Use Of The Interface Preconfigure Command; Active And Standby Rps And Virtual Interface Configuration - Cisco 6000 Series Configuration Manual

Preconfiguring Physical Interfaces
Another advantage of performing a preconfiguration is that during a card replacement, when the modular
services card is removed, you can still see the previous configuration and make modifications.

Use of the Interface Preconfigure Command

Interfaces that are not yet present in the system can be preconfigured with the interface preconfigure command
in XR configuration mode.
The interface preconfigure command places the router in interface configuration mode. Users should be able
to add any possible interface commands. The verifiers registered for the preconfigured interfaces verify the
configuration. The preconfiguration is complete when the user enters the end command, or any matching exit
or XR configuration mode command.
Note
It is possible that some configurations cannot be verified until the modular services card is inserted.
Note Do not enter the no shutdown command for new preconfigured interfaces, because the no form of this
command removes the existing configuration, and there is no existing configuration.
Users are expected to provide names during preconfiguration that will match the name of the interface that
will be created. If the interface names do not match, the preconfiguration cannot be applied when the interface
is created. The interface names must begin with the interface type that is supported by the router and for which
drivers have been installed. However, the slot, port, subinterface number, and channel interface number
information cannot be validated.
Note Specifying an interface name that already exists and is configured (or an abbreviated name like e0/3/0/0) is
not permitted.

Active and Standby RPs and Virtual Interface Configuration

The standby RP is available and in a state in which it can take over the work from the active RP should that
prove necessary. Conditions that necessitate the standby RP to become the active RP and assume the active
RP 's duties include:
• Failure detection by a watchdog
• Standby RP is administratively commanded to take over
• Removal of the active RP from the chassis
If a second RP is not present in the chassis while the first is in operation, a second RP may be inserted and
will automatically become the standby RP . The standby RP may also be removed from the chassis with no
effect on the system other than loss of RP redundancy.
After switchover , the virtual interfaces will all be present on the standby (now active) . Their state and
configuration will be unchanged, and there will have been no loss of forwarding (in the case of tunnels) over
the interfaces during the switchover . The Cisco NCS 6000 Series Router uses nonstop forwarding (NSF)
over tunnels through the switchover of the host RP .
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
Use of the Interface Preconfigure Command
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