ZyXEL Communications ZyWALL 1000 User Manual
ZyWALL USG 1000 User’s Guide
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H A P T E R
13
Routing Protocols
This chapter describes how to set up RIP and OSPF routing protocol settings for the
ZyWALL. First, it provides an overview of RIP and OSPF, and, then, it introduces the RIP and
OSPF screens used to configure routing protocols. See
ZyWALL. First, it provides an overview of RIP and OSPF, and, then, it introduces the RIP and
OSPF screens used to configure routing protocols. See
for related
information on these screens.
13.1 Routing Protocols Overview
Routing protocols give the ZyWALL routing information about the network from other
routers. The ZyWALL then stores this routing information in the routing table, which it uses
when it makes routing decisions. In turn, the ZyWALL can also provide routing information
via routing protocols to other routers.
The ZyWALL supports two standards, RIP and OSPF, for routing protocols. RIP and OSPF
are compared in
routers. The ZyWALL then stores this routing information in the routing table, which it uses
when it makes routing decisions. In turn, the ZyWALL can also provide routing information
via routing protocols to other routers.
The ZyWALL supports two standards, RIP and OSPF, for routing protocols. RIP and OSPF
are compared in
, and they are discussed further in the next two sections.
13.1.1 RIP Overview
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 ZyWALL, 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
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 ZyWALL, 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
Second, the ZyWALL 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.
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.
Table 70 OSPF vs. RIP
OSPF
RIP
Network Size
Large
Small (with up to 15 routers)
Metric
Bandwidth, hop count, throughput, round
trip time and reliability.
Hop count
Convergence
Fast
Slow