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68 CHAPTER 5: IP ROUTING PROTOCOL OPERATION
entry of the routing table, the router selects the default route to forward this
packet. If there is no default route and the destination address of the packet fails
to match any entry in the routing table, the packet is discarded, and an Internet
Control Message Protocol (ICMP) packet is sent to the originating host to indicate
that the destination host or network is unreachable.
In a typical network that consists of hundreds of routers, if you used multiple
dynamic routing protocols without configuring a default route then significant
bandwidth would be consumed. Using the default route can provide appropriate
bandwidth, but not high bandwidth, for communications between large numbers
of users.
Configuring Static Routes is described in the following sections:
■ Configuring Static Routes
■ Troubleshooting Static Routes
Configuring Static
Routes
Static route configuration tasks are described in the following sections:
■ Configuring a Static Route
■ Configuring a Default Route
■ Deleting All Static Routes
■ Displaying and Debugging Static Routes
Configuring a Static Route
Perform the following configurations in system view.
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.
■ Transmitting interface or next hop address
When you configure a static route, you can specify either the interface-type
port-number to designate a transmitting interface, or the gateway-address to
decide the next hop address, depending on the actual conditions.
You can specify the transmitting interfaces in the cases below:
■ For the interface that supports resolution from the network address to the link
layer address (such as the Ethernet interface that supports ARP), when
ip-address and mask (or mask-length) specifies a host address, and this
Table 2 Configuring a Static Route
Operation Command
Add a static route ip route-static ip-address {mask |
mask-length } { interface-name |
gateway-address } [ preference value ] [
reject | blackhole ]
Delete a static route undo ip route-static ip-address {mask |
mask-length } { interface-name |
gateway-address} [ preference value ]