Crypto Conditional Debug Support
First Published: July 28, 2003
Last Updated: July 31, 2009
The Crypto Conditional Debug Support feature introduces three new command-line interfaces (CLIs) that allow users to debug an IP Security (IPSec) tunnel on the basis of predefined crypto conditions such as the peer IP address, connection-ID of a crypto engine, and security parameter index (SPI). By limiting debug messages to specific IPSec operations and reducing the amount of debug output, users can better troubleshoot a router with a large number of tunnels.
Finding Feature Information
For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Crypto Conditional Debug Support" section.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.
Contents
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Prerequisites for Crypto Conditional Debug Support
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Restrictions for Crypto Conditional Debug Support
•
Information About Crypto Conditional Debug Support
•
How to Enable Crypto Conditional Debug Support
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Configuration Examples for the Crypto Conditional Debug CLIs
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Additional References
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Feature Information for Crypto Conditional Debug Support
Prerequisites for Crypto Conditional Debug Support
To use the new crypto CLIs, you must be using a crypto image, such as the k8 or k9 subsystem.
Restrictions for Crypto Conditional Debug Support
•
This feature does not support debug message filtering for hardware crypto engines.
•
Although conditional debugging is useful for troubleshooting peer-specific or functionality related Internet Key Exchange (IKE) and IPSec problems, conditional debugging may not be able to define and check large numbers of debug conditions.
Because extra space is needed to store the debug condition values, additional processing overhead is added to the CPU and memory usage is increased. Thus, enabling crypto conditional debugging on a router with heavy traffic should be used with caution.
Information About Crypto Conditional Debug Support
To enable the conditional crypto debug commands, you should understand the following concept:
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Supported Condition Types
Supported Condition Types
The new crypto conditional debug CLIs—debug crypto condition, debug crypto condition unmatched, and show crypto debug-condition—allow you to specify conditions (filter values) in which to generate and display debug messages related only to the specified conditions. Table 1 lists the supported condition types.
Table 1 Supported Condition Types for Crypto Debug CLI
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connid1 |
An integer between 1-32766. Relevant debug messages will be shown if the current IPSec operation uses this value as the connection ID to interface with the crypto engine. |
flowid1 |
An integer between 1-32766. Relevant debug messages will be shown if the current IPSec operation uses this value as the flow-ID to interface with the crypto engine. |
FVRF |
The name string of a virtual private network (VPN) routing and forwarding (VRF) instance. Relevant debug messages will be shown if the current IPSec operation uses this VRF instance as its front-door VRF (FVRF). |
IVRF |
The name string of a VRF instance. Relevant debug messages will be shown if the current IPSec operation uses this VRF instance as its inside VRF (IVRF). |
peer group |
A Unity group-name string. Relevant debug messages will be shown if the peer is using this group name as its identity. |
peer hostname |
A fully qualified domain name (FQDN) string. Relevant debug messages will be shown if the peer is using this string as its identity; for example, if the peer is enabling IKE Xauth with this FQDN string. |
peer ipaddress |
A single IP address. Relevant debug messages will be shown if the current IPSec operation is related to the IP address of this peer. |
peer subnet |
A subnet and a subnet mask that specify a range of peer IP addresses. Relevant debug messages will be shown if the IP address of the current IPSec peer falls into the specified subnet range. |
peer username |
A username string. Relevant debug messages will be shown if the peer is using this username as its identity; for example, if the peer is enabling IKE Extended Authentication (Xauth) with this username. |
SPI1 |
A 32-bit unsigned integer. Relevant debug messages will be shown if the current IPSec operation uses this value as the SPI. |
How to Enable Crypto Conditional Debug Support
This section contains the following procedures:
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Enabling Crypto Conditional Debug Messages
•
Enabling Crypto Error Debug Messages
Enabling Crypto Conditional Debug Messages
To enable crypto conditional debug filtering, you must perform the following tasks.
Performance Considerations
•
Before enabling crypto conditional debugging, you must decide what debug condition types (also known as debug filters) and values will be used. The volume of debug messages is dependent on the number of conditions you define.
Note
Specifying numerous debug conditions may consume CPU cycles and negatively affect router performance.
•
Your router will perform conditional debugging only after at least one of the global crypto debug commands—debug crypto isakmp, debug crypto ipsec, and debug crypto engine—has been enabled. This requirement helps to ensure that the performance of the router will not be impacted when conditional debugging is not being used.
Disable Crypto Debug Conditions
If you choose to disable crypto conditional debugging, you must first disable any crypto global debug CLIs you have issued; thereafter, you can disable conditional debugging.
Note
The reset keyword can be used to disable all configured conditions at one time.
SUMMARY STEPS
1.
enable
2.
debug crypto condition [connid integer engine-id integer] [flowid integer engine-id integer] [fvrf string] [ivrf string] [peer [group string] [hostname string] [ipv4 ipaddress] [subnet subnet mask] [username string]] [spi integer] [reset]
3.
show crypto debug-condition {[peer] [connid] [spi] [fvrf] [ivrf] [unmatched]}
4.
debug crypto isakmp
5.
debug crypto ipsec
6.
debug crypto engine
7.
debug crypto condition unmatched [isakmp | ipsec | engine] (optional)
DETAILED STEPS
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|
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Step 1 |
enable
Router> enable |
Enables privileged EXEC mode. • Enter your password if prompted. |
Step 2 |
debug crypto condition [connid integer engine-id integer] [flowid integer engine-id integer] [fvrf string] [ivrf string] [peer [group string] [hostname string] [ipv4 ipaddress] [subnet subnet mask] [username string]] [spi integer] [reset]
Router# debug crypto condition connid 2000 engine-id 1 |
Defines conditional debug filters. |
Step 3 |
show crypto debug-condition {[peer] [connid] [spi] [fvrf] [ivrf] [unmatched]}
Router# show crypto debug-condition spi |
Displays crypto debug conditions that have already been enabled in the router. |
Step 4 |
debug crypto isakmp
Router# debug crypto isakmp |
Enables global IKE debugging. |
Step 5 |
debug crypto ipsec
Router# debug crypto ipsec |
Enables global IPSec debugging. |
Step 6 |
debug crypto engine
Router# debug crypto engine |
Enables global crypto engine debugging. |
Step 7 |
debug crypto condition unmatched [isakmp | ipsec | engine]
Router# debug crypto condition unmatched ipsec |
(Optional) Displays debug conditional crypto messages when no context information is available to check against debug conditions. If none of the optional keywords are specified, all crypto-related information will be shown. |
Enabling Crypto Error Debug Messages
To enable crypto error debug messages, you must perform the following tasks.
debug crypto error CLI
Enabling the debug crypto error command displays only error-related debug messages, thereby, allowing you to easily determine why a crypto operation, such as an IKE negotiation, has failed within your system.
Note
When enabling this command, ensure that global crypto debug commands are not enabled; otherwise, the global commands will override any possible error-related debug messages.
SUMMARY STEPS
1.
enable
2.
debug crypto {isakmp | ipsec | engine} error
DETAILED STEPS
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|
|
Step 1 |
enable
Router> enable |
Enables privileged EXEC mode. • Enter your password if prompted. |
Step 2 |
debug crypto {isakmp | ipsec | engine} error
Router# debug crypto ipsec error |
Enables only error debugging messages for a crypto area. |
Configuration Examples for the Crypto Conditional Debug CLIs
This section includes the following examples:
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Enabling Crypto Conditional Debugging: Example
•
Disabling Crypto Conditional Debugging: Example
Enabling Crypto Conditional Debugging: Example
The following example shows how to display debug messages when the peer IP address is 10.1.1.1, 10.1.1.2, or 10.1.1.3, and when the connection-ID 2000 of crypto engine 0 is used. This example also shows how to enable global debug crypto CLIs and enable the show crypto debug-condition command to verify conditional settings.
Router#
debug crypto condition connid 2000 engine-id 1
Router#
debug crypto condition peer ipv4 10.1.1.1
Router#
debug crypto condition peer ipv4 10.1.1.2
Router#
debug crypto condition peer ipv4 10.1.1.3
Router#
debug crypto condition unmatched
! Verify crypto conditional settings.
Router#
show crypto debug-condition
Crypto conditional debug currently is turned ON
IKE debug context unmatched flag:ON
IPsec debug context unmatched flag:ON
Crypto Engine debug context unmatched flag:ON
IKE peer IP address filters:
10.1.1.1 10.1.1.2 10.1.1.3
Connection-id filters:[connid:engine_id]2000:1,
! Enable global crypto CLIs to start conditional debugging.
Router#
debug crypto isakmp
Router#
debug crypto ipsec
Router#
debug crypto engine
Disabling Crypto Conditional Debugging: Example
The following example shows how to disable all crypto conditional settings and verify that those settings have been disabled:
Router#
debug crypto condition reset
! Verify that all crypto conditional settings have been disabled.
Router#
show crypto debug-condition
Crypto conditional debug currently is turned OFF
IKE debug context unmatched flag:OFF
IPsec debug context unmatched flag:OFF
Crypto Engine debug context unmatched flag:OFF
Additional References
The following sections provide references to the Crypto Conditional Debug Support feature.
Related Documents
Standards
MIBs
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None |
To locate and download MIBs for selected platforms, Cisco IOS XE releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs |
RFCs
Technical Assistance
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The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. |
http://www.cisco.com/techsupport |
Feature Information for Crypto Conditional Debug Support
Table 2 lists the release history for this feature.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.
Note
Table 2 lists only the Cisco IOS XE software release that introduced support for a given feature in a given Cisco IOS XE software release train. Unless noted otherwise, subsequent releases of that Cisco IOS XE software release train also support that feature.
Table 2 Feature Information for Crypto Conditional Debug Support
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Crypto Conditional Debug Support |
Cisco IOS XE Release 2.1 |
The Crypto Conditional Debug Support feature introduces three new command-line interfaces (CLIs) that allow users to debug an IP Security (IPSec) tunnel on the basis of predefined crypto conditions such as the peer IP address, connection-ID of a crypto engine, and security parameter index (SPI). |
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