I found most of this on a web page somewhere tha tI can’t seem to find again. Below are some common useful junos tidbits regarding routing tables and interface types/names:
JunOS CLI supports the basic grep command (like | include) so any show commands can be grepped. I believe the grep command implies the -i flag for case insensitivity.
The routing table is presented in such a way to group types of routes.
**inet.0 is the ipv4 unicast routing table
**
**inet.1 is the ipv4 multicast routing table
**
**inet.3 is the MPLS routing table
**
inet6.0 is the ipv6 routing table
Juniper interface types
Most common ones you’ll probably see:
**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.
xe: 1GE optical interface on ex switches
ge: Gigabit and 10gigabit Ethernet. Includes Gigabit Ethernet IQ interfaces.
me0: - out of band management interface on ex switches
lo: Loopback This interface is internally generated. The logical interface lo0.16383 is a non-configurable interface for routing platform control traffic.
vcp: - virtual chassis interface (EX4200 only)
Other ones you may run into:
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.
**
**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.
**
**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.
**
**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.
**
**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.
**
Other interesting terminology regarding the juniper architecture is the module layout:
**RE: Routing Engine, Like a cisco supervisor module. Central brains of the system
**
**PFE: Packet forwarding Engine. Controls the data packet forwarding of the system.
**
**SCB: Switch control board. Contains ASICs that handle route lookups and memory management.
**
**PIC: Physical interface card. Sort of like a port, but can contain multiple interfaces.
**
FPC: Flexible PIC concentrator. Like a linecard that has module slots. Can handle different types of PICs
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