through Q15 for 10-Gigabit Ethernet or 40-Gigabit Ethernet connections to either endpoint systems or external networks (see Configuring the Port Type on QFX3600 Node Devices).

  • On a QFX3600 switch running Enhanced Layer 2 software, PIC 0 can support 64 network access ports (10-Gigabit Ethernet ports) labeled Q0 through Q15 and 16 40-Gigabit Ethernet ports labeled Q0 through Q15. See Channelizing Interfaces for information on how to configure and channelize the 40-Gbps QSFP+ ports.
  • On a QFX5100-48S switch running Enhanced Layer 2 software, PIC 0 can support 48 network access ports (10-Gigabit Ethernet ports) labeled 0 through 47 and 6 40-Gbps QSFP+ ports labeled 48 through 53. See Channelizing Interfaces for information on how to configure and channelize the 40-Gbps QSFP+ ports.
  • On an EX4600 switch running Enhanced Layer 2 software, PIC 0 can support 24 network access ports (10-Gigabit Ethernet ports) labeled 0 through 23 and 4 40-Gbps QSFP+ ports labeled 24 through 27. There are two expansion bays (PIC 1 and PIC 2), and you can insert QFX-EM-4Q expansion modules and EX4600-EM-8F expansion modules. The QFX-EM-4Q expansion module provide 4 40-Gbps QSFP+ ports. The EX4600-EM-8F expansion module provides 8 40-Gbps QSFP+ ports. You can insert any combination of expansion modules. For example, you can insert two EX4600-EM-8F expansion modules, two QFX-EM-4Q expansion modules, or one of each. See Channelizing Interfaces for information on how to configure and channelize the 40-Gbps QSFP+ ports.
  • On a QFX5100-48S switch running a QFabric software package, PIC 0 can support 48 network access ports (10-Gigabit Ethernet ports) labeled 0 through 47, and PIC 1 can support 6 40-Gbps QSFP+ ports labeled 0 through 5. See Configuring the QSFP+ Port Type on QFX5100 Switches for information on how to configure the port mode of 40-Gbps QSFP+ ports.
  • On a QFX5100-24Q switch running Enhanced Layer 2 software, PIC 0 can support 24 40-Gbps QSFP+ ports labeled 0 through 23. PIC 1 and PIC 2 each support 4 40-Gbps QSFP+ port, for a total of eight 40-Gbps QSFP+ ports. See Channelizing Interfaces for information on how to configure and channelize the 40-Gbps QSFP+ ports.

    Note: You cannot channelize the 40-Gbps QSFP+ ports provided in the two QFX-EM-4Q expansion modules. Also, even though there is a total of 128 physical ports, only 104 logical ports can be channelized.

    You can configure different system modes to achieve varying levels of port density on the QFX5100-24Q and QFX5100-96S switches. Depending on the system mode you configure, there are restrictions on which ports you can channelize. If you channelize ports that are restricted, the configuration is ignored. See Configuring the System Mode for information on how to configure the system mode.

  • On a QFX5100-96S switch running Enhanced Layer 2 software, PIC 0 can support 96 10-Gigabit Ethernet ports labeled 0 through 95, and 8 40-Gbps QSFP+ ports labeled 96 through 103. See Channelizing Interfaces for information on how to configure and channelize the 40-Gbps QSFP+ ports.

    Note: You can only channelize the 40-Gbps QSFP+ ports provided in ports 96 and 100, because only 104 logical ports can be channelized.

    You can configure different system modes to achieve varying levels of port density on the QFX5100-24Q and QFX5100-96S switches. Depending on the system mode you configure, there are restrictions on which ports you can channelize. If you channelize ports that are restricted, the configuration is ignored. See Configuring the System Mode for information on how to configure the system mode.

Logical Part of an Interface Name on a Switch Running QFabric Software Package

The logical unit part of the interface name corresponds to the logical unit number, which can be a number from 0 through 16384. In the virtual part of the name, a period (.) separates the port and logical unit numbers: device-name (QFabric systems only): type-fpc/pic/port.logical-unit-number. For example, if you issue the show ethernet-switching interfaces command on a system with a default VLAN, the resulting display shows the logical interfaces associated with the VLAN:

Interface                State   VLAN members           Blocking
node-device1:xe-0/0/1.0  down     remote-analyzer        unblocked
node-device1:xe-0/0/2.0  down     default                unblocked
node-device1:xe-0/0/3.0  down     default                unblocked

When you configure aggregated Ethernet interfaces, you configure a logical interface, which is called a bundle or a LAG. Each LAG can include up to eight Ethernet interfaces, depending on the switch model.

Logical Part of a Channelized Interface Name on a Switch Running Enhanced Layer 2 Software

Channelizing enables you to configure four 10-Gigabit Ethernet interfaces from a 40-Gigabit Ethernet QSFP+ interface. By default, a 40-Gigabit Ethernet QSFP+ interface is named et-fpc/pic/port. The resulting 10-Gigabit Ethernet interfaces appear in the following format: xe-fpc/pic/port:channel, where channel can be a value of 0 through 3.

For example, if an et interface named et-0/0/3 is channelized to four 10-Gigabit Ethernet interfaces, the resulting 10-Gigabit Ethernet interface names will be xe-0/0/3:0, xe-0/0/3:1, xe-0/0/3:2, and xe-0/0/3:3:

Interface               Admin Link Proto    Local        Remote
xe-0/0/3:0               up    down
xe-0/0/3:1               up    down
xe-0/0/3:2               up    down
xe-0/0/3:3               up    down

Wildcard Characters in Interface Names

In the show interfaces and clear interfaces commands, you can use wildcard characters in the interface-name option to specify groups of interface names without having to type each name individually. You must enclose all wildcard characters except the asterisk (*) in quotation marks (" ").