Juniper CBL-M40-PWR-AU ユーザーズマニュアル
Routing Engine Software Components
M40 Internet Router Hardware Guide
26
Routing Engine Software Components
The Routing Engine software consists of several software processes that control router
functions and a kernel that coordinates communication among the processes, as described
in the following sections:
functions and a kernel that coordinates communication among the processes, as described
in the following sections:
Routing Protocol Process
The JUNOS software routing protocol process controls the routing protocols that run on the
router. The routing protocol process starts all configured routing protocols and handles all
routing messages. It consolidates the routing information learned from all routing protocols
into common routing tables. 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 the
routing policies you specify, which determine how routing information is transferred between
the routing protocols and the routing table.
router. The routing protocol process starts all configured routing protocols and handles all
routing messages. It consolidates the routing information learned from all routing protocols
into common routing tables. 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 the
routing policies you specify, which determine how routing information is transferred between
the routing protocols and the routing table.
This section discusses the following topics:
For complete information about routing concepts, see the JUNOS Internet software
configuration guides.
configuration guides.
Routing Protocols
The JUNOS Internet software implements full IP routing functionality, providing support for
IP Version 4 (IPv4) and IP Version 6 (IPv6). 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:
IP Version 4 (IPv4) and IP Version 6 (IPv6). 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:
Unicast routing protocols
BGP—Border Gateway Protocol, Version 4, is an Exterior Gateway Protocol (EGP)
that guarantees loop-free exchange of routing information between routing
domains (also called autonomous systems). BGP, in conjunction with JUNOS routing
policy, provides a system of administrative checks and balances that can be used to
implement peering and transit agreements.
that guarantees loop-free exchange of routing information between routing
domains (also called autonomous systems). BGP, in conjunction with JUNOS routing
policy, provides a system of administrative checks and balances that can be used to
implement peering and transit agreements.
ICMP—Internet Control Message Protocol Router Discovery is a method that hosts
can use to discover the addresses of operational routers on a subnet.
can use to discover the addresses of operational routers on a subnet.