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JUNOS Internet Software Over view
by a VPN customer with connections to several various ISPs, or different
connections to the same ISP in various geographic regions.
Carrier-of-Carrier VPNs—Carrier-of-carrier VPNs allow a VPN service provider
to supply VPN service to a customer who is also a service provider. The latter
service provider supplies Internet or VPN service to an end customer.
Interface Process
The JUNOS interface process manages the physical interface devices and logical
interfaces on the router. It implements the JUNOS command-line interface
(CLI) commands and configuration statements t hat you use to specify interface
properties such as location (FPC location in the FPC card cage and PIC location
on an FPC), the interface type (such as SONET/SDH or ATM), encapsulation,
and interface-specific properties. You can configure both interfaces that are
currently active and interfaces that might be installed later.
The JUNOS interface process communicates with the interface process in the
Packet Forwarding Engine through the JUNOS kernel, enabling the JUNOS Internet
software to track the status and condition of router interfaces.
Chassis Process
The JUNOS chassis process allows you to configure and control the properties of
the router, including conditions that trigger alarms and clock sources. The chassis
process communicates directly with a chassis process in the JUNOS k ernel.
SNMP and MIB II Processes
The JUNOS Internet software supports the Simple Network Management
Protocol (SNMP), versions 1, 2, and 3, which provides a m echanism for
monitoring the state of the router. This software is controlled by the JUNOS
SNMP and Management Information Base (MIB) II processes, which consist
of an SNMP master agent and a MIB II agent.
Management Process
The management process starts all the other JUNOS software processes and the
CLI when the router boots. It monitors the running JUNOS processes and makes
all reasonable attempts to restart any process that terminates.
Routing Engine Kernel
The Routing Engine kernel provides the underlying infrastructure for all JUNOS
software processes. It also pro vides the link between the routing tables maintained
by the routing protocol process and the forwarding table maintained by the Routing
Engine. Additionally, it coordinates communication with the Packet Forwarding
Engine, which primarily involves synchronizing the Packet Forwarding Engine’s
forwarding table with the master forwarding table maintained by the Routing Engine .
Routing Engine Software Components 49