Interface Naming Conventions Used in the JUNOS Software Operational Commands
This topic explains the interface naming conventions used in the JUNOS Software 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 Multiservices Edge Routers and the T Series Core Routers use one convention for interface naming, whereas the J Series Services Routers and the SRX Series Services Gateways use another.
- M Series and T Series interface names—On
the M Series and T Series routers, 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 and SRX interface names—On
J Series and SRX devices, the unique 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
For more information about J Series and SRX interface naming conventions, see the JUNOS Software Interfaces and Routing Configuration Guide.
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 routers:type-fpc/pic/port.logical
- J Series and SRX devices: type-slot/pim-or-ioc/port:channel.unit
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 routers:type-fpc/pic/port:channeltype-fpc//pic/port:channel:channeltype-fpc/pic/port:channel:channel:channel
- J Series and SRX devices:type-slot/pim-or-ioc/port:channel type-slot/pim-or-ioc/port:channel:channel type-slot/pim-or-ioc/port:channel:channel:channel
