Chapter 10 Routing
USG20(W)-VPN Series User’s Guide
239
10.5 Routing Protocols Overview
Routing protocols give the USG routing information about the network from other routers. The USG
stores this routing information in the routing table it uses to make routing decisions. In turn, the
USG can also use routing protocols to propagate routing information to other routers.
Routing protocols are usually only used in networks using multiple routers like campuses or large
enterprises.
• Use the
RIP
screen (see
) to configure the USG to use RIP to receive
and/or send routing information.
• Use the
OSPF
) to configure general OSPF settings and
manage OSPF areas.
• Use the
OSPF Area Add/Edit
screen (see
) to create or edit an OSPF
area.
10.5.1 What You Need to Know
The USG supports two standards, RIP and OSPF, for routing protocols. RIP and OSPF are compared
here and discussed further in the rest of the chapter.
Finding Out More
See
for background information on routing protocols.
10.6 The RIP Screen
RIP (Routing Information Protocol, RFC 1058 and RFC 1389) allows a device to exchange routing
information with other routers. RIP is a vector-space routing protocol, and, like most such
protocols, it uses hop count to decide which route is the shortest. Unfortunately, it also broadcasts
its routes asynchronously to the network and converges slowly. Therefore, RIP is more suitable for
small networks (up to 15 routers).
• In the USG, you can configure two sets of RIP settings before you can use it in an interface.
• First, the
Authentication
field specifies how to verify that the routing information that is
received is the same routing information that is sent. This is discussed in more detail in
Authentication Types on page 248
• Second, the USG can also
redistribute
routing information from non-RIP networks, specifically
OSPF networks and static routes, to the RIP network. Costs might be calculated differently,
however, so you use the
Metric
field to specify the cost in RIP terms.
• RIP uses UDP port 520.
Table 95
RIP vs. OSPF
RIP
OSPF
Network Size
Small (with up to 15 routers) Large
Metric
Hop count
Bandwidth, hop count, throughput, round trip time and
reliability.
Convergence
Slow
Fast
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