Dynamic Routing Configuration Overview; Ospf Protocol Configuration Overview - Juniper NETWORK AND SECURITY MANAGER 2010.4 - CONFIGURING SCREENOS DEVICES GUIDE REV 01 Manual

Dynamic Routing Configuration Overview

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OSPF Protocol Configuration Overview

Copyright © 2010, Juniper Networks, Inc.
Destination-Based Routes Overview on page 307
Source Interface-Based Routes Overview on page 309
Dynamic Routing Configuration Overview on page 313
This topic describes the basic steps in configuring the following dynamic routing protocols:
"OSPF Protocol Configuration Overview" on page 313
RIP Overview on page 321
BGP Overview on page 327
Source Interface-Based Routes Overview on page 309
Configuring Route Preferences on page 312
The OSPF routing protocol operates within a single autonomous system (AS). A router
running OSPF distributes its state information (such as usable interfaces and neighbor
reachability) by periodically flooding link-state advertisements (LSAs) throughout the
AS.
Each OSPF router uses LSAs from neighboring routers to maintain a linkstate database,
a listing of topology and state information for the surrounding networks. The constant
distribution of LSAs throughout the routing domain enables all routers in an AS to maintain
identical link-state databases. OSPF uses the link-state database to determine the best
path to any network within the AS by generating a shortest-path tree (a graphical
representation of the shortest path to any network within the AS). While all routers have
the same link-state database, they all have unique shortest-path trees because a router
always generates the tree with itself at the top of the tree.
To enable OSPF on a security device, you must first enable OSPF on a virtual router, and
then enable OSPF on individual interfaces. You can also configure optional OSPF settings,
such as the following:
Global settings, such as virtual links, that are set at the VR level for the OSPF protocol.
Interface settings, such as authentication, that are set on a per-interface basis for the
OSPF protocol. When you configure an OSPF parameter at the interface level, the
parameter setting affects the OSPF operation only on the specific interface.
Additionally, you can set security-related OSPF settings at either the VR level or on a
per-interface basis. The following topics detail how to enable OSPF and configure all
optional parameters.
Chapter 10: Routing
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