3Com Switch 4500 26-Port Configuration Manual page 110

108 C 6: IP R
HAPTER OUTING
P O
ROTOCOL PERATION
The parameters are explained as follows:
IP address and mask
■
The IP address and mask use a decimal format. Because the 1s in the 32-bit
mask must be consecutive, the dotted decimal mask can also be replaced by
the mask-length which refers to the digits of the consecutive 1s in the mask.
Next hop address and NULL interface
■
When configuring a static route, you can specify the
decide the next hop address, depending on the actual conditions.
For all the routing items, the next hop address must be specified. When the IP
layer transmits a packet, it first searches the matching route in the routing
table, depending on the destination address of the packet. Only when the next
hop address of the route is specified can the link layer find the corresponding
link layer address, and then forward the packet.
The packets sent to the NULL interface, which is a virtual interface, are
discarded at once. This can decrease system load.
You cannot specify an interface address of the local Switch as the next hop
address of an static route.
Preference
■
For different configurations of
routing management policy.
Other parameters
■
The attributes
reject
blackhole route, respectively.
Configuring a Default Route
Perform the following configurations in System View.
Table 101 Configuring a default route
Operation Command
Configure a
ip route-static 0.0.0.0 { 0.0.0.0 | 0 } {
default route
interface_type interface_number | gateway_address } [
preference value ] [ reject | blackhole ]
Delete a default
undo ip route-static 0.0.0.0 { 0.0.0.0 | 0 } [
route
interface_type interface_number | gateway_address ] [
preference value ] [ reject | blackhole ]
The parameters for the default route are the same as those for the static route.
Deleting All The Static Routes
You can use the
undo ip route-static
Switch 4500 also provides the
delete all static routes at one time, including the default routes.
Perform the following configuration in System View.
Table 102 Deleting all static routes
Operation
Delete all static routes
preference_value
and indicate the unreachable route and the
blackhole
command to delete a static route. The
delete static-routes all
Command
delete static-routes all
to
gateway_address
, you can flexibly apply the
command for you to