Interface Naming Conventions

Each device interface has a unique name that follows a naming convention. If you are familiar with Juniper Networks M Series and T Series routing platforms, be aware that device interface names are similar to but not identical with the interface names on those routing platforms.

The unique name of each network interface identifies its type and location and indicates whether it is a physical interface or an optional logical unit created on a physical interface:

The name of each network interface has the following format to identify the physical device that corresponds to a single physical network connector:
type-slot/pim-or-ioc/port
Network interfaces that are fractionalized into time slots include a channel number in the name, preceded by a colon (:):
type-slot/pim-or-ioc/port:channel
Each logical interface has an additional logical unit identifier, preceded by a period (.):
type-slot/pim-or-ioc/port:<channel>.unit

The parts of an interface name are summarized in Table 7.

Table 7: Network Interface Names

Name Part	Meaning	Possible Values
type	Type of network medium that can connect to this interface.	See Network Interfaces, Special Interfaces, and Services Interfaces.
slot	Number of the chassis slot in which a PIM or IOC is installed.	J Series Services Router: The slot number begins at 1 and increases as follows from top to bottom, left to right: J2320 router—Slots 1 to 3 J2350 router—Slots 1 to 5 J4350 or J6350 router—PIM slots 1 to 6 The slot number 0 is reserved for the out-of-band management ports. SRX5600 and SRX5800 devices: The slot number begins at 0 and increases as follows from left to right, bottom to top: SRX5600 device—Slots 0 to 5 SRX5800 device—Slots 0 to 5, 7 to 11 SRX3400 and SRX3600 devices: The Switch Fabric Board (SFB) is always 0. Slot numbers increase as follows from top to bottom, left to right: SRX3400 devce—Slots 0 to 4 SRX3600 device—Slots 0 to 6
pim-or-ioc	Number of the PIM or IOC on which the physical interface is located.	J Series devices: This number is always 0. Only one PIM can be installed in a slot. SRX5600 and SRX5800 devices: For 40-port Gigabit Ethernet IOCs or 4-port 10-Gigabit Ethernet IOCs, this number can be 0, 1, 2, or 3. SRX3400 and SRX3600 devices: This number is always 0. Only one IOC can be installed in a slot.
port	Number of the port on a PIM or IOC on which the physical interface is located.	J Series Services Routers: On a single-port PIM, the number is always 0. On a multiple-port PIM, this number begins at 0 and increases from left to right, bottom to top, to a maximum of 3. On SRX5600 and SRX5800 devices: For 40-port Gigabit Ethernet IOCs, this number begins at 0 and increases from left to right to a maximum of 9. For 4-port 10-Gigabit Ethernet IOCs, this number is always 0. On SRX3400 and SRX3600 devices: For the SFB built-in copper Gigabit Ethernet ports, this number begins at 0 and increases from top to bottom, left to right, to a maximum of 7. For the SFB built-in fiber Gigabit Ethernet ports, this number begins at 8 and increases from left to right to a maximum of 11. For 16-port Gigabit Ethernet IOCs, this number begins at 0 to a maximum of 15. For 2-port 10-Gigabit Ethernet IOCs, this number is 0 or 1. Port numbers appear on the PIM or IOC faceplate.
channel	Number of the channel (time slot) on a fractional or channelized T1 or E1 interface.	On an E1 interface, a value from 1 through 31. The 1 time slot is reserved. On a T1 interface, a value from 1 through 24.
unit	Number of the logical interface created on a physical interface.	A value from 0 through 16384. If no logical interface number is specified, unit 0 is the default, but must be explicitly configured.

For example, the interface name e1-5/0/0:15.0 on a J Series Services Router represents the following information:

E1 WAN interface
PIM slot 5
PIM number 0 (always 0)
Port 0
Channel 15
Logical interface, or unit, 0

Interface Naming Conventions

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