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