ospf

Juniper ScreenOS : default route manipulations and redistributions

The default route or “route of last resort” is an important route in most present inter-network connectivity configurations. It contains all public and private routes possible and is responsible for directing traffic to a next hop when no better route is found.  In most cases, it is used to allow networks to access the internet, […]

Juniper Screenos : Redundant multi-exitpoint ISP routing failover using multiple vrouters, multiple OSPF areas and eBGP

Introduction As you most likely already know, Juniper screenOS supports a couple of dynamic routing protocols (OSPF, BGP, RIP).  These protocols can be used to build very powerful and redundant networks,  however there are some screenos specific issues with these implementations, and these issues may introduce a little bit of complexity in the design and […]

Using Fedora 9 as an OSPF / BGP router (Quagga / Zebra) and set up BGP between Linux and Juniper ScreenOS

In this post, I’m going to show you how to set up a Linux host (Fedora Core 9) and use it as a BGP enabled router.  In order to fully understand the setup & configuration, please have a look at this blog post first, because I’ll use the setup in that post as a foundation […]

Juniper ScreenOS BGP Basics : a simple iBGP test case

As explained in one of my earlier posts, ScreenOS supports a couple of ways to provide for dynamic routing. Today, I’m going to explain some basic implementations of BGP on ScreenOS. Unlike my post on OSPF, I won’t be going too much into all the details of what BGP is and how it works, but […]

Using OSPF on Juniper Netscreen Firewalls

Introduction to OSPF OSPF is a link-state (dynamic) routing protocol that operates within an autonomous system. OSPF falls within the group of Interior Gateway Protocols. Devices that use OSPF will advertise link state information. The devices generate Link State Advertisements (LSA’s) for directly connected links, and will forward LSAs received from other devices to ensure […]

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