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J-series Interface Naming Conventions

The unique name of each Services Router 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 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 channel number in the name, preceded by a colon (:):
Each logical interface has an additional logical unit identifier, preceded by a period (.):

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

Table 18: J-series Services Router Interface Names

Name Part	Meaning	Possible Values
type	Type of network medium that can connect to this interface.	at—ATM-over-ADSL or ATM-over-SHDSL WAN interface bc—Bearer channel on an ISDN BRI br—Basic Rate Interface for establishing ISDN connections ce1—Channelized E1 interface ct1—Channelized T1 interface dc—Delta channel on an ISDN BRI dl—Dialer interface for initiating ISDN and USB modem connections e1—E1 WAN interface e3—E3 WAN interface fe—Fast Ethernet interface ge—Gigabit Ethernet interface se—Serial interface (either RS-232, RS-422/499, RS-530, V.35, or X.21) t1—T1 (also called DS1) WAN interface t3—T3 (also called DS3) WAN interface vp—VoIP interface In addition to these network types, J-series routers can have the following special interfaces: dsc, gr and gre, ip and ipip, lo, ls and lsi, lt, mt and mtun, pd and pimd, pe and pime, pp0, sp, tap, and umd0. For more information, see Special Interfaces.
pim	Number of the chassis slot in which a PIM is installed.	On a J2300 router, always 0. On a J4300 or J6300 router, this number begins at 1 and increases from left to right, bottom to top to a maximum of 6. The PIM number 0 is reserved for the out-of-band management ports. (See Management Interface.) On a J4350 or J6350 router, this number begins at 1 and increases from top to bottom, left to right to a maximum of 6. The PIM number 0 is reserved for the out-of-band management ports. (See Management Interface.)
0	Number of the PIM installed in a chassis slot.	Always 0. Only one PIM can be installed in a slot.
port	Number of the port on a PIM on which the physical interface is located.	On a single-port PIM, 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. Port numbers appear on the PIM 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, except on a VoIP interface. A VoIP interface must have the logical interface number 0. If no logical interface number is specified, unit 0 is the default, but must be explicitly configured. For more information about logical interfaces, see Interface Logical Properties.

For example, the interface name e1-5/0/0:15.0 represents the following information:

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

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