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Interfaces and Interface Naming

The interfaces on a Services Router are used for networking and services. Most interfaces are configurable, but some internally generated interfaces are not configurable. Each interface has a unique name that 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 interface on the router has the following format, to identify the physical device that corresponds to a single physical network connector:
Network interfaces that are fractionalized into time slots include a virtual DS0 channel number in the name, preceded by a colon (:):
Each logical interface has an additional logical unit identifier, preceded by a period (.):

For example, e1-5/0/0 is the E1 interface on port 0 of FPC 5, e1-5/0/0:15 is channel 15 on that interface, and e1-5/0/0:15.0 is logical unit 0 on that channel.

The parts of an interface name are explained in Table 18.

Table 18: Interface Name Information

Interface Name Part	Meaning	Possible Values
type	Type of network medium that can connect to this interface.	at—Asynchronous Transfer Mode (ATM) for ADSL WAN interface. dsc—Virtual interface that discards packets. e1—E1 WAN interface. fe—Fast Ethernet LAN interface. gr, gre—Generic routing encapsulation (GRE) interface for tunnel services. This interface is internally generated and not configurable. ip, ipip—IP-over-IP interface. This interface is internally generated and not configurable. ls—Link services interface. lsi—Label-switched interface. This interface is internally generated and is not configurable. lo—Loopback interface. This interface is internally generated and also configurable. mtun—Multicast GRE interface. This interface is internally generated and not configurable. pd, pimd—Protocol Independent Multicast (PIM) decapsulator interface. This interface is internally generated and not configurable. pe, pime—PIM encapsulator interface. This interface is internally generated and not configurable. se—Serial interface (including RS-232, RS-422/449, RS-530, V.35, and X.21 interfaces). sp—Services interface. t1—T1 (also called DS1) WAN interface. t3—T3 (also called DS3) WAN interface. tap—This interface is internally generated and not configurable.
FPC	The number of the Flexible PIM concentrator (FPC) on which the physical interface is located.	On a J2300 router, always 0. On a J4300 or J6300 router, a value from 0 through 6.
PIM	The number of the PIM on which the physical interface is located. For Services Router interfaces, the FPC and PIM are the same physical unit, so the PIM has no number of its own.	Always 0.
port	The number of the port on a PIM on which the physical interface is located.	Either 0 or 1.
channel	The number of the channel (time slot) on a fractional T1 or E1 interface.	On an E1 interface, a value from 0 through 32. The 0 and 1 time slots are reserved. On a T1 interface, a value from 0 through 24. The 0 time slot is reserved.
logical unit	The number of the logical unit created on the physical interface.	A value from 0 through 16384.

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