Interface Naming Conventions Used in JUNOS Operational Commands

This topic explains the interface naming conventions used in JUNOS operational commands, and contains the following sections:

• Physical Part of an Interface Name
• Logical Part of an Interface Name
• Channel Identifier Part of an Interface Name

Physical Part of an Interface Name

The M-series and T-series routing platforms use one convention for interface naming, whereas the J-series routing platform uses another.

• M-series and T-series interface names—On the M-series and T-series platforms, when you display information about an interface, you specify the interface type, the slot in which the Flexible PIC Concentrator (FPC) is installed, the slot on the FPC in which the PIC is located, and the configured port number.

  In the physical part of the interface name, a hyphen (-) separates the media type from the FPC number, and a slash (/) separates the FPC, PIC, and port numbers:

  type-fpc/pic/port

Note: Exceptions to the type-fpc/pic/port physical description include the aggregated Ethernet and aggregated SONET/SDH interfaces, which use the syntax aenumber and asnumber, respectively.

• J-series interface names—On the J-series routing platform, when you display information about an interface, you specify the interface type, the slot in which the Physical Interface Module (PIM) is installed, 0, and the configured port number.

  In the physical part of the interface name, a hyphen (-) separates the media type from the PIM number, and a slash (/) separates the PIM, 0, and port numbers:

  type-pim/0/port

Note: An exception to the type-pim/0/port physical description is the Integrated Services Digital Network (ISDN) dialer interface, which uses the syntax dlnumber.

Logical Part of an Interface Name

The logical unit part of the interface name corresponds to the logical unit number, which can be a number from 0 through 16,384. In the virtual part of the name, a period (.) separates the port and logical unit numbers:

• M-series and T-series routing platforms:

  type-fpc/pic/port.logical

• J-series routing platform:

  type-pim/0/port.logical

Channel Identifier Part of an Interface Name

The channel identifier part of the interface name is required only on channelized interfaces. For channelized interfaces, channel 0 identifies the first channelized interface. For channelized intelligent queuing (IQ) interfaces, channel 1 identifies the first channelized interface.

Note: Depending on the type of channelized interface, up to three levels of channelization can be specified. For more information, see the JUNOS Network Interfaces Configuration Guide.

A colon (:) separates the physical and virtual parts of the interface name:

• M-series and T-series routing platforms:

  type-fpc/pic/port:channel

  type-fpc//pic/port:channel:channel

  type-fpc/pic/port:channel:channel:channel

• J-series routing platforms:

  type-pim/0/port:channel

  type-pim/0/port:channel:channel

  type-pim/0/port:channel:channel:channel

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