Example: Ospf - McAfee SG310 Administration Manual

Network Setup menu options
Routes

Example: OSPF

OSPF stands for Open Shortest Path First, and some of its principal features as follows:
• Networks are grouped by areas, which are interconnected by a backbone area which will be designated
as area 0. All traffic goes through area 0, and all the routers in area 0 have routing information about all
the other areas.
• Routes are propagated very fast, compared with RIP, for example.
• OSPF uses multicasting instead of broadcasting, so it doesn't flood other hosts with routing information
that may not be of interest for them, thus reducing network overhead. Also, Internal Routers (those which
only have interfaces in one area) don't have routing information about other areas. Routers with
interfaces in more than one area are called Area Border Routers, and hold topological information about
the areas they are connected to.
• OSPF is based on Dijkstra's Shortest Path First algorithm, which is CPU-intensive compared to other
routing algorithms.
• OSPF counts with the special characteristics of networks and interfaces, such as bandwidth, link failures,
and monetary cost.
This example is adapted from the LARTC (Linux Advanced Routing & Traffic Control) dynamic routing
howto, available from: http://lartc.org/howto/. LARTC is an invaluable resource for those wanting to learn
about and take advantage of the advanced routing capabilities of Linux systems.
In this example, route management is set up using OSPF for the network topology described by
Figure 117 OSPF network example
The UTM Firewall is configured to exchange routes with the routers named Atlantis, Legolas and Frodo.
Ensure you have enabled OSPF under Route Management, then open zebra.conf and ospfd.conf for
1
editing as described in
In , enter:
2
zebra.conf
hostname sg
! Uncomment and set telnet/vty passwords to enable telnet access on port 2602
#password changeme
#enable password changeme
# Enable multicast for OSPF
interface eth1
McAfee UTM Firewall 4.0.4 Administration Guide
Manually configuring route management.
Figure 117.
115