This module describes how to implement keychain management on. Keychain management is a common method of authentication to configure shared secrets on all entities that exchange secrets such as keys, before establishing trust with each other. Routing protocols and network management applications on Cisco IOS XR software often use authentication to enhance security while communicating with peers.
Feature History for Implementing Keychain Management
This feature was introduced.
Support for the MAC authentication algorithm was added.
Support for hitless key rollover and key acceptance tolerance were added.
Support for hitless key rollover for Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS) was added.
You must be in a user group associated with a task group that includes the proper task IDs. The command reference guides include the task IDs required for each command. If you suspect user group assignment is preventing you from using a command, contact your AAA administrator for assistance.
Restrictions for Implementing Keychain Management
You must be aware that changing the system clock impacts the validity of the keys in the existing configuration.
Information About Implementing Keychain Management
The keychain by itself has no relevance; therefore, it must be used by an application that needs to communicate by using the keys (for authentication) with its peers. The keychain provides a secure mechanism to handle the keys and rollover based on the lifetime. Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), and Intermediate System-to-Intermediate System (IS-IS) use the keychain to implement a hitless key rollover for authentication. BGP uses TCP authentication, which enables the authentication option and sends the Message Authentication Code (MAC) based on the cryptographic algorithm configured for the keychain. For information about BGP, OSPF, and IS-IS keychain configurations, seeCisco IOS XR Routing Configuration Guide for the Cisco CRS Router
To implement keychain management, you must understand the concept of key lifetime, which is explained in the next section.
If you are using keys as the security method, you must specify the lifetime for the keys and change the keys on a regular basis when they expire. To maintain stability, each party must be able to store and use more than one key for an application at the same time. A keychain is a sequence of keys that are collectively managed for authenticating the same peer, peer group, or both.
Keychain management groups a sequence of keys together under a keychain and associates each key in the keychain with a lifetime.
Any key that is configured without a lifetime is considered invalid; therefore, the key is rejected during configuration.
The lifetime of a key is defined by the following options:
Start-time—Specifies the absolute time.
End-time—Specifies the absolute time that is relative to the start-time or infinite time.
Each key definition within the keychain must specify a time interval for which that key is activated; for example, lifetime. Then, during a given key's lifetime, routing update packets are sent with this activated key. Keys cannot be used during time periods for which they are not activated. Therefore, we recommend that for a given keychain, key activation times overlap to avoid any period of time for which no key is activated. If a time period occurs during which no key is activated, neighbor authentication cannot occur; therefore, routing updates can fail.
Configuring only the keychain name without any key identifiers is considered a nonoperation. When you exit the configuration, the router does not prompt you to commit changes until you have configured the key identifier and at least one of the global configuration mode attributes or keychain-key configuration mode attributes (for example, lifetime or key string).
Use one of these commands:
Saves configuration changes.
When you issue the end command, the system prompts you to commit changes:
Uncommitted changes found, commit them
before exiting(yes/no/cancel)? [cancel]:
Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.
Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.
Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.
Use the commit command to save the configuration changes to the running configuration file, and remain within the configuration session.
show key chainkey-chain-name
RP/0/RP0/CPU0:router# show key chain isis-keys
(Optional) Displays the name of the keychain.
The key-chain-name argument is optional. If you do not specify a name for the key-chain-name argument, all the keychains are displayed.
No new or modified RFCs are supported by this feature.
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