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Performing the Initial Configuration on the Router
Examples
Configuring the GigabitEthernet Interface: Example
!
interface GigabitEthernet0/0
description GE int to HR group
ip address 172.16.3.3 255.255.255.0
duplex auto
speed auto
no shutdown
!
Sample Output for the show ip interface brief Command
Router# show ip interface brief
Interface
GigabitEthernet0/0
GigabitEthernet0/1
Router#
Specifying a Default Route or Gateway of Last Resort
This section describes how to specify a default route with IP routing enabled. For alternative methods of
specifying a default route, see
The Cisco IOS software uses the gateway (router) of last resort if it does not have a better route for a
packet and if the destination is not a connected network. This section describes how to select a network
as a default route (a candidate route for computing the gateway of last resort). The way in which routing
protocols propagate the default route information varies for each protocol.
Configuring IP Routing and IP Protocols
For comprehensive configuration information about IP routing and IP routing protocols, see
IP Routing Protocols Configuration Guide, Release 12.4T
IP Routing
You can configure integrated routing and bridging (IRB) so the router can route and bridge
simultaneously. The router acts as an IP host on the network whether routing is enabled or not.
To read more about IRB, see the following URL:
http://www.cisco.com/en/US/tech/tk389/tk815/tk855/tsd_technology_support_sub-protocol_home.htm
l
IP routing is automatically enabled in the Cisco IOS software. When IP routing is configured, the system
uses a configured or learned route to forward packets, including a configured default route.
Note
This task section does not apply when IP routing is disabled. To specify a default route when IP routing
is disabled, see
Cisco Connected Grid Routers 2010 Hardware Installation Guide
4-14
IP-Address
172.16.3.3
unassigned
Configuring a Gateway of Last Resort Using IP
Configuring a Gateway of Last Resort Using IP Commands
Chapter 4
OK? Method Status
YES NVRAM
up
YES NVRAM
administratively down down
on www.cisco.com.
Configuring the Router
Protocol
up
Commands.
Cisco IOS
on www.cisco.com.
OL-21559-01
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