Cisco Systems RJ-45-to-AUX Configuring a Default Route and Gateway, Viewing the Default Routes

sc0: flags=63<UP,BROADCAST,RUNNING>

vlan 1 inet 68.187.127.1 netmask 255.255.255.0 broadcast 68.187.127.1

Console> (enable)

Configuring a Default Route and Gateway

Data traffic not addressed to the local subnet or VLAN must be sent to a default route or destination. For redundancy purposes, a secondary default gateway can be configured if the primary gateway link is lost. The switch attempts to use the secondary gateways in the order they were configured, unless the syntax primary is used. The switch will send periodic pings to determine if each gateway has lost connectivity. If the primary gateway loses its link, it begins forwarding to the secondary default gateway. When connectivity to the primary gateway link is restored, the switch resumes sending traffic to the primary gateway.

You can define up to three default IP gateways. The first gateway configured becomes the primary default gateway. If multiple gateways are defined, the last primary gateway configured is the primary default gateway. You can also use the primary subcommand to make a certain IP address the defined primary default gateway. The rest become secondary in the event of a network problem, as shown here:

Console> (enable) set ip route default 68.187.127.1

Route added.

Console> (enable) set ip route default 68.187.127.2 primary

Route added.

Viewing the Default Routes

The following command allows you to see the default routes on both the Cisco IOS−based command−line interfaces:

Console> (enable) show ip route

Fragmentation	Redirect	Unreachable
—————————————	————————	———————————
enabled	enabled	enabled

The primary gateway: 68.187.127.1
Destination	Gateway	RouteMask	Flags	Use	Interface
———————————	———————	—————————	—————	—————	—————————
default	68.187.127.1	0x0	UG	100	sc0
default	68.187.127.2	0x0	G	0	sc0

Configuring Port Speed and Duplex

You can manually set 10Mbps and 100Mbps ports. Occasionally, you will find an interface that cannot autonegotiate the speed correctly. You can choose from three syntaxes:

∙10—10Mbps traffic only

∙100—100Mbps traffic only

∙auto—Autonegotiates the speed of the traffic on the port

Let’s take a look at some examples. To configure port 3 on module 2 to auto−negotiate, use the following command:

Console? (enable) set port speed 2/3 auto

Port 2/3 set to auto−sensing mode.

You can also enter multiple ports’ consecutive port numbers. The following example configures ports 1 through 8 on the same line card used in the previous example to 100Mbps:

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