A collection of files that make up a JUNOS software component.
Packet Forwarding Engine
The architectural portion of the router that processes packets by forwarding them between input and output interfaces.
path attribute
Information about a BGP route, such as the route origin, AS path, and next -hop router.
PCI
Peripheral Component Interconnect. Standard, high-speed bus for connecting computer peripherals. Used on the Routing Engine.
PCMCIA
Personal Computer Memory Card International Association. Industry group that promotes standards for credit card-size memory or I/O devices.
PDU
Protocol data unit. IS-IS packets.
PE router
Provider edge router. A router in the service provider's network that is connected to a customer edge (CE) device and that participates in a Virtual Private Network (VPN).
PEC
Policing Equivalence Classes. In traffic policing, a set of packets that is treated the same by the packet classifier.
peer
An immediately adjacent router with which a protocol relationship has been established. Also called a neighbor.
PFE
See [Packet Forwarding Engine]
Physical Interface Card
See [PIC]
PIC
Physical Interface Card. A network interface “specific card that can be installed on an FPC in the router.
PIM
Protocol Independent Multicast. A protocol-independent multicast routing protocol. PIM sparse mode routes to multicast groups that might span wide-area and interdomain internets . PIM dense mode is a flood-and-prune protocol.
PLP
Packet loss priority.
policing
Applying rate limits on bandwidth and burst size for traffic on a particular interface.
pop
Removal of the last label, by a router, from a packet as it exits an MPLS domain.
PPP
Point-to-Point Protocol. Link-layer protocol that provides multiprotocol encapsulation. It is used for link-layer and network-layer configuration.
preference
Desirability of a route to become the active route. A route with a lower preference value is more likely to become the active route. The preference is an arbitrary value in the range 0 through 255 that the routing protocol process uses to rank routes received from different protocols, interfaces, or remote systems.
preferred address
On an interface, the default local address used for packets sourced by the local router to destinations on the subnet.
primary address
On an interface, the address used by default as the local address for broadcast and multicast packets sourced locally and sent out the interface.
primary interface
Router interface that packets go out from when no interface name is specified and when the destination address does not imply a particular outgoing interface.
Protocol-Independent Multicast
See [PIM]
provider edge router
See [PE router]
provider router
Router in the service provider's network that does not attach to a customer edge (CE) device.
PSNP
Partial sequence number PDU. Packet that contains only a partial list of the LSPs in the IS-IS link-state database.
push
Addition of a label or stack of labels, by a router, to a packet as it enters an MPLS domain.
