Ipv6 Routing Protocols; Routing And Forwarding Tables - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
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MPLS—Multiprotocol Label Switching enables you to configure LSPs through a
network either manually or dynamically. You can control how traffic traverses the
network by directing it through particular paths, rather than relying on an IGP's
least-cost algorithm to choose a path.
RSVP—Resource Reservation Protocol, version 1, provides a mechanism for
engineering network traffic patterns that is independent of the shortest path
determined by a routing protocol. RSVP itself is not a routing protocol, but is designed
to operate with current and future unicast and multicast routing protocols. Junos
RSVP software supports dynamic signaling for MPLS LSPs.

IPv6 Routing Protocols

The Junos OS implements full IP routing functionality, providing support for 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 unicast routing protocols:
BGP—Border Gateway Protocol, version 4, is an 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.
ICMP—Internet Control Message Protocol router discovery is a method that hosts can
use to discover the addresses of operational routers on a subnet.
IS-IS—Intermediate System-to-Intermediate System is a link-state interior gateway
protocol (IGP) for IP networks that uses the shortest-path-first algorithm (SPF
algorithm, also called the Dijkstra algorithm) to determine routes.
OSPF—Open Shortest Path First, version 3 (OSPFv3), supports version 6 of the Internet
Protocol (IPv6). The fundamental mechanisms of OSPF such as flooding, Designated
Router (DR) election, area based topologies and the Shortest Path First (SPF)
calculations remain unchanged. Some differences exist either due to changes in protocol
semantics between IPv4 and IPv6, or to handle the increased address size of IPv6.
RIP—Routing Information Protocol, version 2, is an IGP for IP networks based on the
Bellman-Ford algorithm. RIP is a distance-vector protocol. RIP dynamically routes
packets between a subscriber and a service provider without the subscriber having to
configure BGP or to participate in the service provider's IGP discovery process.

Routing and Forwarding Tables

The primary function of the Junos routing protocol process is maintaining routing tables
and using the information in them to determine active routes to network destinations. It
copies information about the active routes into the Routing Engine's forwarding table,
which the Junos kernel copies to the Packet Forwarding Engine.
By default, the routing protocol process maintains the following routing tables and uses
the information in each table to determine active routes to network destinations:
Unicast routing table—Stores routing information for all unicast protocols running on
the router, including BGP, IS-IS, OSPF, and RIP. You can also configure additional
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