Configuring A Static Route - 3Com Switch 4800G 24-Port Configuration Manual

252 C 26: S
HAPTER TATIC
Application
Environment of Static
Routing
Configuring a Static
Route
Configuration
Prerequisites
Configuration Procedure
R C
OUTING ONFIGURATION
Before configuring a static route, you need to know the following concepts:
1 Destination address and mask
In the ip route-static command, an IPv4 address is in dotted decimal format and
a mask can be either in dotted decimal format or in the form of mask length (the
digits of consecutive 1s in the mask).
2 Output interface and next hop address
While configuring a static route, you can specify either the output interface or the
next hop address depending on the specific occasion. The next hop address can
not be a local interface IP address; otherwise, the route configuration will not take
effect.
In fact, all the route entries must have a next hop address. When forwarding a
packet, a router first searches the routing table for the route to the destination
address of the packet. The system can find the corresponding link layer address
and forward the packet only after the next hop address is specified.
When specifying the output interface, note that:
If the output interface is a NULL 0 interface, there is no need to configure the
■
next hop address.
You are not recommended to specify a broadcast interface (such as VLAN
■
interface) as the output interface, because a broadcast interface may have
multiple next hops. If you have to do so, you must specify the corresponding
next hop for the output interface.
Other attributes
■
You can configure different preferences for different static routes so that route
management policies can be applied more flexibly. For example, specifying the
same preference for different routes to the same destination enables load sharing,
while specifying different preferences for these routes enables route backup.
Before configuring a static route, you need to configure the IP addresses for
related interfaces.
Follow these steps to configure a static route:
To do...
Enter system view
Use the command...
system-view
Remarks
-