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M160 Internet Router Hardware Guide
paths. LSPs created by LDP can also traverse LSPs created by Resource
Reservation Protocol (RSVP).
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 P rotocols
The JUNOS Internet software 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-F ord 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 p articipate in the service
provider’s IGP discovery process.
46 Routing Engine Software Components