Juniper CBL-M40-PWR-AU 사용자 설명서
JUNOS Internet Software Overview
Routing Engine Software Components
29
Routing policy enables you to control (filter) which routes are imported into the routing table
and which routes are exported from the routing table. Routing policy also allows you to set
the information associated with a route as it is being imported into or exported from the
routing table. Routing policies applied to imported routes control the routes used to
determine active routes, whereas policies applied to exported routes control which routes a
protocol advertises to its neighbors.
and which routes are exported from the routing table. Routing policy also allows you to set
the information associated with a route as it is being imported into or exported from the
routing table. Routing policies applied to imported routes control the routes used to
determine active routes, whereas policies applied to exported routes control which routes a
protocol advertises to its neighbors.
You implement routing policy by defining policies. A policy specifies the conditions to use to
match a route and the action to perform on the route when a match occurs. For example,
when a routing table imports routing information from a routing protocol, a routing policy
might modify the route’s preference, mark the route with a color to identify it for later
manipulation, or prevent the route from even being installed in a routing table. When a
routing table exports routes to a routing protocol, a policy might assign metric values, modify
the BGP community information, tag the route with additional information, or prevent the
route from being exported altogether. You also can define policies for redistributing the
routes learned from one protocol into another protocol.
match a route and the action to perform on the route when a match occurs. For example,
when a routing table imports routing information from a routing protocol, a routing policy
might modify the route’s preference, mark the route with a color to identify it for later
manipulation, or prevent the route from even being installed in a routing table. When a
routing table exports routes to a routing protocol, a policy might assign metric values, modify
the BGP community information, tag the route with additional information, or prevent the
route from being exported altogether. You also can define policies for redistributing the
routes learned from one protocol into another protocol.
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 that 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 router. It implements the JUNOS command-line interface (CLI) commands and
configuration statements that 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.
Forwarding Engine through the JUNOS kernel, enabling the JUNOS Internet software to track
the status and condition of router interfaces.
SNMP and MIB II Processes
The JUNOS Internet software supports the Simple Network Management Protocol (SNMP),
Versions 1 and 2, which provides a mechanism 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.
Versions 1 and 2, which provides a mechanism 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.
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 provides 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.
processes. It also provides 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.