3Com CoreBuilder 3500, Руководство по внедрению

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Key Guidelines for Implementing IP Routing 285
Enable IP Routing To enable IP routing, use the
ip routing
command on the
Administration Console or use the IP Configuration form in the Web
Management software. By default, IP routing is disabled on the system.
You can use the Routing Information Protocol (RIP) or the Open Shortest
Path First (OSPF) protocol to take advantage of routing capabilities. RIP is
discussed in this chapter; OSPF is discussed in Chapter 14.
Administering IP
Routing
Keep these points in mind while you administer the IP network:
■
Flush the ARP cache regularly if you set the age time to 0.
■
Set up a default route.
The system uses the default route to forward packets that do not
match any other routing table entry. You may want to use the default
route in place of routes to numerous destinations that all have the
same gateway IP address. If you do not use a default route, ICMP is
more likely to return an “address not found” error.
■
Before you can define static routes, you must define at least one IP
interface. See the section “Defining an IP Interface”for more
information. Remember the following guidelines:
■
Static routes remain in the routing table until you remove them or
the corresponding interface.
■
Static routes take precedence over dynamically learned routes to
the same destination.
■
Static routes are included in periodic RIP updates sent by your
system.