Routing Engine Software Components | Juniper Networks G10 CMTS

JUNOSg Internet Software Overview

•
•	The Routing Engine software consists of several software processes that control router
•	functionality and a kernel that provides the communication among all the processes. This
•	section describes each of the Routing Engine software components:
•
•	! Routing Protocol Process on page 58
•
•	! Interface Process on page 60
•
•	! SNMP and MIB II Processes on page 60
•
•	! Management Process on page 60
•
•	! Routing Engine Kernel on page 60
•
•

•	The software routing protocol process controls the routing protocols that run on the CMTS.
•	The routing protocol process starts all configured routing protocols and handles all routing
•	messages. It maintains one routing table and consolidates the routing information learned
•	from all routing protocols into this common table. From this routing information, the routing
•	protocol process determines the active routes to network destinations and installs these
•	routes into the Routing Engine’s forwarding table. Finally, the routing protocol process
•	implements routing policy, which allows you to control the routing information that is
•	transferred between the routing protocols and the routing table. Using routing policy, you can
•	filter routing information so that only some of it is transferred, and you also can set
•	properties associated with the routes.
•
•	For complete information about the routing protocol process, including routing protocols,
•	routing and forwarding tables, routing policy, and interfaces, see the JUNOSg software
•	configuration guides.
•
•

•	The JUNOSg Internet software implements full IP routing functionality, providing support for
•	IP Version 4 (IPv4). The routing protocols are fully interoperable with existing IP routing
•	protocols, and provide the scale and control necessary for the Internet core. The software
•	provides support for the following routing and traffic engineering protocols:
•
•	! OSPF—Open Shortest Path First, Version 2, is an IGP that was developed for IP networks
•	by the Internet Engineering Task Force (IETF). OSPF is a link-state protocol that makes
•	routing decisions based on the SPF algorithm.
•
•	! RIP—Routing Information Protocol, Version 2, is an IGP for IP networks based on the
•	Bellman-Ford algorithm. RIP is a distance-vector protocol. The JUNOSg RIP software is
•	compatible with RIP Version 1.
•
•	! ICMP—Internet Control Message Protocol router discovery allows hosts to discover the
•	addresses of operational routers on the subnet.
•
•
•
•
•
•

58	JUNOSg 3.0 G10 CMTS Hardware Guide