M160 Internet Router Hardware Guide
VPNs on page 48
Interface Process on page 49
Chassis Process on page 49
SNMP and MIB II Processes onpage 49
Management Process on page 49
Routing Engine Kernelon page 49
Routing Protocol Process
The JUNOS software routingprotocol process controls the routing protocols that
run on the router. The routing protocol processstarts all configured routing
protocols and handles allrouting messages. It consolidates the routing information
learned from all routing protocols into common routing tables. From this routing
information, the routing protocol process determ ines the active routes to network
destinations and installs these routes into the Rou ting Engine’s forwarding table.
Finally,the routing protocol process implements the routing policies youspecify,
which determine how routing information is transferred between the routing
protocols and the routing table.
This section discusses the following topics:
IPv4 Routing Protocols on page 44
IPv6 Routing Protocols on page 46
Routing and Forwarding Tableson page 4 7
Routing Policyon page 47
For complete information about routingconcepts, see the JUNOS
Internet software configuration guid es.
IPv4 Routing Protocols
The JUNOS Internet software implements full IP routing functionality,
providing support for IP version 4 (IPv4). The routing protocols are full y
interoperable with existingIP routing protocols and provide the scale and
control necessary for the Internet core. The software providessupport for
the following routing and trafficengineering protocols:
Unicast routing protocols
BGP—BorderGateway Protocol, version 4, is an Exterior GatewayProtocol
(EGP) that guarantees loop-freeexchange of routing information between
routing domains (also called autonomoussystems). BGP,in conjunction
44 Routing Engine Software Components