Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

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Table 9: OSPF-Related Terms (continued)
Meaning Term
The method by which authentication is achieved—null (or none),
simple, or MD5. For example, simple authentication requires a 64-bit
password in each OSPF packet. authentication type
A set of networks or IP prefixes within a single routing policy domain. autonomous system
(AS)
An OSPF router that redistributes routing information from other
routing protocol sources. autonomous system
boundary router (AS
boundary router)
An addressing method that replaces the traditional class structure of
IP addresses. In CIDR, the boundary between the network and host
portions of an IP address can be on any bit boundary. CIDR addresses
have no class restrictions, enabling more efficient used of the IP
address space. CIDR addresses are represented by a prefix and a
notation that indicates the IP address and mask; for example,
10.12.8.3/16. classless interdomain
routing (CIDR)
A designated device (OSPF router) with which other routers form
adjacencies, reducing the number of adjacencies required on a
broadcast or NBMA network. designated router
A collection of routers that use a common interior gateway protocol. domain
The distribution and synchronization of the link-state database between
OSPF routers. flooding
A protocol that establishes and maintains neighbor relationships and
that communication between neighbors is bidirectional. The hello
protocol also dynamically discovers neighboring routers on broadcast
or point-to-point networks. hello protocol
A routing protocol that routers within an AS use to exchange
information. interior gateway
protocol (IGP)
A unit of data that describes the local state of a router or network.
LSAs are flooded throughout their respective flooding domains. For
example, router LSAs are flooded within the area to which the router
belongs, summary LSAs are flooded to other areas through the
backbone, and external LSAs are flooded throughout the OSPF domain. link-state advertisement
(LSA)
Overview
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Chapter 5: Configuring OSPF