Managing Configuration Sessions - Cisco CRS-1 - Carrier Routing System Router Getting Started Manual

Managing Configuration Sessions

From global configuration mode, you can place the router in a configuration submode, such as interface
Step 4
configuration mode or a protocol-specific configuration mode.
In the following example, the router enters interface configuration mode and the user selects a
packet-over-SONET(POS) interface for configuration. The command syntax is interface type
rack/slot/module/port.
RP/0/RP0/CPU0:router(config)# interface POS 0/2/0/4
RP/0/RP0/CPU0:router(config-if)#
The command mode prompt changes from "
configuration commands for the specified interface.
To exit interface configuration mode and return to global configuration mode, enter the exit command.
Step 5
To return to EXEC mode, enter the end command.
Managing Configuration Sessions
In the Cisco IOS XR software, the running (active) configuration can never be altered directly. All
configuration changes are entered into an inactive target configuration, which must be explicitly
committed to the running configuration. This two-stage process allows configuration changes to be
made, edited, and verified before the actual running state of the router is impacted. The following
sections describe the management options for configuration sessions:
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Figure 2-5
Figure 2-5
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
2-14
Stage 1: Enter Configuration Changes to the Nonactive Target Configuration, page 2-15
Stage 2: Commit Changes to the Running Configuration, page 2-15
Displaying Configuration Details with show Commands, page 2-16
Commit Options, page 2-18
Displaying Configuration Errors, page 2-19
Clearing All Changes to a Target Configuration, page 2-20
Ending a Configuration Session, page 2-21
Locking and Unlocking the Running Configuration During Configuration Sessions, page 2-22
illustrates the two-stage configuration process.
Two-Stage Configuration Process
target configuration
EXEC mode
by entering global
configuration mode.
Chapter 2
to
(config)"
Create the
Enter configuration
changes to the
nonactive target
configuration.
target configuration
to file, or load a file.
Cisco IOS XR Basic Configuration Management
and you can now enter
"(config-if)"
Stage 1:
"Commit" changes
running configuration.
Automatic Save
Save the
Startup configuration
Stage 2:
to the