Macro 32 Ramblings

Background

Junos has many pseudo interfaces that perform various functions such as encapsulation, decapsulation and even virtual chassis connects. This document is a list of the virtual interfaces and their purpose. This is a work in progress. These are the same descriptions as found here Link but I have added additional descriptions and interfaces.

Interfaces

ae Aggregated Ethernet A virtual aggregated link.
as Aggregated SONET/SDH A virtual aggregated link.
at ATM1 or ATM2 IQ Asynchronous Transfer Mode
cau4 Channelized AU-4 IQ Configured on the Channelized STM-1 IQ PIC.
coc1 Channelized OC-1 IQ Configured on the Channelized OC-12 IQ PIC.
coc12 Channelized OC-12 IQ Configured on the Channelized OC-12 IQ PIC.
cstm1 Channelized STM-1 IQ Configured on the Channelized STM-1 IQ PIC.
ce1 Channelized E1 IQ Configured on the Channelized E1 IQ PIC or Channelized
STM-1 IQ PIC.
ct1 Channelized T1 IQ Configured on the Channelized DS-3 IQ PIC or
Channelized OC-12 IQ PIC.
ct3 Channelized T3 IQ Configured on the Channelized DS-3 IQ PIC or
Channelized OC-12 IQ PIC.
cp Collector Configured on the Monitoring Services II PIC.
ds DS-0 Configured on the Channelized DS-3 to DS-0 PIC,
Channelized E1 PIC, Channelized OC-12 IQ PIC,
dsc Discard Allows you to identify the ingress point of a
denial-of-service (DoS) attack.
e1 E1 Includes the channelized STM-1 to E1 interfaces.
e3 E3 Includes the E3 IQ interfaces.
es Encryption Allows you to configure a security association (SA) name
with a logical interface.
fe Fast Ethernet 100Base-TX (Fast Ethernet, 100 Mbps).
fxp0 Management and internal Ethernet The management Ethernet interface is an out-of-band
management interface within the routing platform.
fxp1  Interface that connects the routing engine and packet forwarding engine.
ge Gigabit Ethernet Includes Gigabit Ethernet IQ interfaces.
gr Generic Route Encapsulation tunnel Allows you to configure a unicast tunnel using GRE
encapsulation.
gre Internally generated This interface is internally generated and is not
configurable.
ip IP-over-IP encapsulation tunnel Allows you to configure a unicast tunnel using IP-IP
encapsulation.
ipip Internally generated This interface is internally generated and is not
configurable.
lo Loopback This interface is internally generated. The logical
interface lo0.16383 is a non-configurable interface for
routing platform control traffic.
ls Link services Supports bundles that contain links.
lsi Internally generated This interface is internally generated and is not
configurable.
ml Multilink Includes Multilink Frame Relay and Multilink PPP.
mo Monitoring services Includes the monitoring services and monitoring services
II interfaces. The logical interface mo-fpc/pic/port.16383
is an internally generated, non-configurable interface for
routing platform control traffic.
mt Multicast tunnel Internal routing platform interface for VPNs.
mtun Internally generated This interface is internally generated and is not
configurable.
me0 – out of band management interface on ex switches
oc3 OC-3 IQ Configured on the Channelized OC-12 IQ PIC.
pe This interface is present on the first-hop routing
platform. Encapsulates packets destined for the rendezvous point
(RP) routing platform.
pd This interface is present on the RP De-encapsulates packets at the RP.
pimd Internally generated This interface is internally generated and is not
configurable.
pime Internally generated This interface is internally generated and is not
configurable.
rlsq – a redundant bundle interface, made of two or more lsq interface. If you have redundant AS Pics.
se Serial Includes the EIA-530, V.35, and X.21 interfaces.
so SONET/SDH Both are widely used methods for very high speed
transmission of voice and data signals across the
numerous world-wide fiber-optic networks.
sp Adaptive services The logical interface sp-fpc/pic/port.16383 is an
internally generated, non-configurable interface for
routing platform control traffic.
t1 T1 Includes the channelized DS-3 to DS-1 interfaces.
t3 T3 Includes the channelized OC-12 to DS-3 interfaces.
tap Internally generated This interface is internally generated and is not
configurable.
vcp – virtual chassis interface (EX4200 only)
vsp Voice services The Adaptive Services (AS) Physical Interface Card (PIC)
supports the compressed real-time transport protocol
(RTP) on this interface.
vt Virtual loopback tunnel On routing platforms equipped with a Tunnel PIC,
enables egress filtering.
xe – 1GE optical interface on ex switches