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Tools for M onitor
ing the Software
Management Process
The managemen
t 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 Engin
eKernel
The Routing Engine kernel provides the underlying infrastructure for all JUNOS software
processes. I
t 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
synchronizi
ng the Packet Forwarding Engine’s forwarding table with the master forwarding
table maintained by the Routing Engine.
Tools for Accessing and Configuring the Software
The JUNOS CLI is the primary tool for accessing and controlling the JUNOS Internet software.
You use it when accessing the router through the console or a connection to an out-of-band
management
network. The CLI includes commands for configuring router hardware, the
JUNOS Internet software, and network connectivity.
The JUNOS C
LI is a straightforward command interface. You type commands on a single line
and enter the commands by pressing the Enter key. The CLI provides command help and
command completion, as well as Emacs-style keyboard sequences for moving around on a
command li
ne and scrolling through a buffer that contains recently executed commands.
For more information about the CLI, see the JUNOS Internet Software Configuration Guide:
Getting Started.
Tools for
Monitoring the Software
In addition to commands for configuring router hardware and software, the CLI includes
commands
for monitoring and troubleshooting hardware, software, routing protocols, and
network conn ectivity. CLI commands display information from routing tables, information
specific to routing protocols, and information about network connectivity derived from
the ping
and traceroute utilities.
You can also use the JUNOS Internet software implementation of SNMP to monitor routers.
The SNMP
software consists of an SNMP master agent and a M IB II agent. It provides full
support for MIB II SNMP version 1 traps and version 2 notifications, SNMP version 1 Get and
GetNext requests, and version 2 GetBulk requests. For more information about SNMP, see
the JUNO
S Internet Software Configuration Guide: Network Management.
The software also supports tracing and logging operations, which you can use to track normal
router o
perations, error c onditions, and the packets that the router generates or forwards.
Logging operations use a syslog-like mechanism to record systemwide, high-level events such
as interfaces going up or down and user logins on the router. Tracing operations record more
detail
ed information about the operation of routing protocols, such as the various types of
routing protocol packets sent and received, and routing policy actions.
JUNOS Internet Software Overview
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